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• I lost /dev/md2 on my server

  - by sten

  Hi, My 2 hard drives fried at the same moment apparently. My host company rebooted my server in rescue mode and I am trying to recover my data. They told me to mount /dev/sda2 to recover the data I need but, looking at a similar server that I have in pool, the data I'm looking for should be instead in /dev/md2. I can find /dev/md0 but not /dev/md2 (nor /dev/md1). I've looked on several places on the web and I could only find messages explaining how to create new partition. I just need to recover some data, not all of it and I'll be glad if anyone could help me to mount the /dev/md2 folder (or any other trick that would allow me to recover the data that was stored there). Thanks in advance, Sten

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• Turning a running Linux system into a KVM instance on another machine

  - by Charles

  I have two physical machines that I wish to virtualize. I can not (physically) plug the hard drives from either machine into the new machine that will act as their VM host, so I think that copying the entire structure of the system over using dd is out of the question. How can I best go about migrating these machines from their hardware to the KVM environment? I've set up empty, unformatted LVM logical volumes to host their filesystems, with the understanding that giving the VMs a real partition to work with achieves higher performance than sticking an image on the filesystem. Would I be better off creating new OS installs and rsyncing the differences over? FWIW, the two machines to be VM'd are running CentOS 5, and the host machine is running Ubuntu Server 10.04 for no particularly important reason. I doubt this matters too much, as it's still going to be KVM and libvert that matter.

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• Storage sizing for virtual machines

  - by njo

  I am currently doing research to determine the consolidation ratio my company could expect should we start using a virtualization platform. I find myself continually running into a dead end when researching how to translate observed performance (weeks of perfmon data) to hdd array requirements for a virtualization server. I am familiar with the concept of IOPs, but they seem to be an overly simplistic measurement that fails to take into account cache, write combining, etc. Is there a seminal work on storage array performance analysis that I'm missing? This seems like an area where hearsay and 'black magic' have taken over for cold, hard fact.

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• how do I list Distribution Group (List) and their members inside of an OU using AD or exchange 2010

  - by wraak

  our entire domain has thousands of distribution groups, while i can use the script referenced here: How to get a list of all Distribution Lists and their Members in Exchange 2007? to pull all distribution groups and their members, it would be too hard to filter through all results. I particularilly need to pull either a. (preferred) all groups (both distribution and security) and their members inside of an OU (this particular OU contains over 100 hundred groups) or b. all groups and members matching a name starting with exampl* dsquery | dsget looks like could almost serve that purpose however when i did: dsquery group "OU=my-department,DC=blah,DC=blahblah,DC=com" -name * | dsget group -members (-expand) c:\my-department.txt it displays only the members without showing which group they belong to. The output I need should have: group name, members and potentially expanded sub-groups. i am still researching on how to get this done, seems like i can somehow make the above referenced script to search only inside of an OU, but i am not very familiar with powershell. any help would be appreciated, thank you.

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• Using Redirect for an SSL CDN to have a Custom Domain

  - by bendytree

  We're looking to move our website/app assets to a CDN. The problem is, our CDN doesn't offer custom domain names with SSL. In other words, for SSL they offer https://1234.cdn.hostingcompany.com but not https://assets.mysite.com. So this seems like a huge problem since I don't want to re-publish my app with their domain hard coded. So I read somewhere about a method where you send people to https://assets.mysite.com then redirect to https://1234.cdn.hostingcompany.com. Is there merit to that solution or would that completely defeat the purpose of the CDN.

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• Outlook 2013 Win 7 64 bit

  - by Rob P

  I am using Outlook 2013, and on some messages I can see the Other actions > View Source, but other messages I don't see it, I suspect somehow it has been disabled. Any suggestions as to how to see the source? I Tried adding a shortcut to this option to the Quick Bar list, on the messages in question, the shorcut disappears. I have also tried to alter registry, but I don't wnat to. I used to be able to right clight in the message to see the source, why is everything so hard now?

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• Transfer disk image to larger/smaller disk

  - by forthrin

  I need to switch the hard drive on a 2006 iMac to a new SSD. I don't have the original installation CDs. I know I can order CDs from Apple, but this costs money. Someone told me it's possible to rip the image of the old drive and transfer to the new drive. If so, does the size of the new drive have to be exactly the same as the old? If not, my questions are: Is it possible to "stretch" the image from 120 MB disk to a 256 MB disk (numbers are examples)? If so, what is the command line for this? Likewise, is it possible to "shrink" an image from a larger disk (eg. 256 MB) to a smaller disk (eg. 120 MB), provided that the actual space used on the disk does not exceed 120 MB? How do you do this on the command line?

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• How often do netbook parts break?

  - by kurresmack

  I need to know a list of how many percentage of all components break within a year. For example I would need to know how many percent of all netbook RAM is calculated to break within a year? This is a lot to ask, I know. But I really do need to know some facts on what to except to break when you have a lot of netbooks. Would be glad if someone had hard facts that could be backed up with resources. Only netbooks are considered.

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• Controlling access to my API using SSH public key (not SSL)

  - by tharrison

  I have the challenge of implementing an API to be consumed by relatively non-technical clients -- pasting some sample code into their WordPress or homegrown PHP site is probably as much as we can ask. Asking them to install SSL on their servers ain't happening. So I am seeking a simple yet secure way to authenticate API clients. OAuth is the obvious solution, but I don't think it passes the "simple" test. Adding a client id and hashed secret as a parameter to the requests is closer -- it's not hard to do md5($secret . $client_id) or whatever the php would be. It seems to me that if client requests could use the same approach as SSH public keys (client gives us a key from their server(s) there should be some existing magic to make all of the subsequent transactions transparently work just as regular HTTP API requests. I am still working this out (obviously :-), so if I am being an idiot, it would be nice to know why. Thanks!

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• How to disable screens turn off Windows 8.1

  - by Warpzit

  So recently my computer started turning my screen monitors off after a while without activity, if I move the mouse or hit the keyboard they turn back on. I just want them to stay on. My System is windows 8.1 64 bit, I have 2 screens with mini display port and 1 television with hdmi which often is in regular television mode when this issue happens. Now before you jump to conclusions this is what I've tryed: Disabled screen saver Power saving settings to high with following set: Turn of the display: Never Put the computer to sleep: Never Turn off hard disk after: Settings: Never Sleep: Sleep after: Settings: Never Display: Turn off display after: Settings: Never Display: Enable adaptive brightness: Settings: Off Multimedia settings: When sharing media: Settings: Prevent idling to sleep. Any pointers that get me in the right direction will be greatly appreciated.

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• Increase Volume of an MKV Video from Linux Terminal

  - by The How-To Geek

  I've got a large amount of .MKV video files which seem to all play at a very low volume - I end up having to turn the TV up all the way to hear them, which is really irritating when I switch to another channel and wake the dead because it's so loud. What I'm looking for is a command-line method to increase the volume (so I can run it on all of them quickly) that would hopefully work regardless of the audio codec in use in the particular file. (I don't mind hard-coding the output audio though). For reference, I'm using Ubuntu 9.04 on my server, and the files are being played back with Boxee on a Mac Mini, but the volume problem is the same on Windows too.

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• Unattended installation for windows 7 x86

  - by user448402

  Are there any pre-created Autounattend.xml files for Windows 7 unattended installation x86? I have been experimenting and creating the XML file but I am always being prompted to choose which hard disk to format. I can't seem to add in the script to automate that process. I tried adding the DiskConfiguration portion but the installation keeps giving me error that my diskID is incorrect. How do I resolve this issue? Is there any pre-created Autounattend.xml file that automates everything? I want it to work for VMware virtual machine. Currently, VMware creates its own default disk. So RT Seven Lite only works for normal computer and not VMware.

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• NFSv4 with idmap

  - by HTF

  The following errors appear on the NFS server, could you please advise how I can fix this? Details: System: CentOS release 6.4, NFS: nfs-utils-1.2.3-36 # cat /etc/idmapd.conf [General] Domain = domain.com [Mapping] Nobody-User = nobody Nobody-Group = nobody [Translation] Method = nsswitch Sep 3 08:25:28 snode1 rpc.idmapd[1382]: nss_getpwnam: name '0' does not map into domain 'domain.com' Sep 3 08:25:29 snode1 rpc.idmapd[1382]: nss_getpwnam: name '500' does not map into domain 'domain.com' EDIT: 03 Sep 2013 10:41 Please note that I'm using NFSv4 and these errors appear on NFS server only (not NFS clients). Server: # cat /etc/sysconfig/nfs MOUNTD_NFS_V2="no" MOUNTD_NFS_V3="no" ... RPCNFSDARGS="-N 2 -N 3" Clients: # cat /etc/fstab server:/ /data nfs4 defaults,hard,intr,timeo=15,_netdev,noatime,nodiratime,nosuid 0 0

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• Recovering data from a corrupted disk

  - by r_honey

  I use an external harddisk to backup my data (it had 3 partitions). Last week when I plugged it in, the OS (Win 7) hung up and I had to force re-boot the machine. When I turned it back on, the system just did not detect the hard-disk. It was last Sunday and I had to give up after sometime. Now I return back next Sunday (today) and when I plug it back-in to the machine, the OS detects the disk as well as all the 3 partitions on it. But it says all 3 are unformatted and I cant access any of them. Is there any way to recover data from the 3 partitions (I tried PC File Recovery and Recuva from PiriForm but neither detected these partitions).

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• Best ways to move a server room and 80 desktops to a new building

  - by Marko

  Need to plan the best way to physically move a server room (12 IBM x3400 towers) and all associated networking equipment to a new building. Everything is going, comms (80 strong call centre operation), desktops(80-90) the whole lot and has to be done efficiently over a weekend. What I cant seem to find are the best ways to move equipment, i.e is it best to remove hard drives and pack them separetely, do I pack the chassis' with foam and/or surround them in bubble wrap? Are there specific products designed to move computer equipment and where would I find these. The internet has failed me so far, please help

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• hosting website on a private network

  - by razor

  i'm currently running a website off 3 linux servers. I'd like to setup a private network and only allow port 80 traffic to one of the servers. I'd also like to setup a vpn so only I can access the servers via ssh or any port for developing/debugging. How hard is this to setup and what do I need to get? Do enterprise/commercial routers have vpn functionality built in? how do I handle DNS? eg- www.mydomain.com would need to point to the router, which forwards traffic to the webserver. Do I set the A record to the router, and somehow tell the router which server to send the http request to? And how would I make server1.mydomain.com resolve to server1 within the private network (without editing host files)? Would I need to run my own DNS (eg- powerdns?) to do this?

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• USB 3.0 hub; what can it power?

  - by pouzzler

  I own an Asus UX31A laptop, equipped with 2 USB 3.0 ports. I would like to connect several USB devices to one of these ports, using a USB 3.0 hub. 1) Am I correct in assuming the Asus "USB Charger+" commercial blurb corresponds to the USB 3.0 standard "Battery Charging Specification 1.2", and furthermore inferring that the laptop can deliver 1.5A through a USB port? 2) Does a powered external USB 3.0 hard drive draw on the USB power lines? 3) I would like to connect the aforementionned drive, an android phone, and a 200mA rated optical mouse to an unpowered USB 3.0 hub, itself plugged into the laptop. Should my above assumptions be false, would this setup be able to power all three devices? Thanks to the usb guru who'll settle my fears to rest. Best regards, Sébastien

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• FreeBSD Jail own network stack with vimage

  - by bodokaiser

  I want to throw all services from the host system and put them in jails. Unfortunatly this doesn't work for file sharing (e.g. nfsd) because the jails don't have there own network stack by default. I know read something about vimage which would solve this issue. See more in this thread: http://forums.freebsd.org/showthread.php?t=9006 The use of vimage with raw jails should use moreorless but the use with vimage and ezjail makes it hard. Does anyone have experience about this topic and wants to share it? Regards

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• Best linux distribution for Java build server & ...

  - by ashkanr

  Hi all, we are trying to setup a build server for building our Java projects. Following software will be installed: * Subversion * Jira/Confluence/Crucible/Fisheye ... * Bamboo (continuous integration solution) I have 2 questions: 1. Which dist of linux is better suited in your opinion? Our current candidates are: openSUSE, CentOS, Gentoo, Mandriva. 2. Is it possible to build something like an image after finishing setup process and burn it on hard drive for next customers without need to repeat all installation and config process? Thanks in advance,

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• make a folder/partition on one computer appear as a mass storage device to another?

  - by user137560

  Is there anyway to make a folder or a partition on a computer (Linux or Windows) act like a mass storage device to other computers or devices when connected with a Male-Male USB cable? For example, I have a Windows 7 computer with 2 partitions, C and D. I would then connect that computer to another computer or a Smart TV using a Male-Male USB cable, and the other computer or device recognizes a folder/partition on current computer as a mass storage device. Is this possible? If not, is there any USB switch that can connect an external hard drive or flash drive to both a computer and TV without the need to manually switch them? (I know about some USB switches, but they only support automatic switching with some certain types of printers, not with mass storage)

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• Looking for a product configurator

  - by Netsrac

  I am looking for a product configurator for products with high complexity. The main goal is to allow a sales person to configure the product in a correct and working manner. The product is a combination of hard- and software options. The options for sure have dependecies (so option A needs B and C) and can also exclude each other. The performance requirements of the software related to the hardware need to be considered. So some rules need to be defineable. Does anybody know a tool (preferred open source) doing that job? Thanks for your help.

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• How to block a website completely?

  - by user37076

  I want to block some sites(e.g. youtube,news sites ), because I have a problem with procrastination and I find these websites affect my productivity very much. I used to block them by adding them to HOSTS file. However, gradually every time I want to take a break, I open the hosts file and comment my block again. Is there any way I can block the websites and cannot (at least a little bit hard, e.g. I have to reboot my pc) unblock them. I have no access to the router or any firewall, besides the ones on my computer. I just want to FORCE myself to work without any chance to procrastinate.

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• High system cpu load (%sys), system locks

  - by Mark

  For the last two weeks we are having intermittent severe spikes in system cpu usage (shown as %sys), which last for maybe half a minute, locking most processes, including ssh. I've been trying to figure this out, but atop doesn't show anything relevant (system usage for processes it shows is insignificant), spikes are intermittent and I could not reproduce the spike using any workload for the web application this webserver hosts. If you have any ideas on how to debug high %sys and (sometimes) %si CPU usage, please share them. System specs (don't know if any of this is relevant): Dedicated server, CentOS 6, core i7 950, consistent 4 to 8 GB RAM free at any time, hard drives are in RAID-1. Additional info: dmesg output doesn't change between spikes /var/log/messages doesn't change between spikes Here is cat /proc/vmstat Here is output of mpstat 1 during a typical spike Add 07.11.11: looks like simple reboot restored system state, and we might never know what caused the disturbance in first place.

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• ASUS N550 laptop not charging on ubuntu after updating kernel

  - by OBY Trance

  I'm using Ubuntu 13.10 on a pretty new ASUS N550jv laptop. When I was using kernel linux-image-3.11.0-11 everything was quite well (kinda..), however, when I updated the kernel using the automatic update, the kernels which were released afterwards (12+) were faulty on my machine, and caused the battery not to be charged and only stay at their current charging level (even when the machine was off!) The only fix I had was to roll-back to the '..11' version (on boot screen - advanced options), and hard-reboot (AC cord disconnected and reconnected) but now version 14 was released and "pushed away" the good old version 11. How can I fix that?? Please help me...

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• Clean Install Windows on a Acer Aspire Laptop with a Hybrid Drive

  - by user1325179

  I'd like to do a clean install of Windows 8 on my Acer Aspire laptop (Aspire M5-481PT) with a hybrid drive. Physically, there seem to be two hard drives (an HDD and an SSD). So when I try to clean install Windows, I am asked to pick a drive. The HDD has five partitions (some seem to be recovery related), and the SSD has two partitions. Which partitions should I delete (if any), and onto which drive should I install Windows 8? And then how can I instruct Windows 8 to use the HDD-SSD combination as a hybrid drive? Edit: Currently, the operating system seems to be installed (from the factory) on the HDD. The SSD is invisible in File Explorer. It is only visible in disk utilities. I'm betting I need to install Windows to the HDD, and then point Windows to use the SSD for the hybrid relationship. Also, the SSD is about 20 GB. The HDD is about 450 GB.

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