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• How do you re-mount an ext3 fs readwrite after it gets mounted readonly from a disk error?

  - by cagenut

  Its a relatively common problem when something goes wrong in a SAN for ext3 to detect the disk write errors and remount the filesystem read-only. Thats all well and good, only when the SAN is fixed I can't figure out how to re-re-mount the filesystem read-write without rebooting. Behold: [root@localhost ~]# multipath -ll mpath0 (36001f93000a310000299000200000000) dm-2 XIOTECH,ISE1400 [size=1.1T][features=1 queue_if_no_path][hwhandler=0][rw] \_ round-robin 0 [prio=2][active] \_ 1:0:0:1 sdb 8:16 [active][ready] \_ 2:0:0:1 sdc 8:32 [active][ready] [root@localhost ~]# mount /dev/mapper/mpath0 /mnt/foo [root@localhost ~]# touch /mnt/foo/blah All good, now I yank the LUN out from under it. [root@localhost ~]# touch /mnt/foo/blah [root@localhost ~]# touch /mnt/foo/blah touch: cannot touch `/mnt/foo/blah': Read-only file system [root@localhost ~]# tail /var/log/messages Mar 18 13:17:33 localhost multipathd: sdb: tur checker reports path is down Mar 18 13:17:34 localhost multipathd: sdc: tur checker reports path is down Mar 18 13:17:35 localhost kernel: Aborting journal on device dm-2. Mar 18 13:17:35 localhost kernel: Buffer I/O error on device dm-2, logical block 1545 Mar 18 13:17:35 localhost kernel: lost page write due to I/O error on dm-2 Mar 18 13:17:36 localhost kernel: ext3_abort called. Mar 18 13:17:36 localhost kernel: EXT3-fs error (device dm-2): ext3_journal_start_sb: Detected aborted journal Mar 18 13:17:36 localhost kernel: Remounting filesystem read-only It only thinks its read-only, in reality its not even there. [root@localhost ~]# multipath -ll sdb: checker msg is "tur checker reports path is down" sdc: checker msg is "tur checker reports path is down" mpath0 (36001f93000a310000299000200000000) dm-2 XIOTECH,ISE1400 [size=1.1T][features=0][hwhandler=0][rw] \_ round-robin 0 [prio=0][enabled] \_ 1:0:0:1 sdb 8:16 [failed][faulty] \_ 2:0:0:1 sdc 8:32 [failed][faulty] [root@localhost ~]# ll /mnt/foo/ ls: reading directory /mnt/foo/: Input/output error total 20 -rw-r--r-- 1 root root 0 Mar 18 13:11 bar How it still remembers that 'bar' file being there... mystery, but not important right now. Now I re-present the LUN: [root@localhost ~]# tail /var/log/messages Mar 18 13:23:58 localhost multipathd: sdb: tur checker reports path is up Mar 18 13:23:58 localhost multipathd: 8:16: reinstated Mar 18 13:23:58 localhost multipathd: mpath0: queue_if_no_path enabled Mar 18 13:23:58 localhost multipathd: mpath0: Recovered to normal mode Mar 18 13:23:58 localhost multipathd: mpath0: remaining active paths: 1 Mar 18 13:23:58 localhost multipathd: dm-2: add map (uevent) Mar 18 13:23:58 localhost multipathd: dm-2: devmap already registered Mar 18 13:23:59 localhost multipathd: sdc: tur checker reports path is up Mar 18 13:23:59 localhost multipathd: 8:32: reinstated Mar 18 13:23:59 localhost multipathd: mpath0: remaining active paths: 2 Mar 18 13:23:59 localhost multipathd: dm-2: add map (uevent) Mar 18 13:23:59 localhost multipathd: dm-2: devmap already registered [root@localhost ~]# multipath -ll mpath0 (36001f93000a310000299000200000000) dm-2 XIOTECH,ISE1400 [size=1.1T][features=1 queue_if_no_path][hwhandler=0][rw] \_ round-robin 0 [prio=2][enabled] \_ 1:0:0:1 sdb 8:16 [active][ready] \_ 2:0:0:1 sdc 8:32 [active][ready] Great right? It says [rw] right there. Not so fast: [root@localhost ~]# touch /mnt/foo/blah touch: cannot touch `/mnt/foo/blah': Read-only file system OK, doesn't do it automatically, I'll just give it a little push: [root@localhost ~]# mount -o remount /mnt/foo mount: block device /dev/mapper/mpath0 is write-protected, mounting read-only The hell you are: [root@localhost ~]# mount -o remount,rw /mnt/foo mount: block device /dev/mapper/mpath0 is write-protected, mounting read-only Noooooooooo. I have tried all sorts of different mount/tune2fs/dmsetup commands and I cannot figure out how to get it to un-flag the block device as write-protected. Rebooting will fix it, but I'd much rather do it on-line. An hour of googling has gotten me nowhere either. Save me ServerFault.

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• Developer’s Life – Attitude and Communication – They Can Cause Problems – Notes from the Field #027

  - by Pinal Dave

  [Note from Pinal]: This is a 27th episode of Notes from the Field series. The biggest challenge for anyone is to understand human nature. We human have so many things on our mind at any moment of time. There are cases when what we say is not what we mean and there are cases where what we mean we do not say. We do say and things as per our mood and our agenda in mind. Sometimes there are incidents when our attitude creates confusion in the communication and we end up creating a situation which is absolutely not warranted. In this episode of the Notes from the Field series database expert Mike Walsh explains a very crucial issue we face in our career, which is not technical but more to relate to human nature. Read on this may be the best blog post you might read in recent times. In this week’s note from the field, I’m taking a slight departure from technical knowledge and concepts explained. We’ll be back to it next week, I’m sure. Pinal wanted us to explain some of the issues we bump into and how we see some of our customers arrive at problem situations and how we have helped get them back on the right track. Often it is a technical problem we are officially solving – but in a lot of cases as a consultant, we are really helping fix some communication difficulties. This is a technical blog post and not an “advice column” in a newspaper – but the longer I am a consultant, the more years I add to my experience in technology the more I learn that the vast majority of the problems we encounter have “soft skills” included in the chain of causes for the issue we are helping overcome. This is not going to be exhaustive but I hope that sharing four pieces of advice inspired by real issues starts a process of searching for places where we can be the cause of these challenges and look at fixing them in ourselves. Or perhaps we can begin looking at resolving them in teams that we manage. I’ll share three statements that I’ve either heard, read or said and talk about some of the communication or attitude challenges highlighted by the statement. 1 – “But that’s the SAN Administrator’s responsibility…” I heard that early on in my consulting career when talking with a customer who had serious corruption and no good recent backups – potentially no good backups at all. The statement doesn’t have to be this one exactly, but the attitude here is an attitude of “my job stops here, and I don’t care about the intent or principle of why I’m here.” It’s also a situation of having the attitude that as long as there is someone else to blame, I’m fine…  You see in this case, the DBA had a suspicion that the backups were not being handled right.  They were the DBA and they knew that they had responsibility to ensure SQL backups were good to go – it’s a basic requirement of a production DBA. In my “As A DBA Where Do I start?!” presentation, I argue that is job #1 of a DBA. But in this case, the thought was that there was someone else to blame. Rather than create extra work and take on responsibility it was decided to just let it be another team’s responsibility. This failed the company, the company’s customers and no one won. As technologists – we should strive to go the extra mile. If there is a lack of clarity around roles and responsibilities and we know it – we should push to get it resolved. Especially as the DBAs who should act as the advocates of the data contained in the databases we are responsible for. 2 – “We’ve always done it this way, it’s never caused a problem before!” Complacency. I have to say that many failures I’ve been paid good money to help recover from would have not happened had it been for an attitude of complacency. If any thoughts like this have entered your mind about your situation you may be suffering from it. If, while reading this, you get this sinking feeling in your stomach about that one thing you know should be fixed but haven’t done it.. Why don’t you stop and go fix it then come back.. “We should have better backups, but we’re on a SAN so we should be fine really.” “Technically speaking that could happen, but what are the chances?” “We’ll just clean that up as a fast follow” ..and so on. In the age of tightening IT budgets, increased expectations of up time, availability and performance there is no room for complacency. Our customers and business units expect – no demand – the best. Complacency says “we will give you second best or hopefully good enough and we accept the risk and know this may hurt us later. Sometimes an organization will opt for “good enough” and I agree with the concept that at times the perfect can be the enemy of the good. But when we make those decisions in a vacuum and are not reporting them up and discussing them as an organization that is different. That is us unilaterally choosing to do something less than the best and purposefully playing a game of chance. 3 – “This device must accept interference from other devices but not create any” I’ve paraphrased this one – but it’s something the Federal Communications Commission – a federal agency in the United States that regulates electronic communication – requires of all manufacturers of any device that could cause or receive interference electronically. I blogged in depth about this here (http://www.straightpathsql.com/archives/2011/07/relationship-advice-from-the-fcc/) so I won’t go into much detail other than to say this… If we all operated more on the premise that we should do our best to not be the cause of conflict, and to be less easily offended and less upset when we perceive offense life would be easier in many areas! This doesn’t always cause the issues we are called in to help out. Not directly. But where we see it is in unhealthy relationships between the various technology teams at a client. We’ll see teams hoarding knowledge, not sharing well with others and almost working against other teams instead of working with them. If you trace these problems back far enough it often stems from someone or some group of people violating this principle from the FCC. To Sum It Up Technology problems are easy to solve. At Linchpin People we help many customers get past the toughest technological challenge – and at the end of the day it is really just a repeatable process of pattern based troubleshooting, logical thinking and starting at the beginning and carefully stepping through to the end. It’s easy at the end of the day. The tough part of what we do as consultants is the people skills. Being able to help get teams working together, being able to help teams take responsibility, to improve team to team communication? That is the difficult part, and we get to use the soft skills on every engagement. Work on professional development (http://professionaldevelopment.sqlpass.org/) and see continuing improvement here, not just with technology. I can teach just about anyone how to be an excellent DBA and performance tuner, but some of these soft skills are much more difficult to teach. If you want to get started with performance analytics and triage of virtualized SQL Servers with the help of experts, read more over at Fix Your SQL Server. Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: Notes from the Field, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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• Underwriting in a New Frontier: Spurring Innovation

  - by [email protected]

  Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";} Susan Keuer, product strategy manager for Oracle Insurance, shares her experiences and insight from the 2010 Association of Home Office Underwriters (AHOU) Annual Conference, April 11-14, in San Antonio, Texas    How can I be more innovative in underwriting?  It's a common question I hear from insurance carriers, producers and others, so it was no surprise that it was the key theme at the recent 2010 AHOU Annual Conference.  This year's event drew more than 900 insurance professionals involved in the underwriting process across life and annuities, property and casualty and reinsurance from around the globe, including the U.S., Canada, Australia, Bahamas, and more, to San Antonio - a Texas city where innovation transformed a series of downtown drainage canals into its premiere River Walk tourist destination.   CNN's Medical Correspondent Dr. Sanjay Gupta kicked off the conference with a phenomenal opening session that drove home the theme of the conference, "Underwriting in a New Frontier:  Spurring Innovation."   Drawing from his own experience as a neurosurgeon treating critically injured medical patients in the field in Iraq, Gupta inspired audience members to think outside the box during the underwriting process. He shared a compelling story of operating on a soldier who had suffered a head-related trauma in a field hospital.  With minimal supplies available Gupta used a Black and Decker saw to operate on the soldier's head and reduce pressure on his swelling brain. Drawing from this example, Gupta encouraged underwriters to think creatively, be innovative, and consider new tools and sources of information, such as social networking sites, during the underwriting process. So as you are looking at risk take into consideration all resources you have available.    Gupta also stressed the concept of IKIGAI - noting that individuals who believe that their life is worth living are less likely to die than are their counterparts without this belief.  How does one quantify this approach to life or thought process when evaluating risk?  Could this be something to consider as a "category" in the near future? How can this same belief in your own work spur innovation?   The role of technology was a hot topic of discussion throughout the conference.  Sessions delved into the latest in underwriting software to the rise of social media and how it is being increasingly integrated into underwriting process and solutions.  In one session a trio of panelists representing the carrier, producer and vendor communities stressed the importance to underwriters of leveraging new technology and the plethora of online information sources, which all could be used to accurately, honestly and consistently evaluate the risk throughout the underwriting process.   Another focused on the explosion of social media noting:  1.    Social media is growing exponentially - About eight percent of Americans used social media five years ago. Today about 46 percent of Americans do so, with 85 percent of financial services professionals using social media in their work.  2.    It will impact your business - Underwriters reconfirmed over and over that they are increasingly using "free" tools that are available in cyberspace in lieu of more costly solutions, such as inspection reports conducted by individuals in the field.  3.    Information is instantly available on the Web, anytime, anywhere - LinkedIn was mentioned as a way to connect to peers in the underwriting community and producers alike.  Many carriers and agents also are using Facebook to promote their company to customers - and as a point-of-entry to allow them to perform some functionality - such as accessing product marketing information versus directing users to go to the carrier's own proprietary website.  Other carriers have released their tight brand marketing to allow their producers to drive more business to their personal Facebook site where they offer innovative tools such as Application Capture or asking medical information in a more relaxed fashion.     Other key topics at the conference included the economy, ongoing industry consolidation, real-estate valuations as an asset and input into the underwriting process, and producer trends.  All stressed a "back to basics" approach for low cost, term products.   Finally, Connie Merritt, RN, PHN, entertained the large group of atttendees with audience-engaging insight on how to "Tame the Lions in Your Life - Dealing with Complainers, Bullies, Grump and Curmudgeon." Merritt noted "we are too busy for our own good." She shared how her overachieving personality had impacted her life.  Audience members then were asked to pick red, yellow, blue, or green shapes, without knowing that each one represented a specific personality trait.  For example, those who picked blue were the peacemakers. Those who choose yellow were social - the hint was to "Be Quiet Longer."  She then offered these "lion taming" steps:   1.    Admit It 2.    Accept It 3.    Let Go 4.    Be Present (which paralleled Gupta's IKIGAI concept)   When thinking about underwriting I encourage you to be present in the moment and think creatively, but don't be afraid to look ahead to the future and be an innovator.  I hope to see you at next year's AHOU Annual Conference, May 1-4, 2011 at The Mirage in Las Vegas, Nev.     Susan Keuer is the product strategy manager for new business underwriting.  She brings more than 20 years of insurance industry experience working with leading insurance carriers and technology companies to her role on the product strategy team for life/annuities solutions within the Oracle Insurance Global Business Unit  

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• April Oracle Database Events

  - by Mandy Ho

  Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";} April 17-18, 2012 – Moscow, Russia Oracle Develop Conference The Oracle database developer conference, Oracle Develop, will visit Moscow, Russia and Hyderabad, India this spring. Oracle Develop includes a database development track, which contains .NET sessions and hands-on lab led by an Oracle .NET product manager. Register today before the event fills up. http://www.oracle.com/javaone/ru-en/index.html Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";} April 24, 26 – San Diego, CA & San Jose, CA ISC2 Leadership Regional Event Series Oracle at (ISC)2 Security Leadership Series: Herding Clouds -- Managing Cloud Security Concerns and Expectations Join us for his interactive day-long session where industry leaders, including Oracle solution experts, will talk about how to: dispel the top Cloud security myths minimize "rogue Cloud" implementations identify potential compliance pitfalls and how to avoid them develop contract language for your cloud providers manage users across your fractured datacenter leverage existing technologies to protect data as it moves from the enterprise to the cloud http://www.oracle.com/webapps/events/ns/EventsDetail.jsp?p_eventId=146972&src=7239493&src=7239493&Act=228 Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";} April 22-26, 2012 – Las Vegas, NV IOUG Collaborate 12 From April 22-26, 2012, Oracle takes Las Vegas. Thousands of Oracle professionals will descend upon the Mandalay Bay Convention Center for a weeks worth of education sessions, networking opportunities and more, at the only user-driven and user-run Oracle conference - COLLABORATE 12.  Your COLLABORATE 12 - IOUG Forum registration comes complete with a bonus- a full day Deep Dive education program on Sunday! Choose from numerous hot topics, including Real World Performance, High Availability and more, presented by legendary and seasoned Oracle pros, including Tom Kyte and Craig Shallahamer. http://www.oracle.com/webapps/events/ns/EventsDetail.jsp?p_eventId=143637&src=7360364&src=7360364&Act=5 Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";} Independent Oracle User Group (IOUG) Regional Events: April 16, 2012 – Columbus, Ohio Ohio Oracle Users Group Higher Performance PL/PQL and Oracle Database 11g PL/SQL New Features – Featuring Steven Feuerstein http://www.ooug.org/ Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";} Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";} April 26, 2012- Irving, TX Dallas Oracle Users Group Oracle Database Forum: 5-7PM Oracle Corporation, 6031 Connection Drive Irving, TX http://memberservices.membee.com/538/irmevents.aspx?id=64 Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";} Apr 30, 2012- Los Angeles, CA Real World Performance Tour A full day of real world database performance with: Tom Kyte, author of the ever popular AskTom Blog, Andrew Holdsworth, head of Oracle's Real World Performance Team, and Graham Wood, renowned Oracle Database performance architect. Through discussion, debate and demos, they’ll show you how to master performance engineering topics like: Best practices for designing hardware architectures and how to spot and fix bad design. How to develop applications that deliver the fastest possible performance without sacrificing accuracy.  New for 2012! Updates on Enterprise Manager, Exadata, and what these technologies mean to your current systems. http://www.ioug.org/Events/ADayofRealWorldPerformance/tabid/194/Default.aspx

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• The SPARC SuperCluster

  - by Karoly Vegh

  Oracle has been providing a lead in the Engineered Systems business for quite a while now, in accordance with the motto "Hardware and Software Engineered to Work Together." Indeed it is hard to find a better definition of these systems.  Allow me to summarize the idea. It is:  Build a compute platform optimized to run your technologies Develop application aware, intelligently caching storage components Take an impressively fast network technology interconnecting it with the compute nodes Tune the application to scale with the nodes to yet unseen performance Reduce the amount of data moving via compression Provide this all in a pre-integrated single product with a single-pane management interface All these ideas have been around in IT for quite some time now. The real Oracle advantage is adding the last one to put these all together. Oracle has built quite a portfolio of Engineered Systems, to run its technologies - and run those like they never ran before. In this post I'll focus on one of them that serves as a consolidation demigod, a multi-purpose engineered system.  As you probably have guessed, I am talking about the SPARC SuperCluster. It has many great features inherited from its predecessors, and it adds several new ones. Allow me to pick out and elaborate about some of the most interesting ones from a technological point of view.  I. It is the SPARC SuperCluster T4-4. That is, as compute nodes, it includes SPARC T4-4 servers that we learned to appreciate and respect for their features: The SPARC T4 CPUs: Each CPU has 8 cores, each core runs 8 threads. The SPARC T4-4 servers have 4 sockets. That is, a single compute node can in parallel, simultaneously  execute 256 threads. Now, a full-rack SPARC SuperCluster has 4 of these servers on board. Remember the keyword demigod.  While retaining the forerunner SPARC T3's exceptional throughput, the SPARC T4 CPUs raise the bar with single performance too - a humble 5x better one than their ancestors.  actually, the SPARC T4 CPU cores run in both single-threaded and multi-threaded mode, and switch between these two on-the-fly, fulfilling not only single-threaded OR multi-threaded applications' needs, but even mixed requirements (like in database workloads!). Data security, anyone? Every SPARC T4 CPU core has a built-in encryption engine, that is, encryption algorithms cast into silicon.  A PCI controller right on the chip for customers who need I/O performance.  Built-in, no-cost Virtualization:  Oracle VM for SPARC (the former LDoms or Logical Domains) is not a server-emulation virtualization technology but rather a serverpartitioning one, the hypervisor runs in the server firmware, and all the VMs' HW resources (I/O, CPU, memory) are accessed natively, without performance overhead.  This enables customers to run a number of Solaris 10 and Solaris 11 VMs separated, independent of each other within a physical server II. For Database performance, it includes Exadata Storage Cells - one of the main reasons why the Exadata Database Machine performs at diabolic speed. What makes them important? They provide DB backend storage for your Oracle Databases to run on the SPARC SuperCluster, that is what they are built and tuned for DB performance.  These storage cells are SQL-aware.  That is, if a SPARC T4 database compute node executes a query, it doesn't simply request tons of raw datablocks from the storage, filters the received data, and throws away most of it where the statement doesn't apply, but provides the SQL query to the storage node too. The storage cell software speaks SQL, that is, it is able to prefilter and through that transfer only the relevant data. With this, the traffic between database nodes and storage cells is reduced immensely. Less I/O is a good thing - as they say, all the CPUs of the world do one thing just as fast as any other - and that is waiting for I/O.  They don't only pre-filter, but also provide data preprocessing features - e.g. if a DB-node requests an aggregate of data, they can calculate it, and handover only the results, not the whole set. Again, less data to transfer.  They support the magical HCC, (Hybrid Columnar Compression). That is, data can be stored in a precompressed form on the storage. Less data to transfer.  Of course one can't simply rely on disks for performance, there is Flash Storage included there for caching.  III. The low latency, high-speed backbone network: InfiniBand, that interconnects all the members with: Real High Speed: 40 Gbit/s. Full Duplex, of course. Oh, and a really low latency.  RDMA. Remote Direct Memory Access. This technology allows the DB nodes to do exactly that. Remotely, directly placing SQL commands into the Memory of the storage cells. Dodging all the network-stack bottlenecks, avoiding overhead, placing requests directly into the process queue.  You can also run IP over InfiniBand if you please - that's the way the compute nodes can communicate with each other.  IV. Including a general-purpose storage too: the ZFSSA, which is a unified storage, providing NAS and SAN access too, with the following features:  NFS over RDMA over InfiniBand. Nothing is faster network-filesystem-wise.  All the ZFS features onboard, hybrid storage pools, compression, deduplication, snapshot, replication, NFS and CIFS shares Storageheads in a HA-Cluster configuration providing availability of the data  DTrace Live Analytics in a web-based Administration UI Being a general purpose application data storage for your non-database applications running on the SPARC SuperCluster over whichever protocol they prefer, easily replicating, snapshotting, cloning data for them.  There's a lot of great technology included in Oracle's SPARC SuperCluster, we have talked its interior through. As for external scalability: you can start with a half- of full- rack SPARC SuperCluster, and scale out to several racks - that is, stacking not separate full-rack SPARC SuperClusters, but extending always one large instance of the size of several full-racks. Yes, over InfiniBand network. Add racks as you grow.  What technologies shall run on it? SPARC SuperCluster is a general purpose scaleout consolidation/cloud environment. You can run Oracle Databases with RAC scaling, or Oracle Weblogic (end enjoy the SPARC T4's advantages to run Java). Remember, Oracle technologies have been integrated with the Oracle Engineered Systems - this is the Oracle on Oracle advantage. But you can run other software environments such as SAP if you please too. Run any application that runs on Oracle Solaris 10 or Solaris 11. Separate them in Virtual Machines, or even Oracle Solaris Zones, monitor and manage those from a central UI. Here the key takeaways once again: The SPARC SuperCluster: Is a pre-integrated Engineered System Contains SPARC T4-4 servers with built-in virtualization, cryptography, dynamic threading Contains the Exadata storage cells that intelligently offload the burden of the DB-nodes  Contains a highly available ZFS Storage Appliance, that provides SAN/NAS storage in a unified way Combines all these elements over a high-speed, low-latency backbone network implemented with InfiniBand Can grow from a single half-rack to several full-rack size Supports the consolidation of hundreds of applications To summarize: All these technologies are great by themselves, but the real value is like in every other Oracle Engineered System: Integration. All these technologies are tuned to perform together. Together they are way more than the sum of all - and a careful and actually very time consuming integration process is necessary to orchestrate all these for performance. The SPARC SuperCluster's goal is to enable infrastructure operations and offer a pre-integrated solution that can be architected and delivered in hours instead of months of evaluations and tests. The tedious and most importantly time and resource consuming part of the work - testing and evaluating - has been done.  Now go, provide services.   -- charlie  

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• Windows 7 can't copy file - Error 0x800700DF: The file size exceeds the limit allowed and cannot be

  - by JJGroover

  Any attempt to copy files larger than about 40 MB from a network share (a SAN running open filer / Samba) to my local machine running Windows 7 always results in the following error and the copy fails: Error 0x800700DF: The file size exceeds the limit allowed and cannot be saved. I've tried copying to my C: drive and a USB drive with the same results. Smaller files copy just fine. Clearly 40 MB is not that big of a file so I'm assuming it is some buggy interaction between windows 7 and Samba perhaps. Google has so far turned up nothing. Can anyone point me in the right direction?

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• Windows Server 2008 R2 Accessing NFS share without AD or NIS

  - by Jon Rhoades

  I'm trying to mount an NFS share on our NetApp SAN on Windows 2008 R2. Using XP I have no problem mounting this share without a username/NIS/pswd file etc, but the new functionality in 2008 seems to insist on either using AD or an NIS server (to "streamline" Services for NFS MS removed user account mapping) see Technet. When I go to map the share using "map network drive" no combination of "root", no username, no password, my username works. Using the command line mount -o anon \\172... :n or mount -o -u:root \\172... :n either gives me a network error 53 or 67 error Is it possible with 2008 to mount an NFS share without AD or NIS? If so what am I doing wrong? (Security is taken care off by IP address permissions and VLANs)

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• SQL Cluster on Hyper V Failover Cluster

  - by Chris W

  We have a VM running SQL Server on a 6 node cluster of blades. The VM's data files are stored a SAN attached using a direct iSCSI connection. As this SQL server will be running a number of important databases we're debating whether we should be clustering the SQL Server or will the fact that the VM is running in the cluster itself sufficient to give us high availability. I'm used to running SQL clusters when dealing with physical servers but I'm a bit sketchy on what is best practice when all the servers are just VMs sat on Hyper V. If a blade running the VM fails I presume the VM will be started up on another load. I'm guessing the only benefit that adding a SQL cluster to the setup will give us it that the recovery time after a failure will be a little quicker? Are there any other benefits?

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• Cluster Shared Volumes Mount Point

  - by Ryan H

  I am using Cluster Shared Volumes on Windows Server 2008 R2 with Hyper-V. The different volumes available have different sizes, and are physically located on different disks on the SAN. These volumes defaulted to labels such as C:\ClusterStorage\Volume1. I know that it is not possible / recommended to change where the CSV mount points are (C:\ClusterStorage), but I want to change the rest of the path to be a more useful name than "Volume1". In the Failover Cluster Manager, under Cluster Shared Volumes, I can see these CSVs, and they are working just fine. When I go into their properties, I can see a list, which has the mount point listed, but the entries are not modifiable. How can I change the mount point of a Cluster Shared Volume in Windows Server 2008 R2?

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• What happens when the USB key or SD card I've installed VMware ESXi on fails?

  - by ewwhite

  An SD (SDHC) card installed in an HP ProLiant DL380p Gen8 server running VMware ESXi just failed. I encountered some rather ominous looking messages on the vCenter console and in the HP ProLiant ILO event log... Lost connectivity to the device ... backing the boot filesystem. As a result, host configuration changes will not be saved to persistent storage. Embedded Flash/SD-CARD: Error writing media 0, physical block 848880: Stack Exception. VMware advocates the use of USB and SD (SDHC) boot devices for ESXi. It was one of the main reasons the smaller footprint ESXi was developed (versus the older ESX). I've spent much time highlighting the differences between ESXi's installable and embedded modes to coworkers and clients. However, these failures do seem to happen. In this case, this is my third instance. Luckily, this is a vSphere cluster with SAN storage. What steps should be taken to remediate this failure?

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• Active Directory using Samba/Open LDAP for user accounts

  - by Jon Rhoades

  I know this is the wrong way round... but Is it possible to use AD in front of Samba for our PC clients, so that the user accounts are in Samba/Open LDAP. Managing our fleet of Windows PC's is becoming more and more difficult with just Samba v3 - until Samba v4 comes along, it would be great if we could leverage Active Directory, but have the accounts stored in Samba/Open LDAP. Windows PC's are a minority in our organisation & Samaba/Open LDAP are used for just about every service (Zimbra/RADIUS/Intranet/SAN/Printing/...) so it will have to remain the definitive account source. Anyway, it probably can't be done, but I thought I would ask for ideas anyway.

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• NetApp and SQL Server?

  - by Edinor

  Do you have any good or bad experiences to share running SQL Server OLTP Systems on NetApp appliances? I have been working with a small, relatively low-volume cluster with a lower-end NetApp device, and I have found the environment to be generally unstable, at least compared to my experiences with other SANs, iSCSI arrays, and DAS setups. I struggle to believe that RAID DP and WAFL are more than fairy-dust technologies. A solution has been proposed to me that I just need a bigger, better NetApp, with PAM cards and other cool technology I've not heard of, and I feel like I would be better off spending a quarter of that on good direct-attached drives and a beefy server. At the same time, I feel that an Enterprise-class SAN should be something I can count on to be consistently a more stable, better performer than the less expensive solution I might propose. Are you a SQL Server DBA in an OLTP environment and love your NetApp? If you don't like them, why not?

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• Can ISC dhcpd operate as a proxy dhcp server for PXE boot?

  - by Matt

  I have an existing LAN with a DHCP server already dishing out IP addresses. For various reasons I cannot replace that server so it will still need to dish out IP addresses. I've been experimenting with dnsmasq in proxy mode to provide PXE boot filenames. Now I have dnsmasq chainloading iPXE ok, but I found that the problem with dnsmasq is that in proxy mode it won't send dhcp options down. So I can't seem to send option 17 to boot iscsi san. I read somewhere that it's not enabled in the source code. Oh well, so I thought perhaps I should try isc dhcpd (default version4 with ubuntu). But I can't find any configuration examples that work as a proxy. Does isc dhcpd even work in proxy mode? examples on the web imply patching the source. What other options do I have?

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• Dynamic group membership to work around no nested security group support for Active Directory

  - by Bernie White

  My problem is that I have a number of network administration applications like SAN switches that do not support nested groups from Active Directory Domain Services (AD DS). These legacy administration applications use either LDAP or LDAPS. I am fairly sure I can use Active Directory Lightweight Directory Services (AD LDS) and possibly Windows Authorization Manager to work around this issue; however I am not really sure where to start. I want to end up with: A single group that can be queried over LDAP/LDAPS for all it’s direct members LDAP proxy for user name and password credentials to AD DS Easy way to admin the group, ideally the group would aggregate the nested membership in AD DS. a native solution using freely available components from the Windows stack. If you have any suggestions or solutions that you have previously used to solve this issue please let me know.

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• Resizing an iscsi LUN on an EMC under Linux RHEL 5

  - by niXar

  I expanded a LUN on my SAN (from 30G to 50G), and tried all kind of voodoo but it looks like the system still believes the device is still small, despite showing me the new size alright. # blockdev --getsize64 /dev/sdl 53687091200 # dd if=/dev/sdl skip=$(( 31*1024*1024*1024/512 )) count=1|hexdump -C dd: reading `/dev/sdl': Input/output error The dd line works for blocks below the 30G original size. If I reboot, the problem goes away, but I don't want to since the machine has a dozen VMs running. I tried various magic, such as: iscsiadm -m node -R -I iface0 ... to no avail. Note: I'm not using multipath.

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• KVM online disk resize?

  - by Eil

  We're evaluting KVM for Linux virtualization on a few projects. All is going well so far. But one of our requirements is the ability to add disk space to a running guest without rebooting or taking it offline. Is this possible with KVM? The only thing I've found so far (but have not tested yet) is the ability to hotplug disks into the machine. If I go this route, then I could always add the new disk to an LVM volume group on the guest and then extend the chosen logical volume. The biggest downside to this approach is that over time we might end up with guests having variable numbers of virtual disks. The "real" disk space would be provided to the host over a SAN, so we can always add more space to the host whenever.

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• HP DL160 vs DL360 for virtualization

  - by Chris

  Hi, We're planning to consolidate our infrastructure (a dozen servers). We'll buy two or three identical new servers who will be setup as a XenServer pool. Load balancing and HA tools will monitor the pool and vMotion VMs in case of failure/overload. I know that the DL100 series of HP servers is cheaper than the DL300 serie (in every sense of the word). As we don't need local storage (we have a SAN) and can live with a temporary down server (provided that Xen Server HA tools work as advertized), what are the downsides going with the DL100 serie ? Thanks, Chris

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• Troubleshooting server performance with a hosted server?

  - by ProfessionalAmateur

  We are in a tough spot, we have a hosted server with the following specs: OS: Windows Server 2008 R2 Enterprise SP1 64bit Processor: Intel Xeon X7550 @ 2GHz (8 processors) RAM: 16GB The file system is on a SAN or NAS (not sure). We are seeing very odd issues where a user will open a 25MB .xslb file and it takes literally 60-120 seconds sometimes. The server is just dog slow for excel. Resources are not being pegged, CPU never jumps up, plenty of RAM... it's just oddly slow. Our host has been looking at the issue for several weeks with not much to show for it. Is there a utility I can run myself that will help trackdown our issue? I have found Server Performance Advisor V1.0 Any experience in using it? Our host is ultimately responsible for fixing this, but we are going on 1 month and our users are losing patience. Any tips would be helpful.

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• Why is business-class storage so expensive?

  - by Mark Henderson

  This is a Canonical Question about the Cost of Enterprise Storage. See also the following question: What's the best way to explain storage issues to developers and other users Regarding general questions like: Why do I have to pay 50 bucks a month per extra gigabyte of storage? Our file server is always running out of space, why doesn't our sysadmin just throw an extra 1TB drive in there? Why is SAN equipment so expensive? The Answers here will attempt to provide a better understanding of how enterprise-level storage works and what influences the price. If you can expand on the Question or provide insight as to the Answer, please post.

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• Unable to delete duplicate pagefile.sys

  - by user128364

  I have one SQL server that contain two drives on it and both drives are on SAN. C drive contains OS and V drive Contain pagefile.sys file. I rebooted my server and both drives was unmapped on SQL server. Some How one drive came (the OS drive) and created pagefile.sys on C drive and then I rebooted my server remapped the v drive. Now I have two pagefile.sys on C and V drive. But under Advance setting only V drive option is checked as pagefile. How do delete duplicate pagefile on C drive. It showing me that " the program is being used" while deleting the pagefile

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• Simple SQL Server 2005 Replication - "D-1" server used for heavy queries/reports

  - by Ricardo Pardini

  Hello. We have two SQL 2005 machines. One is used for production data, and the other is used for running queries/reports. Every night, the production machine dumps (backups) it's database to disk, and the other one restores it. This is called the D-1 process. I think there must be a more efficient way of doing this, since SQL 2005 has many forms of replication. Some requirements: 1) No need for instant replication, there can be (some) delay 2) All changes (including schemas, data, constraints, indexes) need to be replicated without manual intervention 3) It is used for a single database only 4) There is a third server available if needed 5) There is high bandwidth (gigabit ethernet) available between the servers 6) There isn't a shared storage (SAN) available What would be a good alternative to this daily backup/restore routine? Thanks!

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• using sed, how to change the text on line seven to read seventh?

  - by Steve

  using sed, how to change the text on line seven to read seventh? Steve Blenheim:238-923-7366:95 Latham Lane, Easton, PA 83755:11/12/56:20300 Betty Boop:245-836-8357:635 Cutesy Lane, Hollywood, CA 91464:6/23/23:14500 Igor Chevsky:385-375-8395:3567 Populus Place, Caldwell, NJ 23875:6/18/68:23400 Norma Corder:397-857-2735:74 Pine Street, Dearborn, MI 23874:3/28/45:245700 Jennifer Cowan:548-834-2348:583 Laurel Ave., Kingsville, TX 83745:10/1/35:58900 Jon DeLoach:408-253-3122:123 Park St., San Jose, CA 04086:7/25/53:85100 Karen Evich:284-758-2857:23 Edgecliff Place, Lincoln, NB 92743:7/25/53:85100 Fred Fardbarkle:674-843-1385:20 Parak Lane, Duluth, MN 23850:4/12/23:780900 Lori Gortz:327-832-5728:3465 Mirlo Street, Peabody, MA 34756:10/2/65:35200 Paco Gutierrez:835-365-1284:454 Easy Street, Decatur, IL 75732:2/28/53:123500 Ephram Hardy:293-259-5395:235 CarltonLane, Joliet, IL 73858:8/12/20:56700

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• Microsoft Office 2007

  - by nardone25

  Hello everyone in serverfault. I am having a big problem at my job. I will let everyone know what I am using. I have two ibm x3690 servers with vmware esxi on both. Our product server has 8 vm on there. I have two lefthand san from HP. I have a watchgurd firewall. Our other site. I have one server over there ibm x3b90 sever. with one vm on there. I have a cisco 1700 router. and another watchgurd firewall. I have a vpn tunnel to my watchgurd firewall, to my cisco router. Site one works great. site two is having problems saving word documents and having problems printing in publisher 2007. Can someone please help?

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• How to test TempDB performance?

  - by Matt Penner

  I'm getting some conflicting advice on how to best configure our SQL storage with our current SAN. I would like to do some of my own performance testing with a few different configurations. I looked at using SQLIOSim but it doesn't seem to simulate TempDB. Can anyone recommend a way to test data, log and TempDB performance? What about using a SQL profiler trace file from our production system? How would I use This to run against my test server? Thanks, Matt

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• How much should a Systems Administrator be making?

  - by Curtis

  Hello, I'm a Sys Admin for a small (but successful and growing) company (~60 employees). I've got roughly 5-6 years of actual sys admin experience, plus another 5+ years of lower level work in the industry. I'm responsible for most everything above a helpdesk level in the company (server[windows]/network[cisco]/firewall/SAN[emc] setup/configuration/maintenance/troubleshooting), lead many projects, analyze system data -- I'm sure you've heard it all before...I have a bunch of certs, most are just "nice to have", but the ones that actually apply to my role are CCNA, MSCE, VCP (VMware). If things go wrong, I'm first in line to resolve the issue. I'm not management (no one reports to me). I've seen many of these sorts of questions online before, and I know the typical response is "too many variables, depends on location, industry type" etc etc. I'm just wondering (ballpark) what I should be looking for. I've tried to give as much detail as I can, but if I'm missing something, I'd be glad to post it. Thanks anyone.

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