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• Problems migrating software RAID 5 to new server (linux)

  - by leleu

  I have a CentOS setup with sw RAID5 that holds my data. Well, the server died, so I bought another box to migrate my drives to. Only thing is, I cannot get the RAID array rebuilt (not even sure it needs rebuilding, might just need the /dev/md0 mapping created... but I don't even know how to determine what I need!) Some details: RAID5 software (used mdadm) 4x 250GB drives (2 are SATA, 2 are EIDE -- would this matter? It worked fine in the other box...) latest CentOS distro built using mdadm I've got a decent amount of experience with standard linux stuff, but the hardware level stuff runs me in circles. I've spent some time googling and elsewhere here on SF, so please be kind for my newbie questions :). My question is this: how can I diagnose the problem? For all I know, I'm using the wrong device blocks when I try to rebuild the array, but I can't find the command to display only the devices that have some physical attachment. Is there some simple way for me to run mdadm, having it scan over all my physical drives, and say "hey, drives 2,5,6,7 are a software array, want me to mount it?" I basically just took the drives from my old box and put it into my new one. They show up in the BIOS. What steps do I need to take in order to get the array up, running, and mounted? Thanks in advance!

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• smartctl not actually running self tests?

  - by canzar

  I want to run the smartctl self tests to check the health of the drives in my RAID array (PERC 5/i). The array is on sda and comprises six drives. I can check the status using sudo smartctl /dev/sda -d megaraid,0 -a And I see that SMART is available and enabled on all the drives. I have tried to run self tests using sudo smartctl /dev/sda -d megaraid,0 -t short and sudo smartctl /dev/sda -d megaraid,0 -t long I have also tried it on all of the drives 0-5. No matter what I try, when I run: sudo smartctl /dev/sda -d megaraid,0 -l selftest I always get the same result, which seems to always report that I have never run a self test. /dev/sda [megaraid_disk_00] [SAT]: Device open changed type from 'megaraid' to 'sat' ===START OF READ SMART DATA SECTION === SMART Self-test log structure revision number 1 No self-tests have been logged. [To run self-tests, use: smartctl -t] From what I read, I should have no problem running the short and long self tests on the array while it is mounted. Does anyone else have experience running these tests on a PERC 5/i raid array who could lend some insight into what is causing the problem? (smartmontools release 5.40 dated 2009-12-09 at 21:00:32 UTC)

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• Create Windows AMI with instance storage

  - by Jonathan Oliver

  I have a business use case and workflow where local/instance/ephemeral storage for an EC2 instance is ideal. Unfortunately I'm coupled to a Windows platform for this particular task and the EC2 Windows offering appears to have some deficiencies related to AMI creation. In essence, I'm trying to figure out if there's a way to attach local instance storage to a Windows EC2 instance using the typical command line interface (because the Amazon Website GUI doesn't support it) and then to somehow create an AMI based upon that. I've tried creating a snapshot and then creating a Windows AMI based upon the snapshot, but of course the docs say this is unsupported and makes an unbootable AMI. In short, here's what I'm trying to do: Be able to run a Windows instance (EBS/S3 instance doesn't matter) Attach local instance storage as drive D: Persist that configuration as an AMI such that I can start lots of them as necessary from either the GUI, command line, or REST API. Be able to take a launched instance, update software, shutdown, and create another AMI based upon that. Wash, rinse, repeat. One other potential option which isn't horrible, but isn't ideal is to create an AMI which has 2 EBS volumes already attached (system+apps and data). Essentially, every time I startup an instance based upon the AMI it'll create 2 new EBS volumes of pre-determined size. I'm trying to avoid that scenario if possible.

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• Mirror a RAID0 volume

  - by Ghostrider

  I have two SSD running in RAID0. The capacity and speed are just great. I use Windows Home Server to do incremental daily backups. This is fine and well and I've successfully restored from these backups. However. When one of the disks physically died. I was stuck without a working system until the replacement arrives so that I can restore the array from backup. WHS restoration takes about 5 hours which basically means that I'm losing entire day for the process. Is it possible to set up kind of a recovery volume for the RAID array? Use a single mechanical HDD that would be updated with the exact clone of the RAID array on a daily basis. This way if the array goes offline for some reason, I can just boot from the mechanical HDD, lose some perf but will still be able to work. The machine in question runs Windows 7. Creating RAID01 is not an option because of the high price of the SSD and the fact that it still doesn't protect against failure of RAID controller. Is there any way it can be set up?

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• PostgreSQL lots of large Arrays and Writes

  - by strife911

  Hi, I am running a python program that spawns 8 threads and as each thread launch its own postmaster process via psycopg2. This is to maximize the use of my CPU-cores (8). Each thread call a series of SQL Functions. Most of these functions go through many thousands of rows each associated to a large FLOAT8[] Array (250-300) values by using unnest() and multiplying each FLOAT8 by an another FLOAT8 associated to each row. This Array approach minimized the size of the Indexes and the Tables. The Function ends with an Insert into another Table of a row of the same form (pk INT4, array FLOAT8[]). Some SQL Functions called by python will Update a row of these kind of Tables (with large Arrays). Now I currently have configured PostgreSQL to use most of the memory for cache (effective_cache_size of 57 GB I think) and only a small amount of it for shared memory (1GB I think). First, I was wondering what the difference between Cache and Shared memory was in regards to PostgreSQL (and my application). What I have noticed is that only about 20-40% of my total CPU processing power is used during the most Read intensive parts of the application (Select unnest(array) etc). So secondly, I was wondering what I could do to improve this so that 100% of the CPU is used. Based on my observations, it does not seem to have anything to do with python or its GIL. Thanks

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• How to install a private user script in Chrome 21+?

  - by Mathias Bynens

  In Chrome 20 and older versions, you could simply open any .user.js file in Chrome and it would prompt you to install the user script. However, in Chrome 21 and up, it downloads the file instead, and displays a warning at the top saying “Extensions, apps, and user scripts can only be added from the Chrome Web Store”. The “Learn More” link points to http://support.google.com/chrome_webstore/bin/answer.py?hl=en&answer=2664769, but that page doesn’t say anything about user scripts, only about extensions in .crx format, apps, and themes. This part sounded interesting: Enterprise Administrators: You can specify URLs that are allowed to install extensions, apps, and themes directly through the ExtensionInstallSources policy. So, I ran the following commands, then restarted Chrome and Chrome Canary: defaults write com.google.Chrome ExtensionInstallSources -array "https://gist.github.com/*" defaults write com.google.Chrome.canary ExtensionInstallSources -array "https://gist.github.com/*" Sadly, these settings only seem to affect extensions, apps, and themes (as it says in the text), not user scripts. (I’ve filed a bug asking to make this setting affect user scripts as well.) Any ideas on how to install a private user script (that I don’t want to add to the Chrome Web Store) in Chrome 21+? Update: The problem was that gist.github.com’s raw URLs redirect to a different domain. So, use these commands instead: # Allow installing user scripts via GitHub or Userscripts.org defaults write com.google.Chrome ExtensionInstallSources -array "https://*.github.com/*" "http://userscripts.org/*" defaults write com.google.Chrome.canary ExtensionInstallSources -array "https://*.github.com/*" "http://userscripts.org/*" This works!

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• VMware vSphere 4.1 and BackupExec 2010

  - by Josh

  I'm sure a common problem with most shops is backups, their size, and the window in which you have to back up the data. What we are working with: VMware vSphere 4.1 Cluster PS4000XV Equallogic Storage Array (1.6TB Volume dedicated for Backup to Disk) Physical Backup Server with a single LTO4 drive. BackupExec 2010 R3 with the following agents, Exchange, SQL, Active Directory, VMware. Dual Gigabit MPIO Connections between all devices (Storage Array, Backup Server, VM Hosts) What we would like to accomplish: I would like to implement an efficient Backup to Disk to Tape solution where all of our VMs are backed up to the Storage Array first, and then once completely backed up to the array are replicated to tape. In the event we needed to recover, we would be able to do so directly from tape. Where we are at currently. Of the several ways I have setup the jobs in Backup Exec 2010 R3 the backup jobs all queue up at the same time, as soon as a job is finished backing up to disk it then starts that same job to tape, but pulling from the original source instead of the designated B2D location. I understand that I could create a job that backs up the "Backup to Disk" folder to tape, but in the event of restoration, I would first need to stage the data in the B2D folder before I could restore the VM. I would really like to hear from individuals in similar situations. Any and all comments and critiques are appreciated.

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• How do photoshop slices and layer comps interact?

  - by Steve314

  I'm interested in using Photoshop (I have CS2) for some user interface design. I was hoping to be able to use slices and layer comps to mark out particular elements, and use Javascript scripting to export multiple graphics files and text descriptions (positions and sizes of slices mainly) that will be used by my program. My problem is that I've never used Photoshop for web design, or otherwise used slices, and I'm not confident that I understand how they interact with layer comps. This is what I believe (and hope) is correct... Manual slices aren't affected by layer comps in any way - they aren't saved as part of a layer comp. The same manual slices will be active irrespective of which layer comp is selected. Layer-based slices aren't directly affected by layer comps, but they are indirectly affected in that the layer comp saves details of layer position and style. Thus selecting a layer comp may move a layer and change its style, affecting the location and size of its layer-based slice, or may effectively disable the slice by hiding the layer. Automatic slices aren't directly affected by layer comps, but are indirectly affected due to changes to the layer-based slices. So, layer based slices (which are my main interest) may move, may change size (to accomodate a style such as a drop shadow), and may be effectively disabled by the layer being hidden. Other details (and all details of manual slices) will remain constant irrespective of which layer comp is active. Is that correct?

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• Defeating the RAID5 write hole with ZFS (but not RAID-Z) [closed]

  - by Michael Shick

  I'm setting up a long-term storage system for keeping personal backups and archives. I plan to have RAID5 starting with a relatively small array and adding devices over time to expand storage. I may also want to convert to RAID6 down the road when the array gets large. Linux md is a perfect fit for this use case since it allows both of the changes I want on a live array and performance isn't at all important. Low cost is also great. Now, I also want to defend against file corruption, so it looked like a RAID-Z1 would be a good fit, but evidently I would only be able to add additional RAID5 (RAID-Z1) sets at a time rather than individual drives. I want to be able to add drives one at a time, and I don't want to have to give up another device for parity with every expansion. So at this point, it looks like I'll be using a plain ZFS filesystem on top of an md RAID5 array. That brings me to my primary question: Will ZFS be able to correct or at least detect corruption resulting from the RAID5 write hole? Additionally, any other caveats or advice for such a set up is welcome. I'll probably be using Debian, but I'll definitely be using Linux since I'm familiar with it, so that means only as new a version of ZFS as is available for Linux (via ZFS-FUSE or so).

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• How to copy a bunch of pages? Is there a 3rd party tool?

  - by unknown (yahoo)

  (I asked the following question at the DNN forum, and also at snowcovered. Nobody knew of such an obvious time-saver being for sale. I'm posting here in case anybody knows of a freeware module that might do this.) By "groups of dnn pages", I mean pages that form a hierarchy (not necessary a hierarchy that is headed with a page at the same level as the Home page.) I know that I can copy web pages, one by one, using the admin login via the web-based dnn interface. But, I'd prefer a script or wizard, of some sort (that runs scripts behind the scenes) that can allow me to 1) specify a web page that I want to copy (along with the hierarchy of pages under it) 2) specify the names and titles of the new top-level pages 3) specify whether the contained modules of the top-level page that I want to copy is to be : ( ) New ( ) Copy ( ) Reference (as in the web-based interface) 4) repeat 3) for each of the source pages in the hierarchy that I want to copy You might say that I am looking to do something similar to creating a portal web site based on a template, except that it's not an entirely new website - instead it's a section of the current web site. I might want to do this because I have an organization which is broken into chapters, and I want each chapter to have, say, it's own General Information page (which acts like it's home page), and underneath that, in it's hierarchy, a Contact Info page and an Events page. so: Home Page   General Information Page     Contact Info     Events -- Home Page   General Information Page     Contact Info     Events   General Information Page Kiwanis - Bloomfield     Contact Info     Events   General Information Page Kiwanis - Dayton     Contact Info     Events If I have 200 chapters, I certainly don't want to copy those 3 web pages using the web based interface, as that would take a long time. (And imagine if each chapter's new sub-website had 30 pages!) I just want to specify the parameters of a copy process, then press a button, and let the system do the rest.

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• MediaWiki migrated from Tiger to Snow Leopard throwing an exceptions

  - by Matt S

  I had an old laptop running Mac OS X 10.4 with macports for web development: Apache 2, PHP 5.3.2, Mysql 5, etc. I got a new laptop running Mac OS X 10.6 and installed macports. I installed the same web development apps: Apache 2, PHP 5.3.2, Mysql 5, etc. All versions the same as my old laptop. A Mediawiki site (version 1.15) was copied over from my old system (via the Migration Assistant). Having a fresh Mysql setup, I dumped my old database and imported it on the new system. When I try to browse to mediawiki's "Special" pages, I get the following exception thrown: Invalid language code requested Backtrace: #0 /languages/Language.php(2539): Language::loadLocalisation(NULL) #1 /includes/MessageCache.php(846): Language::getFallbackFor(NULL) #2 /includes/MessageCache.php(821): MessageCache->processMessagesArray(Array, NULL) #3 /includes/GlobalFunctions.php(2901): MessageCache->loadMessagesFile('/Users/matt/Sit...', false) #4 /extensions/OpenID/OpenID.setup.php(181): wfLoadExtensionMessages('OpenID') #5 [internal function]: OpenIDLocalizedPageName(Array, 'en') #6 /includes/Hooks.php(117): call_user_func_array('OpenIDLocalized...', Array) #7 /languages/Language.php(1851): wfRunHooks('LanguageGetSpec...', Array) #8 /includes/SpecialPage.php(240): Language->getSpecialPageAliases() #9 /includes/SpecialPage.php(262): SpecialPage::initAliasList() #10 /includes/SpecialPage.php(406): SpecialPage::resolveAlias('UserLogin') #11 /includes/SpecialPage.php(507): SpecialPage::getPageByAlias('UserLogin') #12 /includes/Wiki.php(229): SpecialPage::executePath(Object(Title)) #13 /includes/Wiki.php(59): MediaWiki->initializeSpecialCases(Object(Title), Object(OutputPage), Object(WebRequest)) #14 /index.php(116): MediaWiki->initialize(Object(Title), NULL, Object(OutputPage), Object(User), Object(WebRequest)) #15 {main} I tried to step through Mediawiki's code, but it's a mess. There are global variables everywhere. If I change the code slightly to get around the exception, the page comes up blank and there are no errors (implying there are multiple problems). Anyone else get Mediawiki 1.15 working on OS X 10.6 with macports? Anything in the migration from Tiger that could cause a problem? Any clues where to look for answers?

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• Google: "302 Moved" in Firefox

  - by Virtlink

  For some Google search queries executed from the Firefox search bar, or manually by typing in the URL, I get a ''302 Moved'' page. I did a quick virus scan, have checked the hosts file and the plugins and add-ons that are installed in Firefox. Nothing is out of the ordinary. What could be the problem? These URLs (and any URL with google.com, empty and firefox-a in them) show me a 302 Moved page: https://www.google.com/search?q=c%23+empty+array&client=firefox-a https://www.google.com/search?q=empty&client=firefox-a Whereas these URLs work fine: https://www.google.com/search?q=c%23+empty+array (no firefox-a) https://www.google.com/search?q=empty (no firefox-a) https://www.google.com/search?q=c%23+array&client=firefox-a (no empty) https://www.google.nl/search?q=c%23+empty+array&client=firefox-a (no .com) By default Google redirects my queries to their .nl website, and uses HTTPS. I am currently executing a full system virus scan using Security Essentials. My Firefox plugins were up-to-date. No unfamiliar Firefox plugins or add-ons found. Restarting Firefox did not solve the issue. The issue does not occur in Internet Explorer. The hosts file did not contain any unfamiliar entries.

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• Using IIS7 as a reverse proxy

  - by Eric Petroelje

  I'm setting up a server at home to host a few small websites. One of them is .NET based and needs IIS, the others are PHP based and need Apache. So, I have both IIS 7 and Apache 2.2.x installed on my server with IIS on port 80 and Apache running on port 8080. I would like to set up IIS to work as a reverse proxy, forwarding the requests for the Apache sites to port 8080 and serving the requests for the .NET site itself based on the host headers. Like this: www.mydotnetsite.com/* -> IIS -> serve from IIS www.myapachesite.com/* -> IIS -> forward to apache on port 8080 www.myothersite.com/* -> IIS -> forward to apache on port 8080 I did a bit of googling and it seemed like the Application Request Routing feature would do what I needed, but I can't seem to get it to work the way I want it to. I can get it to forward ALL traffic to the Apache server and I can get it to forward traffic with a specific URL pattern to the Apache server, but I can't seem to get it to forward based on the host headers (e.g. "forward all requests for www.apachesite.com - localhost:8080") So the question is, how would I go about configuring ARR to do this? Or do I need a different tool? I'm also open to using Apache as the reverse proxy and forwarding the .NET site requests to IIS instead if that's easier (running Apache on port 80 and IIS on 8080).

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• How to get multipath working for Ubuntu Server 12.04

  - by mlampi

  I'm working on a project which aims to make use of Ubuntu servers running on enterprise class hardware. In our case that means IBM HS23E blade servers, QLogic 4GB fibre channel extension cards and quite old IBM DS4500 disk array with two controllers. At the moment we have fibre channel as only boot option and Ubuntu Server 12.04 installed just fine and is able to boot without multipath. I'm not a linux professional myself but in our team we have people who will understand the technical stuff. Don't let my post confuse :) The current situation is that we have only one fibre channel connection to a single disk array controller. Real life case would be of course quite different. At minimum we should have two fibre channel ports connected to two different switches and two different controllers. However, we have no idea how to set up multipath tool. Is the DM-MPIO the right software? At minimum we should be able to boot when multiple connections are available and achieve fault tolerance when any of them should be down. Since the disk array is not the latest hardware, I managed to find RDAC driver sources only for 2.6.x kernel. And we have 3.2.x. Another issue is to build a multipath.conf. The said driver sources are from IBM support and the QLogic drivers provided to Ubuntu installer are from Ubuntu site. It seems that RHEL and SLES would have near out of the box support but that is not an option for our project. Actual questions: - What is the recommended software tool for multipath for Ubuntu Server 12.04? - Is there available pre-made configurations or templates? Does it require disk array / controller specific settings or do a more generic config work? - Do you have expriences on similar setup and like to share the knowledge? I'll provide you with any additional information you might require. Thanks in advance.

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• How do I configure custom URL handlers on OS X?

  - by cwd

  I've been reading a lot online about custom URL handlers / custom protocol handlers such as: Launching External Applications using Custom Protocols under OSX OS X URL handler to open links to local files I get that you can tell the system that a particular program is able to handle a certain scheme / protocol with the Info.plist file: <key>CFBundleURLTypes</key> <array> <dict> <key>CFBundleURLName</key> <string>Local File</string> <key>CFBundleURLSchemes</key> <array> <string>local</string> </array> </dict> </array> <key>NSUIElement</key> <true/> But if there are multiple applications that are capable of opening the same URL handler, such as mailto: how do you specify which one you want the system to use? There were some references to utilities like the More Internet preference pane which no longer seems to be available from the author's site. I did find it online by Googling but it seems a bit shaky - like it was written for an older OSX - perhaps Tiger. I haven't been able to find information on how to set the URL handler for protocols and custom protocols. I'm assuming there is a plist file somewhere that I can edit - or maybe there is a newer, better utility that works well with Mountain Lion?

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• Scriptable BitTorrent clients?

  - by James McMahon

  In an effort further automate all the little computer house keeping tasks that can waste my time I am looking into BitTorrent clients that have the ability to script common tasks. I've done some Googling and it looks like Transmission might have some of said such capabilities, but there site wasn't very clear on the details. Things I am looking to do; Prioritize and label torrents based on trackers Set seed length based on trackers and filesize Set additional seed time when a torrent's seed time expires based on a number of factors, like time spent seeding, remaining disk space and ratio. Move torrents to appropriate places post seeding based on labels and tracker Basically, while I could Python or Bash script things like moving torrents around and other simple actions, I need away to talk to the client to figure out things like the torrent seed time, tracker, labels, filesize, etc. Is there any client out there that would allow me to all or a subset these actions? I have access to Linux, Mac and Windows and am not tied to any particular torrent client. I am a programmer so I have no problems writing scripts, but examples of torrent scripting would also be helpful.

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• How important is dual-gigabit lan for a super user's home NAS?

  - by Andrew

  Long story short: I'm building my own home server based on Ubuntu with 4 drives in RAID 10. Its primary purpose will be NAS and backup. Would I be making a terrible mistake by building a NAS Server with a single Gigabit NIC? Long story long: I know the absolute max I can get out of a single Gigabit port is 125MB/s, and I want this NAS to be able to handle up to 6 computers accessing files simultaneously, with up to two of them streaming video. With Ubuntu NIC-bonding and the performance of RAID 10, I can theoretically double my throughput and achieve 250MB/s (ok, not really, but it would be faster). The drives have an average read throughput of 83.87MB/s according to Tom's Hardware. The unit itself will be based on the Chenbro ES34069-BK-180 case. With my current hardware choices, it'll have this motherboard with a Core i3 CPU and 8GB of RAM. Overkill, I know, but this server will be doing other things as well (like transcoding video). Unfortunately, the only Mini-ITX boards I can find with dual-gigabit and 6 SATA ports are Intel Atom-based, and I need more processing power than an Atom has to offer. I would love to find a board with 6 SATA ports and two Gigabit LAN ports that supports a Core i3 CPU. So far, my search has come up empty. Thus, my dilemma. Should I hold out for such a board, go with an Atom-based solution, or stick with my current single-gigabit configuration? I know there are consumer NAS units with just one gigabit interface (probably most of them), but I think I will demand a lot more from my server than the average home user. Any advice is appreciated. Thanks.

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• arrays in puppet

  - by paweloque

  I'm wondering how to solve the following puppet problem: I want to create several files based on an array of strings. The complication is that I want to create multiple directories with the files: dir1/ fileA fileB dir2/ fileA fileB fileC The problem is that the file resource titles must be unique. So if I keep the file names in an array, I need to iterate over the array in a custom way to be able to postfix the file names with the directory name: $file_names = ['fileA', 'fileB'] $file_names_2 = [$file_names, 'fileC'] file {'dir1': ensure => directory } file {'dir2': ensure => directory } file { $file_names: path = 'dir1', ensure =>present, } file { $file_names_2: path = 'dir2', ensure =>present, } This wont work because the file resource titles clash. So I need to append e.g. the dir name to the file title, however, this will cause the array of files to be concatenated and not treated as multiple files... arghh.. file { "${file_names}-dir1": path = 'dir1', ensure =>present, } file { "${file_names_2}-dir2": path = 'dir1', ensure =>present, } How to solve this problem without the necessity of repeating the file resource itself. Thanks

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• Server configration for our website [duplicate]

  - by Varun Varunesh

  This question already has an answer here: Can you help me with my capacity planning? 2 answers We are a start-up and 6 month back we have launched our beta version website. Now we are in a phase of building our website and web-services for the final product. This website will be based on PHP, Python, MySql database and with wamp server. Right now in the beta version we are using Azure VM for hosting, with configuration of 786MB RAM and Shared CPU. We have 200 avg users daily coming to our website. Now we are trying to increase the number of users from 200 to 1500 daily users. And I am thinking our server should have capability to handle at least 100 concurrent user. Also we have developed web-services for our mobile-apps. Which can also increase loads on the sever. So here are the question that takes me here, I am pretty much confused about whether to go with shared hosting or VM based hosting. If VM, then what configuration will be best for our requirement (as I discussed above) ? Currently our VM is a Windows based server and its very simple to manage, So other than cost factor why should I go for Linux based sever? What other factor should I keep in mind while choosing the server as per our requirement ?

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• Reusing slot numbers in Linux software RAID arrays

  - by thkala

  When a hard disk drive in one of my Linux machines failed, I took the opportunity to migrate from RAID5 to a 6-disk software RAID6 array. At the time of the migration I did not have all 6 drives - more specifically the fourth and fifth (slots 3 and 4) drives were already in use in the originating array, so I created the RAID6 array with a couple of missing devices. I now need to add those drives in those empty slots. Using mdadm --add does result in a proper RAID6 configuration, with one glitch - the new drives are placed in new slots, which results in this /proc/mdstat snippet: ... md0 : active raid6 sde1[7] sdd1[6] sda1[0] sdf1[5] sdc1[2] sdb1[1] 25185536 blocks super 1.0 level 6, 64k chunk, algorithm 2 [6/6] [UUUUUU] ... mdadm -E verifies that the actual slot numbers in the device superblocks are correct, yet the numbers shown in /proc/mdstat are still weird. I would like to fix this glitch, both to satisfy my inner perfectionist and to avoid any potential sources of future confusion in a crisis. Is there a way to specify which slot a new device should occupy in a RAID array? UPDATE: I have verified that the slot number persists in the component device superblock. For the version 1.0 superblocks that I am using that would be the dev_number field as defined in include/linux/raid/md_p.h of the Linux kernel source. I am now considering direct modification of said field to change the slot number - I don't suppose there is some standard way to manipulate the RAID superblock?

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• Reusing Raid 5 Drive?

  - by User125

  We have two servers (ML530 G2 and DL380G2) w/ identical HP 10K RPM SCSI drives w/ a raid 5. One is decommissioned and the other will be decommissioned shortly. However, one of the drives on the production server had a drive failure. My hope was to take one of the drives from the decommissioned server and pop it into the production server. Both are running RAID 5. I broke the array on the decomm. server. To my knowledge, that should have wiped out all the volume and partition information. However, I do not know if it is safe to then take a drive from the decomm'ed server and replace the failed drive. Will the existing array see it as a replacement drive, wipe it and rebuild? Or will it fail because it was used in an array before. Are there any remnant data that resides on the drives after deleting a raid 5 array? These servers are 10-15 years old, so we're just trying to keep them alive until we decommission it. I'm not looking to pay a premium to find a vendor that still sells replacement drives for this system.

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• Reverse web proxy with time constraints

  - by user2893458

  I have a web application which produces several unique URLs of the type http://service.company.com/service.html?type=aaaa&key=jfiZm6u6cW where the last part is a randomly generated key. Each such URL provides access to an instance of the service provided. I am looking for a way to restrict access to those URLs based on time constraints, as an example URL#1 should be available between 8:00AM and 10:00AM on May 30, URL#2 should be available between 10:30AM and 12:00PM on May 31, and so on. I already have a resource scheduling application based on Drupal and would like to find a way to include those URLs as scheduled resources. The web application is deployed on Apache Tomcat, so I don't have the knowledge or the resources to alter it, therefore I thought that I could put some sort of reverse proxy in front of the web app that could implement the time constraint feature. In my thoughts the reverse proxy would allow or disallow access to each URL based on the rules that my scheduling application would provide. There may be other ways to deliver such a solution, but I can't think of anything better, so the question is: is there a reverse web proxy architecture that could allow access to the destination URLs based on time and date rules? Any other ideas are more than welcome.

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• Failed Software RAID0 on Linux - Attempting to recover data

  - by Gizmo_the_Great

  I have a two disk RAID0 software raid (not hardware raid) that is reported to have failed during boot and my OS won't start. Using a Live CD, I get the following output : sudo mdadm -E /dev/sdc1 /dev/sdd1 /dev/sdc1: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 3710713d:fb301031:84b61247:d1d53e0f Name : HP-xw9300:0 Creation Time : Sun Sep 1 15:22:26 2013 Raid Level : -unknown- Raid Devices : 0 Avail Dev Size : 1465145328 (698.64 GiB 750.15 GB) Data Offset : 16 sectors Super Offset : 8 sectors State : active Device UUID : ad427cd2:9f885f57:7f41015f:90f8f6af Update Time : Sun Jun 8 12:35:11 2014 Checksum : a37407ff - correct Events : 1 Device Role : spare Array State : ('A' == active, '.' == missing) /dev/sdd1: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 3710713d:fb301031:84b61247:d1d53e0f Name : HP-xw9300:0 Creation Time : Sun Sep 1 15:22:26 2013 Raid Level : -unknown- Raid Devices : 0 Avail Dev Size : 976771056 (465.76 GiB 500.11 GB) Data Offset : 16 sectors Super Offset : 8 sectors State : active Device UUID : 2ea0199d:cb08d9e7:0830448a:a1e1e348 Update Time : Sun Jun 8 13:06:19 2014 Checksum : 8883c492 - correct Events : 1 Device Role : spare Array State : ('A' == active, '.' == missing) GParted lists both disks, detects the flags as 'Raid' and lists the data usage. Can anyone please help me re-assemble just so that I can copy some of the data off that I have not backed up recently? Thanks

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• Formatting a former RAID 0 drive through USB

  - by EXC

  I'll try to be as specific as possible here: I was using two Hitachi 2.5" 500 gb HDDs in my Gateway P-7805u laptop in a RAID 0 configuration. The array was causing the laptop to run extremely hot, however, so I removed them and deleted the RAID array through Intel Matrix HDD manager. I did a clean install of Windows 7 on the original 320 gb HDD that came with the laptop. I never did format the original RAID array HDDs before taking them out of the computer. Now, I am attempting to format the Hitachi 500 gb RAID array HDDs externally through a USB external enclosure. The external HDD drivers install on my clean install OS, but when I go into 'My Computer' there is no external drive available. I cannot format in CMD Prompt because my computer will not designate a drive letter to the external HDD. The drivers install and the HDD is recognized as a Hitachi external drive, but nothing seems to show up in my computer window. I need to know if there is a way to format these drives to NTFS externally.

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• Ubuntu 9.10 won't reboot after replacing a failed drive

  - by user149041

  Hello Serverfault community. I hope someone can shed light on a peculiar problem I am having with an Ubuntu 9.10 server install. I am not a Linux expert but have the responsibility of fixing the box if something goes wrong. DOH! I have Ubuntu 9.10 server installed on on a desktop platform: Compaq Presario SR5027CL. There are two 1TB SATA drives configured in a RAID 1 array; I use the box as an email backup server for a small group of users. Last week one of the drives failed and was replaced with a new drive of the same type. The problem I have been having is getting the box to reboot after a restart or a shutdown halt. The OS and the RAID 1 array are on the same drives that make up the RAID 1 array. The replacement drive (sda) was added to the box and the partitions were created to match the existing good drive (sdb). The array is made up of sda1 and sdb1. I found an interesting point while checking the BIOS settings: there is a "HDD Boot Group Priority" section, and the new drive was selected as the "1. 3rd master"; the server wouldn't boot configured like that, but when I set the old drive to be "1. 4th master", the box will reboot. I'm checking some more things, but I would certainly appreciate any useful information. Thanks in advance.

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