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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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• Applications on the Web/Cloud the way to go? over Desktop apps?

  - by jiewmeng

  i am currently a mainly web developer, but is quite attracted to the performance and great integration with the OS (eg. Windows 7, Jump Lists, Taskbar Thumbnails, etc) something like WPF/C# can provide to the user, improving workflow and productivity. privacy and performance seems like a major downside of web/cloud apps compared to desktop apps. applications on the cloud/web work on the go, increased popularity of smartphones/netbooks majority of users may not benefit as much from increased performance of desktop apps, eg. internet surfing, word processing, probably benefit more from decreased startup times, lower costs and data on the cloud desktop applications increased performance benefits power users like 3D rendering, HD video/photo editing, gamers (i wonder if such processing maybe offset to cloud processing) integration with OS increases productivity (maybe such features can be adapted to a web version? maybe with a local desktop app to work with Web App API) more control over privacy (maybe fixed by encryption?) local data access (esp. large files) guaranteed and fast (YouTube HD fast enough most of the time) work not affected by intermittent/slow/availability internet connections (i know this is changing tho) what do you think?

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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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• custom view on iphone's native media player(MPMoviePlayerController)

  - by sneha

  I am building an application that implements a custom view on iPhone’s native media player. I want your help in deciding directions to lay this effort. At present I have find out that iPhone SDK doesn’t support APIs to customize media player. I need these things in the player: I would like to have custom views i.e. want to change all control buttons on player like Play/Pause, seek bar etc. The background of player will also need to be different. The player has to play audio or video file from local/remote location. Can i use MPMoviePlayerController if it can be customized (How to do it ??). However, any other third party player approved by iPhone which has an ability to download and play the media file from local/remote location is also fine. It will be great to have an access to media player buffer so that it can be encrypted. I have following questions: 1.Any help in building/customizing player..... 2.Do you see issues in signing of application? 3.Does Apple have any restrictions on customizing media player? 4.Any sample iPhone application where media player is customized Any help in this regard is highly appreciated.

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• Links to detailed instructions on building a DIY NAS

  - by Kaushik Gopal

  I'm looking for good links with 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 did a fair bit of searching and found these links (so please suggest others). 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 While these links are great they delve more on the hardware side. I'm looking for more instructions in the software side.

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• WinForms Load Event / Static Initialization Strangeness

  - by Eric J.

  Background I'm troubleshooting an WinForms 2.0 program that's already been burned to CD for distribution to an internet-challenged target audience. Some users are experiencing a fatal error that I can reproduce locally. Reproducing the Error I get the fatal error when I log into my Vista box using a standard user that I just created, even if I run the program as administrator. I do not get the fatal error when I log in as local administrator. I'm not sure that being administrator is necessarily the trigger (since runas did not help). I have reproduced this half a dozen times under each account with consistent results. The faulty code Base.cs (base class for several user controls, only one of which is shown on first screen) private void BaseWindow_Load(object sender, EventArgs e) { // This message shown once in both cases MessageBox.Show("BaseWindow_Load for " + this.GetType().FullName); SkinManager.ApplySkin(this); } SkinManager.cs private static Skin skin = null; public static void ApplySkin(UserControl applyTo) { if (skin == null) { skin = new Skin(SkinsDirectory, "Default"); } } Skin.cs internal Skin(string skinPath, string skinName) { config = SkinConfig.Load(path); } SkinConfig.cs public static SkinConfig Load(string path) { // This message shown only once running as Admin but twice running as standard user System.Windows.Forms.MessageBox.Show("@1"); // !!! LOCK path HERE !!! } A user control loads on the first form, which triggers a call to SkinManager.ApplySkin, which checks if skin is null and, if so assigns it (without thread synchronization or recursion protection), which ultimately causes a file to be opened. When logged in as local admin, that sequence completes just fine. When logged in as my test standard user, ApplySkin is always called a second time while skin is still null, causing a second attempt to load, causing the file to be locked on the second attempt. The error handling is draconian at this point and the program terminates. The Question While this code can be easily fixed, I would like to understand why the error is happening only in some cases.

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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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• 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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• 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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• Private cloud solution [Eucalyptus,OpenStack, Nimbus] for Java deployments [Glassfish, Tomcat]

  - by Tadas D.

  I am interested in a way to have private cloud which would host Glassfish (or Tomcat) server. Which option from Eucalyptus, Openstack or Nimbus would be best to deploy java applications on it? Or maybe there is something other and I am looking wrong at the problem? The way I imagine this, that I should have some shared storage that I could expand by introducing new nodes to this cluster and have easy management for glassfish instances: something like virtual machines images that I can start and stop on demand and that image is shared among nodes. I don't need concrete step-by-step solution here but guidelines how this should be done are very welcome.

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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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• Magento install errors

  - by nXqd

  I try to install new magento version 1.4.xx . But after the config menu I meet after I copy and change local.example.xml to local.xml . Error in file: "E:\Soft\Programming\xampp\htdocs\magento\app\code\core\Mage\Catalog\sql\catalog_setup\mysql4-install-1.4.0.0.0.php" - SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '4-page_layout' for key 'entity_type_id' Trace: #0 E:\Soft\Programming\xampp\htdocs\magento\app\code\core\Mage\Core\Model\Resource\Setup.php(374): Mage::exception('Mage_Core', 'Error in file: ...') #1 E:\Soft\Programming\xampp\htdocs\magento\app\code\core\Mage\Core\Model\Resource\Setup.php(260): Mage_Core_Model_Resource_Setup->_modifyResourceDb('install', '', '1.4.0.0.21') #2 E:\Soft\Programming\xampp\htdocs\magento\app\code\core\Mage\Core\Model\Resource\Setup.php(224): Mage_Core_Model_Resource_Setup->_installResourceDb('1.4.0.0.21') #3 E:\Soft\Programming\xampp\htdocs\magento\app\code\core\Mage\Core\Model\Resource\Setup.php(153): Mage_Core_Model_Resource_Setup->applyUpdates() #4 E:\Soft\Programming\xampp\htdocs\magento\app\code\core\Mage\Core\Model\App.php(363): Mage_Core_Model_Resource_Setup::applyAllUpdates() #5 E:\Soft\Programming\xampp\htdocs\magento\app\code\core\Mage\Core\Model\App.php(295): Mage_Core_Model_App->_initModules() #6 E:\Soft\Programming\xampp\htdocs\magento\app\Mage.php(596): Mage_Core_Model_App->run(Array) #7 E:\Soft\Programming\xampp\htdocs\magento\index.php(78): Mage::run('', 'store') #8 {main} I really need your help , thanks so much :)

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• Eclipse / Aptana File Sync Solutions

  - by Brad

  Our development team uses Eclipse + Aptana to do their web development work. Currently, most of them are mapping their Eclipse projects directly to the web server. I'd rather them create a local project and use that to sync to the web server project directory they are working on. The issue is that there aren't any good solutions which is just appalling given the popularity of the two. The FileSync plugin for Eclipse is only one-way. Meaning if another developer makes a change to the file on the server, another dev isn't even notified and could overwrite the change. The File Transfer option in Aptana 2.0 doesn't support any sort of Sync, just manually uploading/downloading files. The Sync option in Aptana 1.5.1 doesn't allow you to merge files when they are different. You can only update one or the other. It does however allow you to view a diff (but only if you right click and select) and in that diff you can't make any changes. I did find a way to allow files to be uploaded to their Sync repositories in Aptana using Eclipse Monkey. However it doesn't work if a user saves multiple files at once, 'Save All', again it doesn't work. And additionally, there is no notification if a user opens a local file that has an updated copy on the server. I tried to add one using Eclipse Monkey but I couldn't find any sort of listener in the Eclipse API to do it and any Eclipse Monkey documentation is far and few between. My only solution at this point is just to let them continue to map directly to the server or ask them to do a manual download before they do any work (but again what if someone uploads a change right after they do that). Anyone have any ideas?

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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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• Compile MonoDevelop 4.2.3

  - by user2942643

  I need help, I'm trying to compile monodevelop code, but when I use the command "./configure" tells me that I need to have installed a version of mono, but I have it installed [raven@localhost ~]$ mono -V Mono JIT compiler version 3.2.8 (tarball Fri May 30 08:15:47 CDT 2014) Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com TLS: __thread SIGSEGV: altstack Notifications: epoll Architecture: amd64 Disabled: none Misc: softdebug LLVM: supported, not enabled. GC: sgen [raven@localhost ~]$ cd /home/raven/Downloads/monodevelop-4.2.3 [raven@localhost monodevelop-4.2.3]$ ./configure checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for a thread-safe mkdir -p... /usr/bin/mkdir -p checking for gawk... gawk checking whether make sets $(MAKE)... yes checking how to create a ustar tar archive... gnutar checking whether to enable maintainer-specific portions of Makefiles... no checking for mono... /usr/local/bin/mono checking for gmcs... /usr/local/bin/gmcs checking for pkg-config... /usr/bin/pkg-config configure: error: You need mono 3.0.4 or newer [raven@localhost monodevelop-4.2.3]$

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• LogonUser -> CreateProcessAsUser from a system service

  - by Josh K

  I've read all the posts on Stack Overflow about CreateProcessAsUser and there are very few resolved questions, so I'm not holding my breath on this one. But it seems like I'm definitely missing something, so it might be easy. The target OS is Windows XP. I have a service running as "Local System" from which I want to create a process running as a different user. For that user, I have the username and password, so LogonUser goes fine and I get a token for the user (in this case, an Administrator account.) I then try to use that token to call CreateProcessAsUser, but it fails because that token does not come with SeAssignPrimaryTokenPrivilege - however, it does have SeIncreaseQuotaPrivilege. (I used GetTokenInformation to dump all the privileges associated with that token.) According to the MSDN page for CreateProcessAsUser, you need both privileges in order to call CreateProcessAsUser successfully. It also says you don't need the SeAssignPrimaryTokenPrivilege if the token you pass in to CreateProcessAsUser() is a "restricted version of the calling process' primary token", which I can create with CreateRestrictedToken(), but then it will be associated with the Local System user and not the target user I'm trying to run the process as. So how would I create a logon token that is both a restricted version of the calling process' primary token, AND is associated with a different user? Thanks! Note that there is no need for user interaction in here - it's all unattended - so there's no need to do stuff like grabbing WINSTA0, etc.

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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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• 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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• 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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• 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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• 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 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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• 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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• 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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• Java Server Client Program I/O Exception

  - by AjayP

  I made this program: http://java.sun.com/docs/books/tutorial/networking/sockets/clientServer.html And it works perfectly if I put the server's hostname as 127.0.0.1 or my computers name (Ajay-PC). However these 2 methods are LAN or local only not internet. So I changed it to my internet ip. 70.128.xxx.xxx etc. But it didn't work. I checked: canyouseeme.org and it said 4444 was CLOSED. So I did a quick port forward. Portforward: Name: My Java Program Start Port: 4444 End Port: 4444 Server IP: 10.0.0.12 <-- (Yeah this is my Local IP I checked) then I tried canyouseeme.org AGAIN: and it said 4444 was OPEN I ran my server client program and it yet to work. So my problem is the client server program is not working on the internet just locally. So something is blocking it and I don't know what. Computer: Windows Vista x64 Norton AntiVirus 2010 Thanks! I'll give best answer or whatever to who ever answers the best ;) :)

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