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• Can installing Linux or Grub make all of my operating systems slow?

  - by Geore Shg

  I installed Linux Mint 64-bit recently but it freezes up all the time. Not only that, but Grub wouldn't detect Windows. I thought it was just an issue with Linux Mint so I booted into Ubuntu - however that froze up as well. I downloaded Fedora to replace Linux Mint with, but that also freezes up. I finally gave up trying to repair Grub, burning a supergrub grub2 disk and using that to boot into Windows. Windows now freezes up as well. I installed a new copy of Windows on a different drive but to no avail. Right before all this started my computer was running very smoothly. I am wondering if the installation of Linux Mint, the reinstallation of Grub, or me messing with the BIOS (when I was attempting to repair Grub) could have done something drastic enough that everything is slow now? I realize that computers get gradually slower over time, but this was in no way gradual and it happened directly after the installation of Linux Mint. If so, what should I do?

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• Using multiple USB webcams in Linux

  - by rachelderp

  Running more than one USB webcam in Debian/Linux results in the the following error: libv4l2: error turning on stream: No space left on device VIDIOC_STREAMON: No space left on device What initially seemed to be a programming issue in OpenCV turned into a quest for a mysterious hardware/software problem after the same errors were produced by running cheese and xawtv. Apparently it's caused by webcams requesting all the available bandwidth on the USB host controller. With that in mind I decided to run wireshark and capinfos to see just how much bandwidth a single camera used. 4 megabits per second at 320x240 14 megabits per second at 640x480 32 megabits per second at 1920x1080 Interesting! That might explain why two cameras at 320x240 work but any higher resolution fails. It's as if my USB controller is only operating at USB 1 speeds, yet lsusb shows both webcams belonging to a device which supposedly supports 480 megabits per second. One solution proposed forcing the webcams to calculate their bandwidth usage instead of requesting their maximum by running the following commands: sudo rmmod uvcvideo sudo modprobe uvcvideo quirks=128 Unfortunately that made no difference, so I decided to try another solution. A post on StackOverflow suggested telling my webcams to use a lower FPS or compressed video format like MJPEG, but after running v4lctl list it doesn't appear either of my webcams support changing their video mode. And that's where I'm stuck. Why would two webcams operating well below the maximum speed of USB 2 would produce this error? ps: It's not a disk space issue, df displays no change when the webcams are started. pps: If it makes a difference, here's the output of lsusb

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• Force Installing a Radeon HD 2100 on Windows 8

  - by Click Ok

  I'm trying force installing a Radeon HD 2100 on Windows 8. I've found that link from AMD with the drivers for Windows7: http://support.amd.com/us/gpudownload/windows/legacy/Pages/legacy-radeonaiw-vista64.aspx I know too that AMD will stop support Radeon HD 400 and older: http://www.techspot.com/news/48321-amd-drops-windows-8-support-for-radeon-hd-4000-and-older.html Now, let's go to the problem. If I try install the 12.6 driver, Windows will stick with the "basic display adapter", and this is bad for 3d games like Minecraft, that runs really slow now compared with the previous Windows7 installation. Forcing install the catalyst driver can help to fix it. So, I follow that steps: Extract the Catalist Driver (C:\AMD\Support\12-6-legacy_vista_win7_64_dd_ccc_whql) Right click the "basic display adapter" on device manager, and "update driver" Search on PC I will choose the driver "With Disk" "C:\AMD\Support\12-6-legacy_vista_win7_64_dd_ccc_whql\Packages\Drivers\Display\W76A_INF" There is a big list of drivers and the nearest driver to HD 2100 is "Radeon HD 2350 Series" My questions: Why isn't "Radeon HD 2100 Series" listed? (or Where is it listed?) In theory it must be listed" The first link above show that "This article applies to the following configuration(s):" (...) "AMD Radeon HD 2000 Series" Am I doing something wrong?

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• Reread partition table without rebooting?

  - by Teddy

  Sometimes, when resizing or otherwise mucking about with partitions on a disk, cfdisk will say: Wrote partition table, but re-read table failed. Reboot to update table. (This also happens with other partitioning tools, so I'm thinking this is a Linux issue rather than a cfdisk issue.) Why is this, and why does it only happens sometimes, and what can I do to avoid it? Note: Please assume that none of the partitions I am actually editing are opened, mounted or otherwise in use. Update: cfdisk uses ioctl(fd, BLKRRPART, NULL) to tell Linux to reread the partition table. Two of the other tools recommended so far (hdparm -z DEVICE, sfdisk -R DEVICE) does exactly the same thing. The partprobe DEVICE command, on the other hand, seems to use a new ioctl called BLKPG, which might be better; I don't know. (It also falls back on BLKRRPART if BLKPG fails.) BLKPG seems to be a "this partition has changed; here is the new size" operation, and it looked like partprobe called it individually on all the partitions on the device passed, so it should work if the individual partitions are unused. However, I have not had the opportunity to try it.

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• Grub Installation Failed: Fatal Error ... now what I do?

  - by eklavya

  I know there are some threads that touch this but I feel I have done something uniquely stupid. hence the post and plea for help. I am a beginner @ Linux. So I have a PC with a HDD (hard disk drive) and SSD (solid state drive) It was running Linux Mint /dev/sda1 - HDD Partition 1 - 2 TB (mounted this is /home /dev/sda2 - HDD Partition 2 - 1 TB (separate back up drive, i was backing up files to this) /dev/sdb1 - SSD Partition 1 - 100 GB (OS) /dev/sdb2 - SSD Partition 2 - 20 GB (Swap) The operating system was Linux Mint and was installed on the /dev/sdb1 i.e the solid state drive. I had partitioned off the sda into 2 TB and 1TB and presented the 2 TB as the /home to the OS. Anyway last night I decided to make a return to Ubuntu via the path of Elementary OS. Everything went fine with the install until it stated that GRUB installed failed and this was a Fatal error (no kidding I said). No I am stuck. I have definitely done something wrong and don't know what it is... My biggest pain is the files on the /dev/sda2. I want to save these before I try something drastic like wiping off the /dev/sda completely. So I have the following questions... Can I use a liveCD USB to save these files ? I can see the /dev/sda2 but was unable to access the files in the liveCD last not least ... how do I fix the main issue here. Why could the OS not install GRUB 2b... why is my SSD the /dev/sdb ... and not /dev/sda. Does that have something to do with it that my master boot record sits on the HDD /dev/sda and not /dev/sdb

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• Can I have a single solid state drive and a RAID array on the same machine? [closed]

  - by jaminto

  Hi- To summarize, i'm looking to use a single solid state drive as my primary drive, and two conventional sata drives in a RAID 1 configuration for data. I am trying to install 64-bit Windows 7 onto this configuration. Is this possible? Here are the details: I built a desktop that has been running 64-bit Vista on two 500Gb in a RAID 1 array for a few years. I just purchased an Intel X25-M 80Gb Sata Solid-State Drive, and was planning on using this a my primary drive, and keeping the RAID 1 array as my data drive. I added the SSD drive and in the RAID setup, configured it as a RAID 0 array of only one disk. Then, I tried to do a clean install of windows 7 64-bit, but got stuck in the "Missing driver for CD/DVD drive" black hole of selecting driver files and Windows telling me that i don't have the appropriate driver for my hardware. The missing hardware is NOT a CD/DVD drive, since i'm installing off of my only CD/DVD drive. Plus at one point i was able to point it at a driver for my raid controller, and then my hard drives magically showed up as browsable sources for finding drivers for some other unnamed device that setup couldn't recognize. After a few hours of trying drivers (this was a very slow process) i decided to reboot and look at the BIOS settings. I'm using an ASUS M2A-VM motherboard which has an ATI SB600 RAID controller on board. I switched the "On board SATA Type" setting from "SATA" to "AHCI" thinking that since AHCI is an Intel thing, this would help. Unfortunately, this abandoned my RAID configuration, and my previously mirrored drives are showing up as separate drives when i boot into my current windows installation. Am i trying to do the impossible here? Should i just buy a separate SATA/RAID PCI card and plug the SSD into that? Any help would be greatly appreciated.

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• What are secure ways of sharing a server (ssh+LAMP) with friends?

  - by Bran the Blessed

  What is the best way to share a virtual server with friends? More precisely, I have the following assets: A virtual private server (Debian Lenny) with root access for myself, running... SSH apache2 mysql Some unused disk space Some friends in need of hosting The problem I would now like to do the following: Hosting one or several domains per friend My friends should have full access to their domains, including running PHP scripts, for example My friends should not be able to poke around in other directories The security of my server should not be compromised by faulty PHP scripts To clarify: I do trust my friends in the sense that they are not trying to do something evil with their access. I just do not trust the programs they are going to run. So, what are your recommendations for establishing such a scenario? Partial solution I already came up with the following plan: Add chrooted SSH users for my friends Add Apache vhosts per user (point the directories to subdirectories of the homedirectories, i.e. /home/alice/example.com, /home/bob/example.net, etc. But how can I enforce a chroot-like environment for the scripts they are running within these vhosts? Any pointers would be appreciated.

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• How to fix Windows 7 when System Recovery Options hangs?

  - by seansand

  The battery power ran out on my HP G60 laptop and it shut down. Even after recharging, Windows 7 will now not start up. After any attempted startup, it bluescreens and takes me to the "Startup Repair (recommended)" / "Start Windows Normally" console screen. "Startup Repair (recommended)" appears to be the right choice, but when I choose it, I get taken to a screen which appears to be System Recovery Options (it's the same wallpaper as the screenshots here: http://www.sevenforums.com/tutorials/668-system-recovery-options.html). However, I just get a cursor with nothing else; no "System Recovery Options" window ever pops up. (A black console screen does pop up for a split-second but too fast to be able to read the text.) The empty screen with cursor hangs indefinitely. System Recovery Options normally runs off of a partition on the laptop hard drive. When I got the laptop, I also created a System Repair Disc (in fact I have more than one) and when I try use any of them; they all result in the same wallpaper and empty screen with lone cursor. Ctrl-Alt-Del does nothing. The computer did not come with a Windows 7 installation disc, so there's no obvious way to reinstall Windows 7. Safe mode does not work; startup fails and I just get sent back to the "Startup Repair (recommended)"/"Start Windows Normally" console screen. "Start in last good state" does not work either, same result as above. Running a memory & hard disk check found no errors. Do I have any options at all? "System Recovery Options" seems to be what I want, but the screen that is supposed to take me to them just hangs.

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• How to improve network performance between two Win 2008 KMV guest having virtio driver already?

  - by taazaa

  I have two physical servers with Ubuntu 10.04 server on them. They are connected with a 1Gbps card over a gigabit switch. Each of these host servers has one Win 2008 guest VM. Both VMs are well provisioned (4 cores, 12GB RAM), RAW disks. My asp.net/sql server applications are running much slower compared to very similar physical setups. Both machines are setup to use virtio for disk and network. I used iperf to check network performance and I get: Physical host 1 ----- Physical Host 2: 957 Mbits/sec Physical host 1 ----- Win 08 Guest 1: 557 Mbits/sec Win 08 Guest 1 ----- Phy host 1: 182 Mbits/sec Win 08 Guest 1 ----- Win 08 Guest 2: 111 Mbits /sec My app is running on Win08 Guest 1 and Guest 2 (web and db). There is a huge drop in network throughput (almost 90%) between the two guest. Further the throughput does not seem to be symmetric between host and guest as well. The CPU utilization on the guests and hosts is less than 2% right now (we are just testing right now). Apart from this, there have been random slow downs in the network to as low as 1 Mbits/sec making the whole application unusable. Any help to trouble shoot this would be appreciated.

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• Install KVM based Windows 2008 remotely over SSH on a headless, no graphics Ubuntu 10.04 server?

  - by taazaa

  Hi, I have a Dell server at a remote data center with Ubuntu 10.04 as the host. It is a minimal install with the necessary virtulization packages. There is no X and the machine is headless. I have the win2008 DVD in the machine and want to remotely install it. I tried: virt-install --connect qemu:///system -n vmwin2k8 -r 1024 --disk path=server2k8.qcow2,size=50 --cdrom /dev/sr0 --vnc --noautoconsole --os-type windows --os-variant win2k8 The qcow2 image get created However I don't understand how to connect to see the install via VNC. This is my first time doing it so it may be trivial or may not be possible. Remotely I have a Win 7 machine with Putty and RealVNC viewer. Where is the graphic output of VNC going? Do I have to have VNC server running on the host or some other machine and then connect to it from my VNC client? Please let me know or point me to the right direction. I have been searching the web for several days to figure out how this is suppose to work. Thanks!

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• Connections to IIS sometimes get stuck in CLOSE_WAIT state

  - by randomhuman

  Our application includes an ASP.Net web service that only needs to deal with a handful of clients. As such, the 10 incoming connection limit of Windows XP Pro is generally not a problem. However, on one particular server, connections are occasionally becoming stuck in the CLOSE_WAIT state. These connections build up over time and eventually new client connections are refused because the maximum number of connections are used up. From my googling it sounds like a failure of the webservice to properly close the connection can cause this problem, but as it works just fine on hundreds of other Windows XP pro machines I can't see it being a bug in our code. It also ran fine on the affected machine until some shenanigans on the part of the end user (I think they set about deleting duplicate files in order to reduce their disk usage, but they did not exactly come clean about it). What could the user have changed to introduce this problem? Is there any way I can force connections that are in CLOSE_WAIT to time out rather than letting them hang around? I have seen suggestions to reduce TcpTimedWaitDelay, but that only relates to the TIME_WAIT state, and changing it did not have any effect.

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• Partitioning of Ubuntu server which will use OpenVZ and encrypted partitions (unlocked through SSH l

  - by DeletedAccount

  Hi, I'm about to install a server. Some context: My HDD is 1 TB and I have 2 GB RAM Ubuntu Server Lucid Lynx AMD 64 I will use OpenVZ and have most functionality separated into containers. To support disk quotas I need to use ext3 (not ext4) for the container partition. Each time I reboot the server I want to be forced to login through SSH and mount the encrypted partitions by typing my password (if someone steals the server, no critical data should be available). I want to have as much as possible encrypted. Yet I want to be able to login through SSH as I don't have a monitor or keyboard at the server. I am not sure how big I need my partitions to be. Being able to resize them later would be nice. I guess it implies using LVM? But the manual partition mount using SSH is also very important (in fact it's more important, if I have to pick one). How do you recommend that I partition the HDD? If I have daemons which needs the encrypted partitions, will they fail and can I just restart them after mounting the needed partitions?

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• Install Windows 8 on SSD and Program & Users on HDD

  - by Foe

  I have been dealing with a few problems while installing Windows 8 on my computer. On my old configuration, I had Windows 7 installed on my 60Go SSD, and my programs and user data on my 1To HDD, thanks to relative links. Yet, while installing Windows 8 on my SSD, he made a small partition on my HDD "System related". Plus, I'm afraid using only links is a bit cheap, and I saw lots of people messing with their registry when trying to put user data on another drive. I read a lot about optimizing Windows 8 for SSD, putting Users on another drive, and very similar situation that didn't quite correspond to what I was trying to achieve. Here's what I tried : http://www.eightforums.com/tutorials/4275-user-profiles-relocate-another-partition-disk.html Booting on Audit mode and using an XML to relocate Users didn't work as the specified version in the file is a test one, and I don't what to enter if I'm using the last release. Booting with the install DVD in repair mode to do a copy of the User and create a relative link, resulting in an error on the logon screen while entering my password saying that "The profile can't be load" (average translation of my error from french to english) Do anyone know how to do a clean separated install of Windows 8, with OS on a drive, and the other data on a second one ? Thanks.

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• Ubuntu 12.04 VirtualBox on powerful W7 quite slow

  - by wnstnsmth

  I own a Thinkpad T420s with 8GB RAM, 160 GB SSD and a quite fast i7 processor. Summa summarum a very fast computer that works perfectly. Now, I am not very impressed by the performance of my Ubuntu 12.04 virtual machine running on VirtualBox 4.1.18. I assume that Virtual Machines are always a bit slower than the guest system, still I think it should be more performant given the hardware settings I give it: 4096 MB RAM 1 CPU without CPU limitation (I would like to give it more but then it does not seem to work - I am not experienced in this maybe somebody could give me advice on this too) Activated PAE/NX, VT-x/AMD-V and Nested Paging 96 MB Graphics Memory (no 2D or 3D acceleration) ~ 14 GB disk space, currently about 7 GB are used Maybe I misconfigured something, could you give me a hint please? Thanks! Edit: What I mean by slow is that for example switching tabs in the browser (whether FF or Chrome) only goes with a 0.5s delay or something, as well as switching application windows and/or double-clicking applications in the dock to get all open windows.. opening Aptana takes about a minute whereas opening something like Photoshop on the guest system takes 5 seconds

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• Failed Software RAID0 on Linux - Attempting to recover data

  - by Gizmo_the_Great

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

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• Role of MBR in the booting process

  - by pg4421

  I am new to stack overflow. So please correct me if my question seems irrelevant or stupid. I read here in Booting Process : The job of the primary boot loader is to find and load the secondary boot loader (stage 2). It does this by looking through the partition table for an active partition. When it finds an active partition, it scans the remaining partitions in the table to ensure that they're all inactive. When this is verified, the active partition's boot record is read from the device into RAM and executed. The question is that I am having a Hard disk which has two Operating System images windows and ubuntu and hence both partitions in which they reside are active. Then why do we have only one active partition always? (I know that active partition is one of the primary partition but then why we are giving special reference to one primary partition? ) I am confused a bit. Please solve my query. Thank you so much.

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• Shared External Drive Permission Issues

  - by connec

  So, say I share my system (C) drive through windows (E.g. properties -> Sharing -> Advanced Sharing -> Share this Folder). I can then access this drive at \\Comp\C on another networked computer - all is well. However, if I insert a removable (USB) disk, say "E", and proceed to share it the same way, when I attempt to access \\Comp\E (either directly or through browsing) I get an error: Windows cannot access \\Comp\E You do not have permission to access \\Comp\E. Contact your network administrator to request access. Now, the permissions (Advanced Sharing -> Permissions) are set with "Everyone" having read access (same as the internal drive), so this doesn't make a lot of sense. Also of note, I have an SSH server on my computer (through Cygwin) and even through SSH (logging in as an administrator user) I cannot access /cygdrive/e (although /cygdrive/c is accessible). As a final note, the drive is of course accessible on the host machine (E:\), and also at \\Comp\E on the host machine.

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• [SOLVED} How do I restore my audio after uninstalling Ventrilo?

  - by Marcx

  Hi, I've a Dell studio 1555 bought on september with Windows 7 64bit Professional on it. The audio device works proprerly, while listening to audio contents (from disk or internet) When I use Ventrilo, the audio from other people sounds good and I hear their voices clearly When I use any other VOIP programs like Teamspeak 3, MSN or Skype, I hear a disturbed voice, and it's impossible to comprehend something... Anyway everything worked fine until I installed Ventrilo, but removing it didn´t solve my problem. Update: Here's a sample of how I hear others people voices.. Audio Sample After some tests, also the desktop has the same problem. (I tried TeamSpeak3) Here are some details on my laptop and desktop Laptop Dell Studio 1555 Core 2 Duo P8600 2.4Ghz 4Gb Ram Dual Channel Ati HD 4570 512Mb dedicated (up to 2048) IDT High Definition Audio Desktop Motherboard Asus P5KPL-AM Dual Core CPU E5200 2.50Ghz 2x2GB PC6400 Dual Channel Ati Radeon HD 4650 512MB VIA High Definition Audio Both computers have Windows 7 Professional 64Bit. So how do I restore my audio? SOLVED The problem was in router firmware, there was a bug that recognized VoIP traffic as a DOS attack and the router grambled every packet... I've installed the newest firmware and everything is fine :)

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• thought about shared storage (NFS, Lustre) [closed]

  - by user134880

  Possible Duplicate: Can you help me with my capacity planning? Now I habe small cluster with total of 8 nodes. 6 of them are computing nodes (apache and vmware) and 2 nodes are for storage. 2 storage nodes are identical. Each storage server is linux box with 8 x 1Tb WD RE4 in soft raid 10. 1st box is master and 2nd is slave. Data is mirrored with DRDB. We export NFSv4 shares to Apache (for document root) and iSCSI to Vmware. Now all is working pretty good and stable. But it will be soon time to upgrade our system. I have been thinking of Lustre. Does some one has any real experience with Lustre or NFS medium clusters? Will it be good idea just to upgrade server and change hdd's to 3Tb ? With NFS we will always have only 2 servers to maintain (one primary and one slave). Thanks. QUESTIONS: 1) Does some one used Lustre? In production? I have seen a lot of info about how it is hard to setup Lustre because you need to compile own kernel and patches. It's answers from newbies. Is there some one who has used Lustre for some period of time? 2) About disk upgrades - it's only description of strategy. I'm not asking if it is enough 3Tb or not. I just ask if it is right just to replace hdds instead of adding new server (like with Lustre) Thanks again.

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• Swapping RAID sets in and out of the same controller

  - by hazymat

  This is a really simple question, and the answer is probably encoded in various wikipedia articles, however my question is reasonably specific, and I need a bulletproof answer! I'm not sure if my question pertains to hardware RAID in general, or to the specific RAID controller I'm working on. Either way it is the Dell SAS 6/iR (this is an LSI sas1068e chipset). I simply want to: remove a set of striped (RAID 0) disks from this RAID controller in a server put in another set of disks, and create a RAID 1 array (or create a new 'virtual disk', as they call it in the SAS 6/iR manual) Do stuff with the new RAID 1 array Have the option of putting back the old set of disks (the RAID 0 striped ones) I am quite sure this is possible, but I need some form of reliable, evidence-based answer as it's for a client of mine, and I need to migrate their data safely. The question: can I actually do the above? Does the RAID configuration get stored on the disks themselves, or in the hardware controller? Is any data stored in the hardware controller? If there is any chance I cannot completely restore operation of the first set of disks I removed, then I need to know about it! The manual alludes to the answer to this question (see page 45 of this document), and talks about activating an array of disks. I just need someone to confirm I can definitely do the above. See, simple question, right? :)

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• Fedora Core 6 Migration

  - by Matthew Sprankle

  I am at a loss as to what I should to for this server. I need it to run php5.3 and corresponding version of mysql. I received a client today through work that is using Fedora core 6 running 10 very small websites on some very hodge podge setup. My original idea was just upgrade to php5.3. I have yum (installed 3.0.8) reconfigured for the fedora archive. The latest version of php it allows is 5.1.8. I am still relatively new to server setups and am nervous about wiping their server to upgrade it. Since it is about 6-8 years old I'm not sure if it will even support the newest version of fedora. The server specs are: Parallels Plesk Panel version 9.5.4 Operating system Linux 2.6.9-023stab048.4-smp CPU GenuineIntel, Intel(R) Xeon(R)CPU E5335 @ 2.00GHz (10gb disk space and 1gb of memory). I use fedora for my personal server so I was a little familiar with it. I haven't done anything too extravagant. Is there a way I can escape this nightmare with installing php5.3 or do I need to migrate these sites to a new server?

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• How to "open" existing VMs in Hyper-V without importing them?

  - by Borek

  I had a PC with two physical disks: C: containing the host operating system D: containing a folder D:\VMs where all my virtual machines were stored Now, the C: disk died. I bought a new one, reinstalled Windows on it, enabled Hyper-V feature and now I just need to open the VMs from the D:\VMs folder. However, I don't seem to be able to find a menu item or anything that would allow me to do that - the only thing I see is the "import" command which unfortunately requires the VMs to be explicitly exported (my machines weren't). I firmly believe that when I have all the files constituting a VM (the VHD file, some XML files describing the settings etc.) it must be somehow possible to just "open" these existing VMs in Hyper-V, right? What command am I missing? Edit: I know I can create a blank virtual machines and then just point them to use existing VHDs. However, I am not sure about all the different settings I've made to those VMs so I hope there's a way to simply open those existing VMs instead of recreating them.

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• Automatic switching of network card when vm is moved

  - by spock

  I have two hosts in a pool and I used to be able to move the vm around and they will start without any problem. But after I played around with some network setting, which I don't remember what, I started getting "This VM needs storage that cannot be seen from that server" message. As you can tell I am a beginner with Xenserver. Here is the very simple environment: 2 host servers with their own local hard disk and network card. One is a Pool master. Problem: Power off a vm and move vm from one server to another, or clone one vm to the other server. It used to be able to start up right away. Now, I need to delete one of the network that does not belong to the server, then it will start. Otherwise, the above error msg popup. The two networks (one for each network card in each host) are in the Networking tab of the vm, as well as in the host's networking tab. I googled but all I got to empty the DVD drive, which is not the problem here. Thanks in advance!

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• How to reduce memory consumption an AWS EC2 t1.micro instance (free tier) ubuntu server 14.04 LTS EBS

  - by CMPSoares

  Hi I'm working on my bachelor thesis and for that I need to host a node.js web application on AWS, in order to avoid costs I'm using a t1.micro instance with 30GB disk space (from what I know it's the maximum I get in the free tier) which is barely used. But instead I have problems with memory consumption, it's using all of it. I tried the approach of creating a virtual swap area as mentioned at Why don't EC2 ubuntu images have swap? with these commands: sudo dd if=/dev/zero of=/var/swapfile bs=1M count=2048 && sudo chmod 600 /var/swapfile && sudo mkswap /var/swapfile && echo /var/swapfile none swap defaults 0 0 | sudo tee -a /etc/fstab && sudo swapon -a But this swap area isn't used somehow. Is something missing in this approach or is there another process of reducing the memory consumption in these type of AWS instances? Bottom-line: This originates server freezes and crashes and that's what I want to stop either by using the swap, reducing memory usage or both.

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• 2.6.9 Kernel on virtual server (non upgradable) - any expected problems?

  - by chris_l

  Hi, I'm considering to rent a virtual server (for me personally). The product I'm currently looking at offers IMO fair pricing, very good hardware etc. The only problem is, that I won't be able to do an upgrade to a newer kernel than 2.6.9 (running Debian Etch). Also, I can't install my own kernel modules. (The server runs with Virtuozzo, so as far as I understand it, it just does some chroot instead of a real virtualization (?)) I want to run GlassFish, Postgres, Subversion, Trac and maybe some other things on it. It will also have to employ a firewall, and provide OpenSSL for https. Ideally, it would also be able to do AIO (asynchronous IO), which could speed up some server I/O. Should I expect problems with that old kernel version, in conjunction with the software I want to install (I'd like to use current versions of the software)? One thing I already found out, is that you can't do everything with iptables, since some kernel modules are missing/things are not build into the kernel. GlassFish v3 appears to run fine at first glance. I was able to test the server for a few hours. Installing my whole setup wasn't feasible in that time, but what I can say is, that it's amazingly fast for an entry-level vserver, especially hard disk and network performance (averaging at ca. 400MBit/s). So if the kernel won't be a problem, I'd really like to take it. Thanks, Chris PS Exact kernel version: 2.6.9-023stab051.3-smp

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