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  • Restore data from overwritten LVM

    - by Matthias Bayer
    I lost all of my data (8 TB) which I collected over the past few years yesterday because I made some seriuos mistakes during the remounting of my LVM. I run a XenServer5.6 installation with additional 4 harddisks for data storage. An LVM over those 4 HDDs was used to store all of my data. Yesterday, I reinstalled XenServer and wanted to mount my old Harddrives and add the LVM. I run xe sr-create [...] for all disks (/dev/sdb .. /dev/sde), but that was totally wrong. This command deletes the old LVM on the disks and created an new, empty lvm on every single disk with no partitions. No i got 4 empty harddrives :( Is it possible to recover some data from that lost LVM volumes? I have no clue how to do it because i deleted all informations about the old LVM. Is there a way to access the files insed that old lvm directly?

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  • would unexpected power cuts harm the Linux OS?

    - by Johan Elmander
    I am developing an application on a Linux embedded board (runs Debian) e.g. Raspberry Pi, Beagle Board/Bone, or olimex. The boards works on an environment that the electricity is cut unexpectedly (it is far complicated to place PSU, etc.) and it would happen every day couple times. I wonder if the unexpected power cuts would cause crash/problem on the Linux Operation System? If it is something that I should worry, what would you suggest to prevent the damages on OS against the unexpected power cuts? PS. The application needs to writes some data to the storage medium (SD card), I think it would not be suitable to mount it as read-only.

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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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  • Virtualbox 4 hangs when trying to install ubuntu guest on ubuntu host system

    - by misterjinx
    I'm trying to install ubuntu server using virtualbox 4.0.4 in a ubuntu 10.10 host OS. I have the iso image on my hard drive which I used to perform the install. I edited the settings and added this image at the storage section, selected it as a primary master, so I could boot from it and start the install process. But now, each time I start the installation, at the very beginning or if I'm lucky, after I click on the install link at the welcome screen, the process hangs and all the computer is blocked. This happened 3 times already. I even tried to perform the installation using an old CD I had with the 9.10 server version, thinking that the iso image might be the issue, but the problem still persists. I dont know what could cause this problem. My computer is a dell laptop with AMD processor (I dont know if this is important). Any help is very appreciated.

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  • Are SANs unreliable?

    - by chaos
    So at the place where I wear one of my various hats, this one representing a development rather than admin role, there's been an initiative to move to SANs. So far, I have been spectacularly unimpressed. First it was this behavior where, when MySQL databases are on the SAN, the first few tables that anything tries to hit after the system boots come up as nonexistent and MySQL has to be restarted before it realizes they're actually there. Then today, on multiple systems (including the primary SVN repository, ever-so-wonderfully) we get SAN mounts spewing IO errors and the filesystems going into read-only, which is the kind of behavior I expect from directly mounted naked disks, not fault-tolerant managed storage. Right now, I'm at the point where if I were putting together a project and somebody said "hey we should use SANs", my response would be "GTFO". So basically I want to know whether my experience is typical or even common, or whether I'm having some kind of freakishly bad luck with SANs. The systems these SANs are attached to are all CentOS machines, if that's relevant.

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  • Tabular (X)HTML forms

    - by detly
    I have a set of items that can be in various states. I want to allow a user to use an (X)HTML form to change the state, and easily view the state of a group of objects ...so to this end, I'd like a layout like: | item1 | radio button for state 1 | radio for state 2 | ... | [update button] | | item2 | radio button for state 1 | radio for state 2 | ... | [update button] | etc. I prefer the radio buttons to list boxes so that it's easy for a user to visually scan for things in a certain state. It seemed like perfectly tabular data to me. The only problem is, you can't have forms inside a table that cross table cells (ie. <tr> <form> <td> ... is invalid). I thought, "hey, I could have one giant form wrapping a table, and make the [update button] value contain the IDs for each row!" Turns out certain versions of IE send ALL THE SUBMIT BUTTON VALUES on any single form. So I thought perhaps to to lay it out with <div>s and place the forms inside a single <td>. But then they break a line on each <div>. So I fixed their width and made them float: left. But then they wrap inside the table cells if the table row is wider than the page, and the radio controls don't line up with the headings. Is it possible to lay this out as I intend? The XHTML below shows the intended structure. Observe what happens if you resize the browser window below the width of the table (ideally, the name would break or the table would show a scroll bar). <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head><title>Test</title> <style type="text/css"> .state-select, .thing-state-name, .update { float: left; width: 8em; } .state-select { text-align: center; } </style> </head> <body> <table> <thead> <tr> <th class="thing-name-header">Thing</th> <th> <div class="thing-state-name">Present</div> <div class="thing-state-name">Absent</div> <div class="thing-state-name">Haven't looked</div> </th> </tr> </thead> <tbody> <tr> <td>Apple</td> <td> <form action="something" method="post"> <input type="hidden" name="id" value="1" /> <div class="state-select"><input type="radio" name="presence" value="present" checked="checked" /></div> <div class="state-select"><input type="radio" name="presence" value="absent" /></div> <div class="state-select"><input type="radio" name="presence" value="unknown" /></div> <div class="update"><input type="submit" value="Update" /></div> </form> </td></tr> <tr> <td>Orange</td> <td> <form action="something" method="post"> <input type="hidden" name="id" value="2" /> <div class="state-select"><input type="radio" name="presence" value="present" /></div> <div class="state-select"><input type="radio" name="presence" value="absent" checked="checked" /></div> <div class="state-select"><input type="radio" name="presence" value="unknown" /></div> <div class="update"><input type="submit" value="Update" /></div> </form> </td></tr> <tr> <td>David Bowie</td> <td> <form action="something" method="post"> <input type="hidden" name="id" value="3" /> <div class="state-select"><input type="radio" name="presence" value="present" /></div> <div class="state-select"><input type="radio" name="presence" value="absent" /></div> <div class="state-select"><input type="radio" name="presence" value="unknown" checked="checked" /></div> <div class="update"><input type="submit" value="Update" /></div> </form> </td></tr> </tbody> </table> </body> </html>

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  • How do I built a DIY NAS?

    - by Kaushik Gopal
    I'm looking for good, detailed instructions on how to build a DIY NAS (Network Access Storage). I'm planning on doing it cheap (old PC config + open source software). I would like to know: What hardware I need to built one What kind of hard-drive setup I should take (like RAID) Or any other relevant hardware related advices (power supply, motherboard etc...) What software I should run on it, both what OS and software to manage the contents effectively So the NAS is recognizable and accessible to my network I can make sure my Windows computers will recognize it (when using Linux distro's) I can access my files from outside my network I already did a fair bit of searching and found these links, but while these links are great they delve more on the hardware side. I'm looking for more instructions in the software side. Ubuntu Setting up a Home NAS DIY NAS Smackdown How to Configure an $80 File Server in 45 Minutes FreeNAS Build a NAS Device With an Old PC and Free Software Build Your Own NAS Device

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  • Cannot format SD memory card

    - by cool
    Hello everyone I have a SD memory card which is of local manufacturer it allows to read & copy from it but not write as it is now write-protected so i want to format that card but could not. To format this card I have tried 1) DD command 2) mkfs -f vfat command 3) creating registry entry under storage device policy in window with write value 0 4) disk part command in window to clear attributes in which it show all attributes are clear ie no write protection 5) I format card in windows through control panel - administrative tools- computer management - disk management, then it show as formatted but when I tried to create new partition it give CYCLIC REDUNDANCY CHECK error 6) I downloaded a format utility from transcend site and formatted first it shows write protected again doing format it formats and tells to remove and reinsert after reinsertion it shows the previous data as it is

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  • please explain my fio results - is O_SYNC|O_DIRECT misbehaving on linux?

    - by Zoltan
    I'm going mad over figuring out what the problem could be with one of our storage boxes. With a simple fio script I'm testing random writes using bs=1M and direct=1. The SSD is a Samsung 840pro attached to an LSI HBA (3Gbit/s ports). This is the result I'm getting under FreeBSD 9.1: WRITE: io=13169MB, aggrb=224743KB/s, minb=224743KB/s, maxb=224743KB/s, mint=60002msec, maxt=60002msec This is regardless of sync being set to 0 or 1. On linux, this is the result with sync=0: WRITE: io=14828MB, aggrb=253060KB/s, minb=253060KB/s, maxb=253060KB/s, mint=60001msec, maxt=60001msec and with sync=1: WRITE: io=6360.0MB, aggrb=108542KB/s, minb=108542KB/s, maxb=108542KB/s, mint=60001msec, maxt=60001msec My understanding is that since I'm operating on the raw block device, O_SYNC should not make any difference - there's no filesystem, any barrier, anything between the writes and the drive itself. Especially with O_DIRECT|O_SYNC set. Any ideas? For reference, here's the fio script I'm testing with: [global] bs=1M ioengine=sync iodepth=4 size=16g direct=1 runtime=60 filename=/dev/sdh sync=1 [rand-write] rw=randwrite stonewall

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  • Solaris Administration Web GUI?

    - by Robert C
    I recently installed Solaris 11 x86 text install (http://www.oracle.com/technetwork/server-storage/solaris11/downloads/index.html?ssSourceSiteId=ocomen) to be used as a file server running ZFS. I noticed that I'm given the bare minimum in terms of packages. Is there an official oracle web GUI for managing ZFS? I ran a netstat and it doesn't appear to have installed any webserver thats listening. I saw something from a couple years ago, but apparently it's not packaged or maintained anymore (https://blogs.oracle.com/talley/entry/manage_zfs_from_your_browser). I tried pkg install network-console, but it says that the package isn't available for my platform. Any ideas? I'd like to stick with Oracle Solaris instead of the open source alternatives, if possible.

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  • How do I protect business critical data against fire?

    - by Bill Knowles
    We have 72 hard drives that contain our webcast inventory. The number is increasing. We're located in a frame building and we are afraid of not only fire, but catastrophic fire. I've priced fireproof safes that hold to the required 125F for hard drives. Their price is through the roof. Seems to me if we made backups of each of the hard drives and stored them off-site somewhere, or contracted with an online backup storage company, we might run up a bill buying backup drives that would approach the $7,000 cost of the safe! What's the best way to protect our data from the risk of fire?

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  • How to use multiple SkyDrive accounts on one computer?

    - by user1563721
    Is there any way how to use multiple SkyDrive accounts on one computer running MAC OS X or Windows 8? I would like to sync data from different accounts to different folder and not to merge these accounts to one. The reason is that every SkyDrive has it's storage limits and I'm using every account for different work data. The result should be the following: I have a number of SkyDrive accounts every for different work, let's say: S1 S2 S3 I would like to sync exactly the same number of folders on computer using different accounts to sync them: SkyDriveS1Folder - (folder on computer which syncing the content of S1 SkyDrive) SkyDriveS2Folder - (folder on computer which syncing the content of S2 SkyDrive) SkyDriveS3Folder - (folder on computer which syncing the content of S3 SkyDrive) Is it possible somehow? I found a workaround for Windows machines (http://superuser.com/questions/525932/running-multiple-instances-of-microsoft-skydrive) but is there anything for MAC OS X machines? Or is it possible through any third party application?

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  • Having trouble with Regular Expression and Ampersand

    - by ajax81
    Hi All, I'm having a bit of trouble with regex's (C#, ASP.NET), and I'm pretty sure I'm doing something fundamentally wrong. My task is to bind a dynamically created gridview to a datasource, and then iterate through a column in the grid, looking for the string "A&I". An example of what the data in the cell (in template column) looks like is: Name: John Doe Phone: 555-123-1234 Email: [email protected] Dept: DHS-A&I-MRB Here's the code I'm using to find the string value: foreach(GridViewRow gvrow in gv.Rows) { Match m = Regex.Match(gvrow.Cells[6].Text,"A&I"); if(m.Success) { gvrow.ForeColor = System.Drawing.Color.Red; } } I'm not having any luck with any of these variations: "A&I" "[A][&][I]" But when I strictly user "&", the row does turn red. Any suggestions? Thanks, Dan

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  • Estimate compressed file size in tar.gz

    - by liori
    I've got a set of .tar.gz files, which are duplicity backup files (either full backups or incremental ones). I'd like to compute which directories take the most space on backups. This will most probably be a different figure to calculating which directories take the most space on a live filesystem because I need to account for how often are files changing (and therefore taking space on incremental backups) and how compressible are files. I know that while many other archive formats store compressed files as different entities inside the archive file, .tar.gz files do not, and therefore it is impossible to get an exact amount of storage taken in the archive by a single file after compression. Are there any tools to calculate at least some estimates?

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  • Are xlrd and xlwt compatible?

    - by Leo
    I'm trying to create a workbook with python and I need to test the values of different cells to fill it but I'm having some troubles. I use xlrd and xlwt to create and edit the excel file. I've made a little example of my problem and I don't understand why it's not working. import xlwt import xlrd wb = xlwt.Workbook() ws = wb.add_sheet('Test') ws.write(0,0,"ah") cell = ws.cell(0,0) # AttributeError: 'Worksheet' object has no attribute 'cell' print cell.value I had taken for granted that xlrd and xlwt have shared classes which can interact with each other but it doesn't seem to be the case. How do I get the cell value of an open Worksheet object?

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  • iPhone - Is it ok to override UITableViewCell setSelected:animated

    - by Brian
    I am drawing custom UITableViewCells. My cells are opaque and are completely drawn in the drawRect of the cell to help with performance. I want to handle the look of a selected cell myself. If I don't, then the contents of my cell is covered up by the selectedBackgroundView that is added. Is it common or acceptable to override the setSelected:animated method of my cell so this is done properly. I guess if I did that, then I would not call the super's setSelected method since I would be handling how the cell will show that its selected. I would also have to set the selected property of the cell. Any help would be great. Thanks.

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  • hosting environment for delivering FLVs

    - by Gotys
    What would be the ideal hardware setup for pushing lots of bandwith on a tube site? We have ever-expanding cloud storage where users upload the movies, then we have these web-delivery machines which cache the FLV files on its local harddrives and deliver them to users. Each cache machine can deliver 1200 mbits/s , if it has SAS 8 harddrives. Such a cache machine costs us $550/month for 8x160gb -- so each machine can cache only 160GB at any given time. If we want to cache more then 160gb , we need to add another machine..another $550/month..etc. This is very un-economical so I am wondering if we have any experts here who can figure out a better setup. I've been looking into "gluster FS", but I am not sure if this thing can push a lot of bandwith. Any ideas highly appreciated. Thank you!

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  • How to create a readonly root linux: Can be mounted as writeable for persistent changes?

    - by Mr Anderson
    I'd like a read only file system that runs almost entirely in RAM but the compact flash or hardrive can be mounted and made writeable to make persistent changes. How do I do this on Linux? I've looked at several tutorials but none really explain how to create such a system with the option of being able to mount the storage device and make persistent changes. I looked at this so far: http://chschneider.eu/linux/thin_client/ I also looked on the old gentoo wiki but the article was very specific to Gentoo. I'll be using a debian based Linux but it would be nice I've someone could explain to me how to do this in pretty generic instructions ,that would work on any Linux distro. Thanks.

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  • I want to change hard drive. How to move system partition with Windows 7?

    - by Semyon Perepelitsa
    I've bought a new hard drive and want to move all my data to it. I had no problem with moving all files on non-system partition. But I don't know how to move system partiton. Now I have 3 partitions on the new disk, fist two was created by Windows installation CD (I tried to move system using internal tools, but it didn't work for me), third is filled with my successfully transferred data from old disk. And there are two partitions on the old disk: the first one is system (Windows 7) and the second one is my old main storage, that I already moved to the new hard drive and now it is empty. How can I change the placement of Windows 7 with minimal difficulties and losses, so I could work on the new hard drive just as I did it on the old one?

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  • Looking for FTP server that allows user management from database

    - by hughesdan
    I'm planning a server application that will handle files uploaded via FTP. The application must parse text documents that it receives and write them to a database (most likely a document-oriented database like Mongo). And the application must also relay all large binary files it receives to Amazon S3 for storage and hosting. I'd like to manage all aspects of the FTP server programmatically. For example, when a user registers via a web page the application should be able to create the user account in the database and provision a directory on the server for receiving files. I'm using a Linux server but am otherwise open to considering any programming language or framework. I experimented with VSFTPD but didn't like the way the application relies on config files and the creation of users and directories via the command line. Can someone please recommend what server framework I should consider? I'm a little biased toward solutions that leverage Javascript/Nodejs or Python. However, I'm open to anything that can run on a Linux box.

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  • Will a database server perform better running on 2 CPUs with 16 cores or 4 CPUs with 8 cores?

    - by AlexOdin
    What I have: an online financial application (ASP.NET, C#) at peak we have 5K+ simultaneous users backend is running on Oracle 11g (active server + stand-by using Active Data Guard). At peak - 4K-5K database sessions Oracle is installed on Linux 5.8 (Oracle's unbreakable version) the database size: 7TB disk storage: NetApp (connected with 10GB network) I would like to replace old servers (IT will purchase HP blades BL685C). Servers will have 256GB of RAM. I need your help to figure out what to do with CPUs and cores. Options: 2 CPUs (2.3 GHz) with 16 cores each 4 CPUs (3.0 GHz) with 8 cores each Question: Which one should I pick? P.S. Next year, we will migrate from Oracle to SQL server. I hope, whatever option you recommend will work for both platforms

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  • Ignoring GET parameters in Varnish VCL

    - by JamesHarrison
    Okay: I've got a site set up which has some APIs we expose to developers, which are in the format /api/item.xml?type_ids=34,35,37&region_ids=1000002,1000003&key=SOMERANDOMALPHANUM In this URI, type_ids is always set, region_ids and key are optional. The important thing to note is that the key variable does not affect the content of the response. It is used for internal tracking of requests so we can identify people who make slow or otherwise unwanted requests. In Varnish, we have a VCL like this: if (req.http.host ~ "the-site-in-question.com") { if (req.url ~ "^/api/.+\.xml") { unset req.http.cookie; } } We just strip cookies out and let the backend do the rest as far as times are concerned (this is a hackaround since Rails/authlogic sends session cookies with API responses). At present though, any distinct developers are basically hitting different caches since &key=SOMEALPHANUM is considered as part of the Varnish hash for storage. This is obviously not a great solution and I'm trying to work out how to tell Varnish to ignore that part of the URI.

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  • Moving MODx Files to Other MODx Website

    - by Austin
    I have one website with modx installed to www.website.com/modx/ --- Keep in mind there are other Websites In Progress on this storage server. My issue is that I'm moving all this: templates, template variables, chunks, snippets, etc to another server that already has modx installed in it. My first instinct is to go to phpMyAdmin and export the sql file and import them to the new website's server. However, an error occurred when I attempted to do this. It had found many duplicates in fields that were associated a PK (due to it being the same website just a redesign). I don't have to go and dump the table of the oldsite and then upload the new sql file do i? Please advise.

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  • Innodb : cannot allocate the memory for the buffer pool

    - by mingyeow
    My innodb keeps crashing. This is the error message below. Does anyone know why this keeps happening? InnoDB: by InnoDB 49201616 bytes. Operating system errno: 12 InnoDB: Check if you should increase the swap file or InnoDB: ulimits of your operating system. InnoDB: On FreeBSD check you have compiled the OS with InnoDB: a big enough maximum process size. InnoDB: Note that in most 32-bit computers the process InnoDB: memory space is limited to 2 GB or 4 GB. InnoDB: We keep retrying the allocation for 60 seconds... 0 processes alive and '/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf ping' resulted in /usr/bin/mysqladmin: connect to server at 'localhost' failed error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)' Check that mysqld is running and that the socket: '/var/run/mysqld/mysqld.sock' exists! InnoDB: Fatal error: cannot allocate the memory for the buffer pool [ERROR] Default storage engine (InnoDB) is not available

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  • UITableView resizing rows problem

    - by Vin
    Hi All, Hope to get solution to this problem. I have been stuck on it since a long time now. I have a a tableView which has custom labels drawn upon the cell using CGRect. I receive the data from a web service in arrays. Initially i display a line of data on the cells. When the user selects a cell, I call reloadsRowAtIndexPath to increase the height of selected row. In the process, cellForRowAtIndexPath gets called again. I keep track of this by a flag, and when cellForRowAtIndexPath gets called again, I display the two more lines of data from arrays, on the cell. What i am getting is all overlapping data on one other. I tried to remove already placed labels in didSelectRowAtIndexPath, but to no avail. Please help me on this Thanks in advance.

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