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• Which hard disk drive is which?

  - by djeikyb

  I want to know which hard disk drive corresponds to which device path. It's trivial to match the hard disk stats (brand, size) with the dev path, but I want more. I want to know which drive is which inside my case. What's a good way to go about getting this info? Rules: I am a lazy bum. I don't want to tear apart my server to remove all the drives, then add back one by one. A reboot is acceptable. The drives are inconveniently scrunched together in the case. All label information is hidden. The case can be opened. Most disks are SATA, so theoretically hot swappable. Unplugging cables is fair game. Bonus: For a cli only solution. I'll award answer to the best/easiest gui or cli answer, and give a bounty to the next-best answer of the other kind. Or maybe the other way around, because the bounty is worth more points.

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• Is there a chroot build script somewhere?

  - by Nils

  I am about to develop a little script to gather information for a chroot-jail. In my case this looks (at the first glance) pretty simple: The application has a clean rpm-install and did install almost all files into a sub-directory of /opt. My idea is: Do a find of all binaries Check their library-dependencies Record the results into a list Do a rsync of that list into the chroot-target-directory before startup of the application Now I wonder - ist there any script around that already does such a job (perl/bash/python)? So far I found only specialized solutions for single applications (like sftp-chroot). Update I see three close-votes for the reason "off topic". This is a question that arose because I have to install that ancient piece of software on a server at work. So if you still feel this is off-topic - leave a comment...

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• PARTNER News: Tips and Guidelines from Avago (formerly LSI)

  - by Zeynep Koch

  In this blog write-up we would like to focus our attention to one of our IHV partners, Avago (formerly LSI) . Avago and Oracle have been collaborating at many levels for many years.  At the lowest level, Avago and Oracle engineer solutions to inbox advanced features in our I/O device drivers.  We collaborate to test, verify and optimize these drivers in Oracle Linux with Unbreakable Enterprise Kernel. Both LSI Nytro and Sun F-Series PCIe flash devices are supported inbox in Oracle Linux with Unbreakable Enterprise Kernel. By collaborating early in the engineering design cycle we can find and resolve issues sooner and deliver to the end-customer a fully optimized platform for I/O efficiency and data protection.  Hear more about the partnership and benefits in this podcast  LSI and Oracle Partnership. Avago had also been working on technical whitepaper and video whiteboard to explain some of the optimizations you can achieve by using smart flash cache with Oracle Linux.  Technical Paper: Improve Database Performance Using Sun Flash Accelerator Card, Database Smart Flash Cache and Oracle Linux Video: Improving DB Performance with Database Smart Flash Cache If you want more information about the partnership and product benefits, you can visit the LSI Oracle alliance page. 

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• 64-bit Hardware Virtualization on VirtualBox

  - by Cat

  I am trying to set up a SQL Server practice lab using VirtualBox and a trial copy of Windows Server 2K8 R2 in ISO format. I received an error message that states my processor does not support 64-bit hardware virtualization. Although I "Enabled" Intel ardware virtualization in the BIOS that still doesn't work. According to the Intel website, the processor does support VT-x, however the accelerated tab in VirtualBox is greyed out and no references to VT-x are mentioned in the settings options available to me. Any ideas on how I can get around this? I checked around ServerFault and couldn't find anything but if I missed an applicable post a link is great too. Specs below - if additional information is needed please comment and I will provide. Thanks in advance. VirtualBox version - 4.1.18 Hardware - Lenovo B570 1068-A3U i3-2310M

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• HTML Manifest for Content Folios

  - by Kyle Hatlestad

  I recently worked on a project to create a custom content folio renderer in WebCenter Content. It needed to output the native files in the folio along with a manifest file in HTML format which would list the contents of the folio along with any designated metadata and a relative link to the file within the download.  This way a person could hand someone the folio download and it would be a self-contained package with all of the content and a single file to display the information on the contents.  The default Zip rendition of the folio will output the web-viewable version of the file with an HDA formatted file for each one. And unless you are fluent in HDA or have a tool to read them, they are difficult to consume. I thought this might be useful for others, so I'm posting a copy of the component here. Beyond the standard instructions for installing a component, there is an environment configuration file (folionativezipwithmanifestrenderer_environment.cfg) which has a couple of options. FolioMetadataManifestList - This is a comma separated list of metadata fields (system or custom) that should be included in the manifest file. FolioMetadataManifestUseOriginalFilename - (True or False) If set to True, the filenames in the zip file will be based on the original filename as it was checked into WebCenter Content.  If False, it will use the 'Name' of the item as defined within the Folio.  This is usually the Title of the item. The component also includes the source code, so feel free to use this as a reference for creating other interesting folios. 

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• How do I change the output line length from the "top" linux command running in batch mode

  - by Tom

  The following command is useful to capture the current processes that are taking up the most CPU in a file: top -c -b -n 1 > top.log The -c flag is particularly useful because it gives you the command line arguments of each process rather than just the process name. The problem is that each line of output is truncated to fit on the current terminal window. This is ok if you can have a wide terminal because you have a lot of the output but if your terminal is only 165 characters wide, you only get 165 characters of information per process and it is often not enough characters to show the full process command. This is a particular problem when the command is executed without a terminal, for example if you do it via a cron job. Does anyone know how to stop top truncating data or force top to display a certain number of characters per line? This is not urgent because there is an alternative method of getting the top 10 CPU using processes: ps -eo pcpu,pmem,user,args | sort -r -k1 | head -n 10

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• Installing a new ASP.NET 4.0 site on a Windows 2008 server.

  - by TATWORTH

  I have been specifically requested to blog about getting an ASP.NET 4.0 site working on a Windows 2008 server that has never run a 4.0 web site before. Make sure the 4.0 framework is installed on the server! Patch it will ALL the security patches have been applied. ((for a live server, make sure that you tested the patches on your development server first) You will find the HTTP Log status codes at http://support.microsoft.com/kb/943891 - they are very important in understandign the IIS logs) After installing, turn on 4.0, by doing the following: Start the Internet Information Services (IIS Manager) Select the server node in the connections pane. (this is the node above Application Pools, FTP Sites and Server Farms) Double click the ISAPI and CGI Restrictions item in the centre pane You should see 1 or 2 ASP.NET v4.0.30319 entries, select Enable in the Actions pane for all of them. ASP.NET 4.0 should now run! Remeber after creating your new 4.0 ASP.NET site. select the Sites node and find out the Id of it. By default, the IIS logs are at C:\inetpub\logs\LogFiles and if your site is say 21, then the logs will be created in the W3SVC21 sub-directory. The key point about using these logs is that in the event of an error when trying to start the site for the first time, the log will contain the status code and the sub-code. By having the full code and sub-code, set up issues can be resolved in minutes instead of hours.

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• DNS problems : correct nameserver, namserver working, but not resolving

  - by user1719624

  My problem is as follows. Any suggestions are welcome. [domain].org is not resolving whois and checking the registry information shows that the correct nameserver is set. The primary nameserver is also the server on which domain.org is hosted. The primary nameserver is also used for a number of other domains, and is working fine for those. Logging into the server, I can ping [domain].org and it resolves correctly. Setting the nameserver as my own DNS server on my laptop, and the URL resolves correctly. If the domain has the correct nameserver set, and the nameserver can resolve the URL to the correct IP address, and if I use the nameserver as my DNS then it resolves correctly, AND the nameserver is used for other domains which are resolving correctly, then why isn't it working? NB : this is a new domain registration and has been set up for around 10 days now, so it's not simple slow propagation. Any ideas? thanks

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• Page loading hangs and never times out (Apache)

  - by Lucas -luky- N.

  I have set up Apache2 on a guest Ubuntu 10.04 OS (virtualbox). I have created a "big" HTML file (4MB) with only plain text and when I access a page through my local IP address such as http://192.168.0.100 it successfully loads the entire page. However, when I try to access it through my public IP address the browser loads part of the page and then hangs forever on "loading". I can load a simple webpage though. I'm not sure whether it's an issue with my Apache configuration, Virtualbox, Router or Modem. Any clues? Tried enabling Debug and mod_status but didn't find any useful information.

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• What is the simplest way for a slippy SVG visualization?

  - by totymedli

  I have a big SVG file representing a complicated graph with hundreds of points. I want to represent this in a web page. My idea was that I could make it like Google Maps represent their maps, in those slippy, dragable, moveable maps. I'am looking for an easy and fast JavaScript library which could do the work. What I need for my "map" is the drag/move, zoom ability, and some way to click on the points of the picture, which makes a little information apear about that point, like Google maps markers. I'am looking for a free/open source library. I saw some solutions but I'am uncertain about them, and none of them seemed to be perfet: Polymaps - I love the technique it uses, but I don't know much about this library. Leaflet - I love the simplicity of it, but I dont know how could I apply it for my SVG. Raphael - I heard the awesomeness of this, but It seemed a lots of work to do this task. What would be the best/easiest solution for my problem, and what is your opinion aboute the above libraries?

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• AD Local Admins without password sharing

  - by Cocoabean

  My team is building out an Active Directory environment in a small grad school with support for general computer labs, and staff/faculty machine and account management. We have a team of student consultants that are hired to do general help desk work. As of now we have a local admin account on every machine. It has the same password and all of us know it. I know it's not best practice and I want to avoid this with the new setup. We want to have local admin accounts in case there are network issues that prevent AD authentication, but we do not want this account to be generic with a shared password. Is there a way we can get each machine to cache the necessary information to authenticate a group of local admins so that if AD is somehow inaccessible, student consultants can still login with their AD admin accounts?

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• Mail Secure & Stable Open Source Mail Server

  - by Fanar ALHAYALI

  I have asked question on http://stackoverflow.com/questions/9868426/i-need-to-know-which-email-server-i-have-to-use and someone tell me my question would be better on serverfault. I know that this is a common question and asked many times. but there are so many available mail servers that i am not able to decide the one. Kindly tell that which is the Secure, Stable and fast open source mail server for Centos or Redhat Server. Is there any guide which can be used to deploy the mail server with all its components e.g. smtp, pop3, imap, spam, calender server, antivirus, DNS Setting. Currently I'm using sun messaging V6 which installed on Solaris 10 and my boss ask me to make a report for the best mail server today in the marketing? I tried to have a look on Google but I couldn't find interesting information for my report. Any advice would be appreciated.

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• Which powerful laptop, with UK keyboard and 8gb ram

  - by RobinL

  I've been searching high and low for high spec laptops compatible with Ubuntu. The lack of coherent information on the topic is high (considering the number of people who apparently want a good laptop with an OS operating system). So I thought you may have some advice. My requirements: a) has = 8Gb ram b) is compatible with Ubuntu c) has a UK keyboard and charger d) does not cost the Earth Which would you go for? Does anyone have good experience with high-end laptops running Ubuntu? So here's some background research: Samsung Series 7 looks great, but has various problems on Ubuntu, including: poor battery life, touchpad does not work, graphics card not fully supported and sucks power when it does (see [here] and [here], for example). Other options on the [wish list] include: the sensible [Acer] (possibly n.1 choice, but not sure about graphics card compatibility or battery), a nice looking [HP Pavilion dv6-6c56ea], which also has incompatibility issues (see [here] and [here] and check ubuntuforums) And another [Acer] which may be best due to its simplicity and cheapness. Other sub-questions: didn't Dell offer Ubuntu support for decent laptops (above 6Gb ram their offerings are scarce); what about pre-installed options such as those provided by System76? If it weren't for the UK keyboard and charger, I'd probably go for this [amazing-looking] [machine]. Many thanks for any advice, P.s. Apologies for lack of hyperlinks; I'm a noob so only allowed 2 :( All 10 links are available here though for the interested reader :) Robin

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• Helping to Reduce Page Compression Failures Rate

  - by Vasil Dimov

  When InnoDB compresses a page it needs the result to fit into its predetermined compressed page size (specified with KEY_BLOCK_SIZE). When the result does not fit we call that a compression failure. In this case InnoDB needs to split up the page and try to compress again. That said, compression failures are bad for performance and should be minimized.Whether the result of the compression will fit largely depends on the data being compressed and some tables and/or indexes may contain more compressible data than others. And so it would be nice if the compression failure rate, along with other compression stats, could be monitored on a per table or even on a per index basis, wouldn't it?This is where the new INFORMATION_SCHEMA table in MySQL 5.6 kicks in. INFORMATION_SCHEMA.INNODB_CMP_PER_INDEX provides exactly this helpful information. It contains the following fields: +-----------------+--------------+------+ | Field | Type | Null | +-----------------+--------------+------+ | database_name | varchar(192) | NO | | table_name | varchar(192) | NO | | index_name | varchar(192) | NO | | compress_ops | int(11) | NO | | compress_ops_ok | int(11) | NO | | compress_time | int(11) | NO | | uncompress_ops | int(11) | NO | | uncompress_time | int(11) | NO | +-----------------+--------------+------+ similarly to INFORMATION_SCHEMA.INNODB_CMP, but this time the data is grouped by "database_name,table_name,index_name" instead of by "page_size".So a query like SELECT database_name, table_name, index_name, compress_ops - compress_ops_ok AS failures FROM information_schema.innodb_cmp_per_index ORDER BY failures DESC; would reveal the most problematic tables and indexes that have the highest compression failure rate.From there on the way to improving performance would be to try to increase the compressed page size or change the structure of the table/indexes or the data being stored and see if it will have a positive impact on performance.

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• Bug: unable to handle kernel NULL pointer dereference at

  - by maria

  I have recently installed new system on my disc, Ubuntu 12.04. Installation proceeded without problems, I started installing additional software and put data from other discs. I had already two times bug report, it was quite long, and I have no idea how to acces to log file (which probably is somewhere saved) and since I had to switch off the computer using the button, anything else was possible, here is just a small part of it (what I've noted on paper) could not write bytes: Broken pipe speach dicpatcher disabled: edit etc/default/speach-dispatcher saned disabled: edit .... and than: BUG: unable to handle kernel NULL pointer dereference at 0000009c I've run Memory test in GRUB, everything is fine. First time it occured when I was using rsync, second time when I was trying to install texlive. Should I install whole system once again? Or can it be hardware problem? Or something else? If there is any hardware details which may be relevant, please ask, since I have no idea what is happening, I don't know what kind of information could be useful. Thanks P.S. dmesg output:

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• How to recover data from Dell dimension 9150 RAID 0 on another system?

  - by Adam

  I have a Dell Dimension 9150 which has failed. I'm trying to recover the data. It had two SATA 250GB drives in RAID 0 configuration. I'm trying to use a shuttle PC running Windows7 to recover the data from the drives which contained an XP boot volume. I just want the data, it doesn't have to boot. What program would I need to rebuild / interrogate the drives (one of them is failing the onboard hardware test)? What drivers would I need to install? Windows7 sees the drive as one partition but doesn't see volume information. Ubuntu can see the drive as one partition and also can tell what the drive is called, but can't access the data Any help appreciated!! :)

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• Is it too late to start your career as a programmer at the age of 30 ?

  - by Matt

  Assuming one graduated college at 30 years old and has 5 years of experience (no real job experience, just contributing to open source and doing personal projects) with various tools and programming languages, how would he or she be looked upon by hiring managers ? Will it be harder to find a job considering that (I got this information looking at various websites, user profiles on SO and here, etc.) the average person gets hired in this field at around 20 years old. I know that it's never too late to do what you're passionate about and the like but sometimes it is too late to start a career. Is this the case? Managers are always looking for fresh people and I often read job descriptions specifically asking for young people. I don't need answers of encouragement, I know the community here is great and I wouldn't get offended by even the most cold answers. Please don't close this as being too localized, I'm not referring to any specific country or region, talk about the region you're in. I would also appreciate if you justified your answer.

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• How to check the OS is running on bare metal and not in virtualized environment created by BIOS?

  - by Arkadi Shishlov

  Is there any software available as a Linux, *BSD, or Windows program or boot-image to check (or guess with good probability) the environment an operating system is loaded onto is genuine bare metal and not already virtualized? Given recent information from various sources, including supposed to be E.Snowden leaks, I'm curious about the security of my PC-s, even about those that don't have on-board BMC. How it could be possible and why? See for example Blue Pill, and a number of papers. With a little assistance from network card firmware, which is also loadable on popular card models, such hypervisor could easily spy on me resulting in PGP, Tor, etc. exercises futile.

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• PS2 Eyetoy Recording Quality

  - by Fire

  I have Ubuntu 12.04 LTS and a PS2 eyetoy "Namtai". Don't worry - this is not the sterotypical " how do I get my eyetoy working" question. My eyetoy works fine on Cheese, gucview and various other media software like VLC. However, It seems like I am capped by 25fps. If I recall, the eyetoy is much better than this (~60fps) but cannot find any way to fix this. The best program that I have have found is VLC because its advanced options allow you to change many settings but the framerate setting appears to have no effect. What software or settings can I use to take full advantage of my eyetoy? To give you the full information I wish to attach multiple eyetoys to the system and record from all of them. (Security software like motion and zoneminder, I couldn't get installed correctly on my system- so I haven't tried those yet). edit - I tried the same camera on a Windows system and the frame rate is much better in VLC compared to the Ubuntu system. Mind you with default settings in Windows VLC, the resolution isn't great. However, in Skype for example the resolution is amazing and the framerate is good. It seems there must be some settings I am missing somewhere because it doesn't appear to be a hardware problem...

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• How to specify console (or primary display) for video adapter?

  - by Igor Zinov'yev

  I have an ASUS ENGT440/DI1GD5 video adapter which has three output ports: D-Sub (HD-15), DVI and HDMI. I am using both the D-Sub and DVI ports, but my main monitor is connected to the DVI output. Everything works fine except for which monitor is designated the console during boot. The video adapter seems to prefer the D-Sub output for the console. When both the VGA and DVI monitors are connected, then the VGA monitor always becomes the console which displays the motherboard logo, POST information and booting progress. When only the DVI monitor is connected, then it becomes the console as desired. How do I make the video adapter always use the DVI output (instead of the VGA port) for the console while booting?

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• Internet connection issues after installing Windows Phone 8 SDK

  - by Mosquito

  first of all I must admit, that I'm not good in all this network stuff. I am using Windows 8 OS. On my laptop (Lenovo G570) I have installed Windows Phone 8 SDK and shortly after this I started having weird issues with internet connection. When I start my laptop, internet usually works fine, but after a few minutes it starts slowing down so much, that I'm not able to open a single page. Rebooting doesn't work, after several disabling and enabling network adapter, it usually works again for a few minutes and then again it stops. I'm sure it has something to do with Windows Phone 8 SDK, because problems started with this. With SDK there was also installed "vEthernet (Internal Ethernet Port Windows Phone Emulator Internal Switch)" network adapter. It is worth to note that problems occur mostly in my school network, not at home. Both at home and school I am using Wi-Fi connection. I hope the information given are enough to help me. Thanks in advance for any answers!

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• How to set up strongswan or openswan for pure IPSEC with iPhone client?

  - by Shabbyrobe

  I'm having trouble finding concrete, up-to-date information for how to set up strongswan or openswan to be used by the iphone's VPN client. My server is behind a budget linksys NAT router. I found this, but it mentions a whole bunch of .pem files with no reference for how to create them. Unfortunately, the "fine" manuals for both packages were quite inscrutable and unfriendly to a novice. I've set up OpenVPN before and managed to get serviceable results very quickly, but after a day and a half of reading out of date docs, I barely even know where to start. Any help would be greatly appreciated!

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• I need help with Grub and restoring Windows?

  - by Bob Tahog

  I started out with Windows XP and then I installed Zorin (a sub distro of Ubuntu) and then I installed Ubuntu. This was working great. Then I installed Windows 8 on yet another partition and couldn't get into my other OSs. I asked my tech teacher at school how to fix it and she said just clear the partition that I installed Windows 8 on, so I booted onto a live version of Ubuntu and cleared the Windows 8 partition. Okay then I rebooted and it still went into Windows 8 for some reason. So I got back onto live Ubuntu and it turns out Windows 8 partition didn't clear for some reason so I did it again (and I'm positive it was the Windows 8 partition). I still couldn't fix grub but I needed something out of my XP partition so I mounted it on the live Ubuntu and now all the XP partition have are the folders 'Boot', 'Recovery', 'System Volume Information', 'temp' and the files 'bootmgr', 'BOOTNXT', 'BOOTSECT.BAK' and 'Recovery.txt'. Anybody know how to fix this or what I did wrong? Also, if I try booting from my hard drive it shows the Windows and says 'preparing automatic repair' then 'Diagnosing your PC' then restarts. Any and all help is greatly appreciated.

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• Backing up an rsnapshot directory to a remote device

  - by user123480

  I have a local backup server that uses rsnapshot with hard links that contains about 10TBs of information which add about 4 to 5GBs per day. It's works great. I've been requested to set up and maintain a remote backup of the local rsnapshot directory structure. It's a nightly backup. I've tried using rsync with encryption which takes forever and eats system resources. A previous post says not to use rsync with hard links for that reason. I need a suggestion of how I can keep the local and remote copies of the rsnapshot structures in sync? Thanks

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• Get OpenVPN clients names to resolve through dnsmasq

  - by Fake Name

  I have a PFSense box running as an OpenVPN server. There are several remote devices that connect through the VPN (as tap devices). The VPN stuff is working, I can access the remote hardware by looking up the IP assigned to each device on the PFSense router. What I'd like is to have it so I can resolve the remote hardware addresses via DNS while on the local network. Note that this is only local-network - remote-device (they're backup boxes). I don't need to have the remote devices resolve using the local DNS forwarding agent. I have the rest of the devices on the network that need to be accessible via DNS report their name during the DHCP process. However, the IP assignment for OpenVPN tap clients, while it is dynamic (which is why I need DNS), does not seem to use the local DHCP server. How can I have my openvpn server add information for it's clients to the dnsmask resolver? Is this setup even reasonable (I'm not familiar with openVPN at all)?

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