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• HP ML350G6 running hyper-V 2008 r2 resets itself every 2 hours

  - by GT

  The system started resetting itself exactly every 2 hours. These are the messages in the iLO2 log: Informational iLO 2 03/07/2010 20:40 03/07/2010 20:40 1 Server power restored. Caution iLO 2 03/07/2010 20:40 03/07/2010 20:40 1 Server reset. It's not an ASR reset (that would show in the log) Redundant power supplies, swapped but no change. Turned off all virtual machines (i.e. now only running hypervisor) but not OK Boot HP smartstart diagnostics disk, ALL OK Diagnostic disk reports no errors Went back to booting Hypervisor and the problem is back. Seems the hyper-V system disk has got a time based program (virus) causing the reset. I thought the hypervisor had a small attack surface and should be OK. All virtual machines (SBS2008, Win7 and Win XP) and network computers are protected with TrendMicro WFBS. I am about to rebuild the disk (I have backups) but wondered if there were any suggestions to try first???

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• HP ML350G6 running hyper-V 2008 r2 resets itself every 2 hours

  - by GT

  The system started resetting itself exactly every 2 hours. These are the messages in the iLO2 log: Informational iLO 2 03/07/2010 20:40 03/07/2010 20:40 1 Server power restored. Caution iLO 2 03/07/2010 20:40 03/07/2010 20:40 1 Server reset. It's not an ASR reset (that would show in the log) Redundant power supplies, swapped but no change. Turned off all virtual machines (i.e. now only running hypervisor) but not OK Boot HP smartstart diagnostics disk, ALL OK Diagnostic disk reports no errors Went back to booting Hypervisor and the problem is back. Seems the hyper-V system disk has got a time based program (virus) causing the reset. I thought the hypervisor had a small attack surface and should be OK. All virtual machines (SBS2008, Win7 and Win XP) and network computers are protected with TrendMicro WFBS. I am about to rebuild the disk (I have backups) but wondered if there were any suggestions to try first???

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• Writing an SVN hook that updates copy of committed code

  - by Jordan Reiter

  I have a SVN repository with a lot of sub-projects stored in it. Right now in my post-commit I just loop through all possible folders on the machine and run svn update on each: REPOS="$1" REV="$2" DIRS=("/path/to/local/copy/firstproject" "/path/to/local/copy/anotherproject" ... "/path/to/local/copy/spam") LOGNAME=`/usr/bin/whoami` for DIR in ${DIRS[@]} do cd $DIR sudo /usr/bin/svn update --accept=postpone 2>&1 | logger logger "$LOGNAME Updated $DIR to revision $REV (from $REPOS) " done The problem is that this is slow and redundant when I'm just committing the subfolder of one of the projects. I'm wondering if there's a better way of identifying which of the DIRS I should use and only update that one. Is there some way to do this? As far as I can tell there's no way to determine which part of a repo was committed and thus which directory needs to be updated. Is the only alternative to create a separate repository for each project? (Probably should have done that from the start, if so...)

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• Anyone have experience with Silicon Mechanics 4-Node Machines?

  - by Matt Simmons

  I'm taking a look at buying some new servers (small infrastructure, 2 racks, etc), and although I like a lot of the features in blades, I'm looking at the price point for Silicon Mechanics' 4-node machines. http://www.siliconmechanics.com/i27091/xeon-2U-4-Node.php It's a bit like a mini-blade enclosure, but has no shared resources, except for the redundant power supplies. A single point of management would be great, but for the low price point here, I'm possibly willing to give that up, if the server quality is adequate. Basically, have you used these machines? Any problems? Anything you like?

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• Static route in conflict with a default route

  - by Ossan Sokiv

  Hi guys, I have a default route configured. 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.1 I'd like to add a static route to pass traffic destined for 192.168.1.51 via a load balancer's redundant virtual interface at 192.168.1.2. ip route add 192.168.1.51 mask 255.255.255.255 via 192.168.1.2 When I try to add the static route I get this error. Error: either "to" is duplicate or "default" is garbage." It doesn't want to add the static route because it's in conflict with the default route. Is there a way around this? Regards Ossan

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• SAN typical MTBF

  - by Adrian K

  We're using a SAN on a project at work, and there's a bit of debate around the fact that's technically it's a Single Point of Failure. No one seems to have any hard data. The SAN in question is a single physical box, but with internal redundant components (sorry - not sure3 what level of RAID it has, but I can find out). What's the tyopical MTBF for a SAN? The PM has it down on the projects risk register as "Quite Common' - I've never heard of a SAN going down, but I don't jhave any stats to show how likely it really is. Does anyone have any helpful info?

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• sudoers file cleanup and consolidation tool/script

  - by Prashanth Sundaram

  Hello All, I am curious to know what other folks out there might be using to keep the sudoers file in a sane manner. I am looking for a tool, that removes redundant entries, overlapping permissions and/or present sudoers file in a organized way(like sorting by permissions/users/Aliases) User_Alias RT1123 jappleseed, sjobs Host_Alias HOST_RT1123 wdc101.domain.com, wdc104.domain.com Cmnd_Alias ..... Our sudoers file is simple but a lot of entries and it needs to be cleaned up. Does anyone know/have a tool/script to fix/present it ? Thanks!

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• sudoers file cleanup and consolidation tool/script

  - by Prashanth Sundaram

  Hello All, I am curious to know what other folks out there might be using to keep the sudoers file in a sane manner. I am looking for a tool, that removes redundant entries, overlapping permissions and/or present sudoers file in a organized way(like sorting by permissions/users/Aliases). I use SVN and Confi Mgmt. tool to version control and deploy resp. Is there any add-on/plugin you would recommend/use? User_Alias RT1123 jappleseed, sjobs Host_Alias HOST_RT1123 wdc101.domain.com, wdc104.domain.com Cmnd_Alias ..... Our sudoers file is simple but a lot of entries and it needs to be cleaned up. Does anyone know/have a tool/script to fix/present it ? Thanks!

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• Backing up SQL Azure

  - by Herve Roggero

  That's it!!! After many days and nights... and an amazing set of challenges, I just released the Enzo Backup for SQL Azure BETA product (http://www.bluesyntax.net). Clearly, that was one of the most challenging projects I have done so far. Why??? Because to create a highly redundant system, expecting failures at all times for an operation that could take anywhere from a couple of minutes to a couple of hours, and still making sure that the operation completes at some point was remarkably challenging. Some routines have more error trapping that actual code... Here are a few things I had to take into account: Exponential Backoff (explained in another post) Dual dynamic determination of number of rows to backup  Dynamic reduction of batch rows used to restore the data Implementation of a flexible BULK Insert API that the tool could use Implementation of a custom Storage REST API to handle automatic retries Automatic data chunking based on blob sizes Compression of data Implementation of the Task Parallel Library at multiple levels including deserialization of Azure Table rows and backup/restore operations Full or Partial Restore operations Implementation of a Ghost class to serialize/deserialize data tables And that's just a partial list... I will explain what some of those mean in future blob posts. A lot of the complexities had to do with implementing a form of retry logic, depending on the resource and the operation.

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• SBS 2008 Duplicate Files - what can I delete

  - by Stu

  I'm trying to look after my company's SBS 2008 server. It keeps running out of space on the C: (OS)drive, so Exchange stops when it gets down to 4Gb free space. From what I can tell after the last time I had a consultant in to fix it, there should comfortably be about 20Gb. Running a duplicate files report gives me a huge list of duplicated files, and identifies just how much space they are hogging. But my question is, which ones can I delete to recover the space? Can I tell, from what's shown on the report, the files that are redundant and can safely be deleted?

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• How to evaluate the quality of Rails code?

  - by Fortuity

  In a code review, what do you look for to assess a developer's expertise? Given an opportunity to look at a developer's work on a real-world project, what tell-tale signs are a tip-off to carelessness or lack of experience? Conversely, where do you look in the code to find evidence of a developer's skill or knowledge of best practices? For example, if I'm looking at a typical Rails app, I would be happy to see the developer is using RSpec (showing a commitment to using test-driven development and knowledge that RSpec is currently more popular than the default TestUnit). But in examining the specs for a Rails model, I see that the developer is testing associations, which might indicate a lack of real understanding of Rails testing requirements (since such tests are redundant given that they only test what's already implemented and tested in ActiveRecord). More generally, I might look to see if developers are writing their own implementations versus using widely available gems or if they are cleaning up code versus leaving lots of commented-out "leftovers." What helps you determine the skill of a Rails developer? What's your code quality checklist?

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• Anyone know of a good way to sell used servers?

  - by RandyMorris

  We have a couple of servers we no longer need now that we are fully hosted on a managed host (rackspace). They were purchased for over $10,000 each but we realize that over time their monetary value drops. Anyone have suggestions or experience selling these in a proper way? They are dual xeon processor 2U rack mountable with 4+GB RAM, intel boards, 6x 72GB 15,000 RPM SCSI Drives with raid controller redundant power supply. We are in Southern California area. I can be more specific on any information if there is interest. I know there is ebay and the like but these servers are like the family dog that has to be given up and we are looking for a proper home for a fair price. I will end up auctioning it off if need be in the end though. Thanks in advanced for any help!

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• storing map template in database

  - by Timigen

  I am working on an application that displays choropleth maps. These maps are of all different types, some display state by county, country by state/province, or world by country. How should I handle storing the map information in the database? My Thoughts: I won't need to do queries to find POI inside a region, so I don't think there is a need to use spatial datatypes. I am considering storing a map as a geoJSON object (I am using JS mapping library that accepts geoJSON). The only issue is what if I want a map of the US northeast. Then I would have geoJSON for the US and a separate one for the US northeast, which would be redundant. Would it make sense to have a shape database where I had each state then when I needed a map of the US I could query for each state, and when I needed a map of the US Northeast I could again query for what I need? Note: I am not concerned with storing the data for each region, just the region itself. I will query for the data on the fly for the specific region.

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• NFS failover WITHOUT DRBD?

  - by user439407

  So I am trying to set up a redundant NFS share in a cloud environment(all links internal, half gig links), and I am looking into using heartbeat for failover, but all the guides seem to be about combining DRBD and heartbeat to create a robust environment. If need be I can do that, but since my content is almost completely static, I would like to avoid the extra overhead and complexity of DRBD if possible, but still be able to fail over if one of the NFS servers fails. Is it possible to use heartbeat with NFS to achieve high-availability without using DRBD to copy the blocks? I am not married to NFSv4, so if NFSv3 over UDP is necessary, that won't be a problem(only a very small number of clients will be connecting to the share) Any comments are appreciated.

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• Instructor Insight: Using the Container Database in Oracle Database 12 c

  - by Breanne Cooley

  The first time I examined the Oracle Database 12c architecture, I wasn’t quite sure what I thought about the Container Database (CDB). In the current release of the Oracle RDBMS, the administrator now has a choice of whether or not to employ a CDB. Bundling Databases Inside One Container In today’s IT industry, consolidation is a common challenge. With potentially hundreds of databases to manage and maintain, an administrator will require a great deal of time and resources to upgrade and patch software. Why not consider deploying a container database to streamline this activity? By “bundling” several databases together inside one container, in the form of a pluggable database, we can save on overhead process resources and CPU time. Furthermore, we can reduce the human effort required for periodically patching and maintaining the software. Minimizing Storage Most IT professionals understand the concept of storage, as in solid state or non-rotating. Let’s take one-to-many databases and “plug” them into ONE designated container database. We can minimize many redundant pieces that would otherwise require separate storage and architecture, as was the case in previous releases of the Oracle RDBMS. The data dictionary can be housed and shared in one CDB, with individual metadata content for each pluggable database. We also won’t need as many background processes either, thus reducing the overhead cost of the CPU resource. Improve Security Levels within Each Pluggable Database  We can now segregate the CDB-administrator role from that of the pluggable-database administrator as well, achieving improved security levels within each pluggable database and within the CDB. And if the administrator chooses to use the non-CDB architecture, everything is backwards compatible, too.  The bottom line: it's a good idea to at least consider using a CDB. -Christopher Andrews, Senior Principal Instructor, Oracle University

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• Huge google impression drop after cleaning html

  - by olgatorresfoundation

  Good morning, I am the webmaster of a non-profit organization that donates grants to colorectal cancer research projects and funds various colorectal cancer information campaigns. We have three domains: www.fundacioolgatorres dot org (Catalan) www.fundacionolgatorres dot org (Spanish) www.olgatorresfoundation dot org (English) So what happened? I redesigned olgatorresfoundation on the 20th and the fundacionolgatorres on the 30th of May. In both cases, exactly two days later, the number of impressions on both dropped to a halt. Granted, we did not have the traffic of Microsoft, but a 90% decrease a disaster of incredible proportions for us. My only real changes were cleaning up the old ineffective HTML to a cleaner form (mostly moving away from redundant table construction to a table-less view). Here is a before and after snapshot of what the change looks like: Before: http://www.fundacioolgatorres.org/aparell_digestiu/introduccio/ (unchanged page in Catalan) After: http://www.olgatorresfoundation.org/digestive_system/introduction/ (changed page in English) Anybody has a clue to what just happened? Why should a normal, sane html improvement be punished and so dramatically? No URLs have been changed, neither have page names or descriptions. Possible secondary question: If it is so that Google sees it as a major overhaul and decides to drop the pagerank sharply, does it come back to pre-change levels if the content "checks out" or will the page start over from scratch earning those pagerank points (which would mean that we would have to wait 6 months for the pages to recover to the level they had two weeks ago)? (duplicated from productforums.google dot com/forum/#!category-topic/webmasters/crawling-indexing--ranking/YsnyX0JzOpY, hoping to reach a wider audience)

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• Why binding is not a native feature in most of the languages?

  - by Gulshan

  IMHO binding a variable to another variable or an expression is a very common scenario in mathematics. In fact, in the beginning, many students think the assignment operator(=) is some kind of binding. But in most of the languages, binding is not supported as a native feature. In some languages like C#, binding is supported in some cases with some conditions fulfilled. But IMHO implementing this as a native feature was as simple as changing the following code- int a,b,sum; sum := a + b; a = 10; b = 20; a++; to this- int a,b,sum; a = 10; sum = a + b; b = 20; sum = a + b; a++; sum = a + b; Meaning placing the binding instruction as assignments after every instruction changing values of any of the variable contained in the expression at right side. After this, trimming redundant instructions (or optimization in assembly after compilation) will do. So, why it is not supported natively in most of the languages. Specially in the C-family of languages? Update: From different opinions, I think I should define this proposed "binding" more precisely- This is one way binding. Only sum is bound to a+b, not the vice versa. The scope of the binding is local. Once the binding is established, it cannot be changed. Meaning, once sum is bound to a+b, sum will always be a+b. Hope the idea is clearer now. Update 2: I just wanted this P# feature. Hope it will be there in future.

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• My Thoughts on Reinventing the Wheel

  - by Matt Christian

  For awhile now I've known that XNA Game Studio contains built-in scene management however I still built my own for each engine.  Obviously it was redundant and probably inefficient due to the amount of searching and such I was required to do.  And even though I knew this, why did I continue to do it? I've always been very detail oriented, probably part of my mild OCD.  But when it comes to technology I believe in both reinventing the wheel and not reinventing it all at the same time.  Here's what I imagine most programmers doing.  When they pick up XNA, they're typically focused on 'I want to make a game with as little code as possible'.  This is great and XNA GS is a great tool, but what will it do for programmers that want to make games with XNA?  If they don't have any prior experience with other tools they will probably not ever learn scene management. So is it better to leverage code and risk not learning valuable techniques, or write it all yourself and fight through the headaches and hours of time you may spend on something already built?

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• Apache2 conditional section based on port

  - by Waleed Hamra

  I don't know much about if statements in apache configuration, and I'm wondering if I can have a section of the configuration applied only if the request is received on a certain port. In short, this is about SSL. I have name based virtual hosts, I can make a configuration for port 80, then duplicate it all for port 443, and add the relevant SSL configurations. But this seems redundant. I was wondering if i can have something like: <VirtualHost *:80 *:443> and then I can put: <IfModule mod_ssl.c> SSLEngine on SSLCertificateFile ... SSLCertificateKeyFile ... SSLCACertificateFile ... </IfModule> inside an if statement that checks if connection is on port 443... or is such thing impossible? the server supports SNI, and I don't have any worries from non-SNI compliant browsers.

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• vCenter Server: This host currently has no management network redundancy

  - by goober

  Background I'm on a new VMWare install consisting of: 1 vCenter Server (containing inventory service, SSO, vCenter server, and web client server) 2 ESX Servers configured in a HA group Problem When a I view the summary for any one of my servers, I receive a notice: "" This is expected in our scenario and we're okay with it. Attempted Solutions As I understand from this article and this discussion, the proper way to remove the error message is to ignore it via setting the "das.ignoreRedundantNetWarning" propery to "true". I took the following steps: Logged into vCenter Right-clicked on my HA cluster and chose "Edit Settings..." Clicked "vSphere HA" section Clicked "Advanced Options..." Added the "das.ignoreRedundantNetWarning" option with a value of "true". Question How do I get this error to go away, and are there any reasons why adding this option may not have worked? References Network redundancy message when configuring VMware High Availability in vCenter Server [VMWare KnowledgeBase] How remove a notice " has no management network redundant" [VMWare Community]

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• Oracle Exadata X3 announcement at Oracle Openworld

  - by Javier Puerta

  Oracle Announces Oracle Exadata X3 Database In-Memory MachineOracle Press ReleaseFourth Generation Exadata X3 Systems are Ideal for High-End OLTP, Large Data Warehouses, and Database Clouds; Eighth-Rack Configuration Offers New Low-Cost Entry Point During his opening keynote address at Oracle OpenWorld, Oracle CEO, Larry Ellison announced the Oracle Exadata X3 Database In-Memory Machine - the latest generation of its Oracle Exadata Database Machines. The Oracle Exadata X3 Database In-Memory Machine is a key component of the Oracle Cloud. Oracle Exadata X3-2 Database In-Memory Machine and Oracle Exadata X3-8 Database In-Memory Machine can store up to hundreds of Terabytes of compressed user data in Flash and RAM memory, virtually eliminating the performance overhead of reads and writes to slow disk drives, making Exadata X3 systems the ideal database platforms for the varied and unpredictable workloads of cloud computing. In order to realize the highest performance at the lowest cost, the Oracle Exadata X3 Database In-Memory Machine implements a mass memory hierarchy that automatically moves all active data into Flash and RAM memory, while keeping less active data on low-cost disks. With a new Eighth-Rack configuration, the Oracle Exadata X3-2 Database In-Memory Machine delivers a cost-effective entry point for smaller workloads, testing, development and disaster recovery systems, and is a fully redundant system that can be used with mission critical applications. Detailed info at Oracle Exadata Database Machine

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• Hyper-V Cluster with failover - NETWORKING

  - by Adam

  Hi We are looking to setup a 3 node Hyper-V cluster with live migration and failover using: 3 x Dell R710's with dual quad core Xeon & 128 GB RAM & 6 NICs in each 1 x Dell MD 3220i SAN We will be running this setup from a data center and so co-locating our kit. Can anybody explain how we should setup the network connections to make the system redundant? We have looked into this great article but are not sure how to get a 3 server setup correctly and reliably: http://faultbucket.ca/2011/01/hyper-v-failover-cluster-setup/. I believe we need network connections for: live migration, heartbeat, management, hyper-v etc. I assume as we are running it from a DC all IPs will have to be public IPs? Are AD servers will be VMs. One on each Hyper-V server and setup not to be HA.

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• Sun2Oracle: Upgrading from DSEE to the next generation Oracle Unified Directory - webcast follow up

  - by Darin Pendergraft

  Thanks to all of the guest speakers on our Sun2Oracle webcast: Steve from Hub City Media, Albert from UCLA and our own Scott Bonell. During the webcast, we tried to answer as many questions as we could, but there were a few that we needed a bit more time to answer.  Albert from UCLA sent me the following information: Alternate Directory EvaluationWe were happy with Sun DSEE. OUD, based on the research we had done, was a logical continuation of DSEE.  If we moved away, it was to to go open source. UCLA evaluated OpenLDAP, OpenDS, Red Hat's 389 Directory. We also briefly entertained Active Directory. Ultimately, we decided to stay with OUD for the Enterprise Directory, and adopt OpenLDAP for the non-critical edge directories.HardwareFor Enterprise Directory, UCLA runs 3 Dell PowerEdge R710 servers. Each server has 12GB RAM and 2 2.4GHz Intel Xeon E5 645 processors. We run 2 of those servers at UCLA's Data Center in a semi active-passive configuration. The 3rd server is located at UCLA Berkeley. All three are multi master replicated. At run time, the bulk of LDAP query requests go to 1 server. Essentially, all of our authn/authz traffic is being handled by 1 server, with the other 2 acting as redundant back ups.

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• How secure is Remote Desktop from Mac OS X to Windows Server 2003?

  - by dwhsix

  It's unclear to me exactly how secure Remote Desktop access from Mac OS X to a Windows Server 2003 machine is. Is the communication encrypted by default? What level of encryption? Are there best practices for making this as secure as possible? I found http://www.mobydisk.com/techres/securing_remote_desktop.html but it's unclear how much of that is still relevant for current versions of RDP and Windows Server. I know I can tunnel RDP over ssh, but is that overkill or redundant?

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• Linux HA - Best Heartbeat hardware solution

  - by Martino Dino

  Hi all I would ask anyone what is the best layer 2 medium for heartbeat in Linux and how it's best configured. More precisely I've been thinking about a dedicated NIC for that purpose but then i thought that if a switch breaks then i would loose the heartbeat connection for most of the cluster and STONITH 'BUM'!!! Will probably loose my job after :) Distributing the heartbeat onto the main NICs of every node trough a vif sounds reasonable but im not sure if this is the best option (at least the switches are redundant to some extent). Is it possible to use heartbeat over a bonded interface and that sounds reasonable? Do you have any other tip/solution for that issue?

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