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• (simple) linux HA with vmware vsphere?

  - by derhelge

  I hope my upcoming question is specific enough, and you are able and willing to support :-) We have several openSUSE VMs in an ESX-Cluster (three ESX-Servers) with an attached iSCSI-SAN. All of those Linux VMs are "single point of failure"-configured, which means in the case of a Web-Server: LAMP, storage, etc. everything on this machine. This was very simple and in case of a failure (in the last years: kernel panics or apache crashes) a simple reboot triggered by a script did it. But the problem is: How to upgrade/maintain the w(eb-)application or the underlying OS without downtime? This wasn't really managable and i did this in the early morning ;) How can i achieve a "simple" High-Availability Cluster now? I thought of: DRBD with heartbeat with 2 VMs. And for the storage a RDM (raw device mapped) LUN and change the read-write-permissions for both VMs. Is this a good idea? Anyone has a better solution?

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• NFS-Root not working when booting over PXE

  - by Randy

  I am desperately trying to get a diskless client running over PXE-Boot using a NFS-Share as a root file system. I did this before some years ago but for some reason I am stucked at this since days. The TFTP-Server itself is running fine and booting a netinstaller works also fine. The kernel and initrd are loaded also but the bootprocess stops with this (screenshot) kernel panic. I'm using the squeeze standard i386-Kernel and I have prepared the initrd with this config: MODULES=most BUSYBOX=y KEYMAP=n COMPRESS=gzip BOOT=nfs DEVICE= NFSROOT=auto I also tried MODULES=netboot with the same outcome. My PXE-configuration looks like this: LABEL linux KERNEL diskless/debian-default/vmlinuz-2.6.32-5-686 APPEND root=/dev/nfs initrd=diskless/debian-default/vmlinuz-2.6.32-5-686 nfsroot=192.168.140.2:/storage/nfs-boot-images/default-squeeze ip=dhcp rw Furthermore I have captured the network communication of the client via tcpdump and learned that the client isn't even trying to connect to the NFS-share. Does anybody has got an idea what is going wrong here?

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• Windows 7 USB power lose after a few seconds / minutes

  - by Stefan Dunn

  My friend's computer has a problem where the USB ports causes problems with the power of some devices connected to the computer. The USB mouse has no problems, however the Wireless Adapter looses power after around 20 seconds of use and USB Flash Drives cause the computer to either freeze, lose power (and become unresponsive) or become disconnected (still shown in Device Manager, but not in My Computer) when trying to transfer any type of file to / from the computer. I have a suspicion it's the Motherboard but could it also be a Software problem? Tried a new case, RAM, CPU and GFX Card which had no effect. The problem occurs on both the Front USB and Back (Motherboard) USB Ports. UPDATE: Tried the USB devices with an Ubuntu Live CD and they work fine, could this mean it's a problem with Windows (x64)?

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• Windows 7 backup to 3TB Seagate external drive got 0x8078002A error [migrated]

  - by Zhang18

  I'm using the Windows 7 backup and restore utility to create a system image and personal file backup to an external Seagate GoFlex 3TB disk. I got the following error: One of the backup files could not be created. Details: The request could not be performed because of an I/O device error. Error code: 0x8078002A I searched all over the internet and found these two related discussions (discussion 1 and discussion 2). Note the 1st discussion is for a Western Digital drive, which seem to have a solution with the WD Quick Formatter tool. But I downloaded that software and it cannot detect my Seagate drive. The 2nd discussion is directly relevant but it does not offer a solution. I've spent days on this and am at a loss... Please help if you know what to do to make it work! Thank you!

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• Apache is running; however, it reports that it is not, and it will not restart.

  - by solo

  Apache is running; however, it reports that it is not, and it will not restart. # /etc/init.d/httpd status httpd.worker is stopped # /usr/sbin/lsof -iTCP:80 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME httpd.wor 1169 root 3u IPv6 2974 TCP *:http (LISTEN) httpd.wor 1211 daemon 3u IPv6 2974 TCP *:http (LISTEN) httpd.wor 1213 daemon 3u IPv6 2974 TCP *:http (LISTEN) httpd.wor 1215 daemon 3u IPv6 2974 TCP *:http (LISTEN) httpd.wor 1352 daemon 3u IPv6 2974 TCP *:http (LISTEN) #/etc/init.d/httpd restart Stopping httpd: [FAILED] Starting httpd: [Wed Mar 24 10:33:51 2010] [warn] module proxy_ajp_module is already loaded, skipping (98)Address already in use: make_sock: could not bind to address [::]:80 (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs [FAILED] OS: Linux DISTRO: CENTOS 5 Restarting the server didn't help, nor did killing apache and starting it. Any idea what is causing this inconsistency?

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• Virtual fiber channel HBA in Solaris

  - by Phil

  We are trying to set up some virtual Fibre Channel HBA's in Solaris. This seems to be possible with NPIV. Creating NPIV's in a Solaris global zone works fine, but passing that NPIV to a zone didn't work at all. We tried to pass the NPIV as following: # zonecfg -z zone1 'info' zonename: studentz1 [...] device: match: /devices/pci@0,0/pci8086,25f9@6/pci8086,350c@0,3/pci1077,140@4/fp@1,0:devctl allow-partition not specified allow-raw-io not specified Wat we want to do is, set up an environment for SAN exercises. We don't have a physical host per student, so we try to virtualise that in some way (Solaris zones or VMware). It should be possible to display the WWN of the virtual HBA and mount the storage presented by the disk subsystem. Any ideas to pass the NPIV to a solaris zone or to virtualise this with vmware?

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• "Boot has failed, sleeping forever." Suggest some solution for this.

  - by Lazer

  I downloaded Fedora from here. While trying to install it, I am getting this error: No root device found. Boot has failed, sleeping forever. I tried searching on it (found codehead and fedoraforum) and came to know that it is a known bug, but couldn't find any solution to it. Do you know any solution to this? OR Do you know a distribution of Fedora that does not have these problems? [I am trying to install Fedora on my Windows Vista machine]

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• How to install Windows 8 from Ubuntu without a USB or DVD?

  - by 0xEDD1E

  Last week my windows 7 operating system crashed. So I installed Ubuntu 10.04 on the partition Windows 7 was previously on. I have two Partitions, C: and D:. In partition D: I have very important data and I can't format it (I can't backup because it's very heavy ~50 GB). Now I want to install Windows 8. I have downloaded the ISO file of Windows 8 Pro. I don't have a DVD writer or a USB device to Install this. I need to install this on C: partition (the partition on which I have already installed Ubuntu) and I need to protect the data in partition D:. How do I do this?

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• Where does power consumption go in a computer?

  - by Johannes Rössel

  Today we had a weird discussion over lunch: What exactly causes power consumption in a computer, particularly in the CPU? Figures you usually see indicate that only a percentage (albeit a large one) of the power consumption ends up in heat. However, what exactly does happen with the rest? A CPU isn't (anymore) a device that mechanically moves parts, emits light or uses other ways of transforming energy. Conservation of energy dictates that all energy going in has to go out somewhere and for something like a CPU I seriously can't imagine that output being anything but heat. Us being computer science instead of electrical engineering students certainly didn't help in accurately answering the question.

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• kernel: journal commit I/O error

  - by jasondewitt

  I am having some problems with a Dell 1950 server. I am installing RHEL 4.6 along with Oracle and some other software on here. I am randomly getting an error message saying "kernel: journal commit I/O error" on my ssh session and on the monitor I have hooked up to the server I see an error scrolling by that says "EXT3-fs error (device sda5) in start_transaction: Journal has aborted." It has happened several times but never at the same point during the install. Actually, this last time the system was up and running and I was just trying to import a database into oracle. This has happened on several hard drives, so I'm pretty sure that is not the problem. This makes me think the raid controller is going bad. What do you guys think? ** UPDATE ** Pretty sure it was a bad hard drive. I threw another drive in the server and it's been running for about 48 hours with out problems.

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• How to convert PowerPoint presentations into a Kindle/E-reader friendly form?

  - by Shiki

  I have a lot of documents in .ppt and .pptx (blame the co-workers). I would like to read them on way home or elsewhere... when I have a little time to catch up with things. One thing I could do with the documents is cutting them together into one file. But saving that one even if a smaller version of PDF (according to Office 2010) results in a huge file. And PDF is hardly readable on a Kindle. I would need something .epub free, easy-on-the-device way. Is there such a thing? (Manually I could copy all the images down into native text and whatnot and create new presentations, save those, convert them. But that would just take a lot of time.)

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• Formatted USB flash drive with Disk Utility on Mac and now it is not recognized on any Mac or Windows machine

  - by Željko Filipin

  I have formatted Canyon CN-MP4A USB flash drive with Disk Utility on Mac and now it is not recognized on any Mac or Windows machine. I have formatted with Disk Utility > drive > Erease > Format > MS-DOS (FAT). Now when I plug it in any Mac or Windows machine, nothing happens. Like nothing is plugged in. It has a screen, and I was able to format it directly from the device before, but now when I turn it on, welcome screen appears, but nothing else. I can not get to the menu. Is there a way I can format it? I am looking for the answer on the internet, but no luck so far.

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• How can I apply a DSP to my microphone in windows?

  - by user16315

  I'd like to be able to run my microphone through arbitrary DSP filters--Mostly for compression and amplification, but also noise cancelation would be nice. I'd then like to take that output and put it back in a virtual audio device that I could use as input for skype, mumble, teamspeak, or any other VOIP program. With a program like Virtual Audio cable, I can do the 'fake devices' part but as far as I know it does not allow any kind of filtering inline. Does a program like this exist? Or some combination of programs that can be combined to accomplish this?

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• Compiling the Linux kernel, how much size is needed?

  - by ant2009

  I have downloaded the newest most stable Linux kernel, 2.6.33.2. I thought I would test this using VirtualBox. So I create a dynamically sized harddisk of 4 GB. And installed CentOS 5.3 with just the minimum packages. I setup the make menuconfig with just the default settings. After that I ran make and got the following error: net/bluetooth/hci_sysfs.o: final close failed: No space left on device make[2]: *** [net/bluetooth/hci_sysfs.o] Error 1 make[1]: *** [net/bluetooth] Error 2 make: *** [net] Error 2 The amount of space I have left is: # df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 3.3G 3.3G 0 100% / /dev/hda1 99M 12M 82M 13% /boot tmpfs 125M 0 125M 0% /dev/shm My virtual size is 4 GB, but the actual size is 3.5 GB. $ ls -hl total 7.5G -rw-------. 1 root root 3.5G 2010-04-13 14:08 LFS.vdi How much size should I give when compiling and installing a Linux kernel? Are there any guidelines to follow when doing this? This is my first time, so just experimenting with this.

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• Blackberry Enterprise Server - Not running?

  - by TheWellington

  My BlackBerry enterprise server recently stopped forwarding messages to devices. In fact, the server claims that the last time it communicated with all the devices associated with it, was on Thursday night (4 nights ago.) The catch is this, the Exchange server is running properly (or as properly as Exchange can run :) ) The SQL server seems to be running properly. And the Blackberry Enterprise server seems to be running correctly. Other than the fact that the server has not communicated with any device since Thursday, and the fact that I am not getting messages, there appears to be nothing wrong. How do I get these message to be forwarded to devices again? I have restarted the BES services in the order suggested by the BlackBerry folks to no avail.

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• External Hardrive Not Reconized on Windows 7 at all

  - by Bella

  I Have a NextStar 2/5" from Vantec and its an 80G HD. I have used it many times on windows xp and it works fine. We just recently upgraded to windows 7 home premium and when I plug it in it beeps many times. I've tried all the USB plugs in my computer and its not those plugs. Haven't tried eSata because it uses a weird cable to plug into. People told me that when it beeps everything is corrupted, but works fine on xp. I tried installing the drivers online from their website and when I try it asks me to put in a cd which makes no sense because they are online drivers. When I go into device manager nothing comes up, it just acts like the HD is invisible. The beeping will stop eventually as it is plugged in, but with no result.

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• How do I mount a HFS+ dd image in OSX?

  - by Paul McMillan

  I had an HFS+ formatted drive that was going bad and wouldn't mount at all on OSX. I created an image using ddrescue on linux, and was able to save most of it. I can mount the drive and see the data just fine in linux using this: mount -o loop -t hfsplus dd_image /Volumes/mountpoint This doesn't work on my OSX system since hfsplus isn't a valid filesystem type. If I try: mount -t hfs image mountpoint It complains that it needs a block device. What's the fix here?

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• How can I login to Ubuntu using a USB serial port?

  - by marc

  How can enable remote terminal login into Ubuntu 9.10 using a USB serial port? I created device /dev/ttyUSB0 and i want to allow logins using Hyper-Terminal. I found some resources but they are related to real hardware rs232 ports. I can't find any information about USB converter. So far I have established connection between that USB-serial port and my laptop. I can send text to the port (cp sometext.txt /dev/ttyUSB0) and read it using hyperterminal. What do I need to do to enable logins on this port?

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• Ubuntu 9.0.4 Presario S4000NX Fan Speed

  - by Chris C

  I recently install Ubuntu 9.0.4 on a Presario S4000NX and the CPU fan speed is kept at max. With Windows XP installed the fan speed would increase/decrease as required. I've tried to install lm-sensors and run the sensors-detect. It recommended that I load the modules which I did: smsc47m192 i2c-i801 When running sensor-detect it gave me this strange message: Trying family SMSC Found SMSC LPC47M15x/192/997 Super IO Fan Sensors (but not activated) Running the sensors command gives me a list of voltages and CPU and temperature but doesn't list any fans. After doing some Internet research I then tried to load the smsc47m1 module but I get the following error: FATAL: Error inserting smsc47m1 (/lib/modules/2.6.28-15-generic/kernel/drivers/hwmon/smsc47m1.ko): no such device The file smsc47m1.ko does exist in the listed folder. Any suggestions for getting the fan speed (and the noise) down in Ubuntu? Thanx. - Chris P.S. - I would have put better tags but Server Fault wouldn't let me.

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• Diagnosing high CPU waiting

  - by Will

  I have a monitoring server that is running icinga/collectd/graphite with about 50 hosts. I have noticed high load/slugging performance on the box. If you take a look at top, you'll see: Cpu(s): 0.6%us, 0.2%sy, 0.0%ni, 7.6%id, 23.4%wa, 0.0%hi, 0.2%si, 0.0%st Notice the HUGE %wa value, which as far as I know means a network or disk bottleneck. ifconfig shows no dropping packets and there's not a ton of bandwidth going on, so that leaves disk issues, right? There's not a lot of disk writing going on either...iotop is reporting we're only writing a little over 1 MB per second and the RAID tool reports everything is A-OK and write caching is enabled. How do I go about trying to figure out how to fix this? UPDATE: iostat -x output is: avg-cpu: %user %nice %system %iowait %steal %idle 0.62 0.10 0.31 9.65 0.00 89.31 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.21 33.34 83.55 16.54 1599.94 399.07 19.97 43.21 416.98 3.71 37.13

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• SATA Backward compatibility? [closed]

  - by Fladur

  Possible Duplicate: Can I connect a SATA-II hard drive to a SATA-I connection? Hello everyone One of my system is really old, but I still use it, right now, the HDD is and old IDE drive that is starting to fail (I got to many damaged sectors) and I'm planing to replace it. The motherboard supports Serial ATA 1 and I have a real nice offer on a SATA 2 drive, can I use that drive on a SATA 1 interface (obviously with reduced speed) just like a USB 2.0 device on a 1.0 port? Thanks in advance.

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• 2 routers, both DHCP, no IP assigned

  - by piobyz

  I can't get DHCP to assign IP to my wireless devices. My network config is as follows: Nanostation5 Linksys WRT350N, which is connected with Nanostation via its INTERNET port. Nanostation: LAN IP Address: 192.168.1.20 WLAN IP Address: 192.168.0.79 Network Mode: Router and is getting its IP via DHCP from my ISP Netmask: 255.255.255.0 Gateway IP: 192.168.1.1 LAN Network settings: IP Address: 192.168.1.20 Netmask: 255.255.255.0 Enable NAT: YES ENABLE DHCP Server: YES Range 192.168.1.100 ~ 250 Netmask: 255.255.255.0 Enable DNS Proxy: YES Linksys: Internet Connection Type: DHCP Router IP: 192.168.2.1 Subnet Mask: 255.255.255.0 DHCP: Enabled Start IP: 192.168.2.100 ~ 120 Advanced Routing: NAT: Enabled What I can do is connecting manually with this config: IP: 192.168.2.101 Subnet Mask: 255.255.255.0 Router: 192.168.2.1 DNS: 192.168.1.20 Search domains: WRT350N I want to be able to connect to both routers independently(now its 192.168.1.20 for Nanostation, and 192.168.2.1 for Linksys) and connect any wireless device using DHCP. What should be IP ranges, masks, etc. on both devices?

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• NTFS-3G is only mounting external drives as read-only

  - by Phanto

  I'm currently running RHEL 5.5, and I installed the ntfs-3g utility from here: http://www.tuxera.com/community/ntfs-3g-download/. I have also followed their instructions for auto-mounting NTFS USB drives here: http://www.tuxera.com/community/ntfs-3g-faq/#plugandplay. The problem I'm experiencing is that ntfs-3g is automatically mounting as root. In order for me to obtain write support, I need to navigate to the mounted device as root, and perform write actions with elevated privileges. Is there a way to mount USB NTFS volumes automatically without needing to sudo every write command? Thanks!

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• CentOS disable filesystem check: superblock last mount time is in the future

  - by Zac B

  I'm persistently getting the "Superblock last mount time is in the future" error when booting CentOS 6. I've seen other questions which ask how to resolve this error, but I know exactly why it's occurring: our development/testing VMs regularly have their date set to times far from the present, and have all of their filesystems remounted. What I want to know is: how do I disable all consistency checking for superblock mount time in centOS? I've tried tune2fs -i 0 <device> and setting buggy_init_scripts=1 in /etc/e2fsck.conf and neither has worked; the problem persists.

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• Windows shuts down unexpectedly when waking up from sleep

  - by Kush

  I've been facing this issue since yesterday, whenever I put the computer into sleep mode and when I wake up, it takes me to boot menu with choices; start Windows normally, safe mode, etc. in short, it shuts down unexpectedly while waking up. I have my laptop dual booted with up-to-date Windows 7 SP1 (32-bit) and Ubuntu 10.10. This problem is not happening with Ubuntu. I googled the issue and went through this, this and this page. But, none of the threads were helpful to solve it. I've found that there's something to do with device drivers. What can be done to resolve the issue? Can SFC utility solve it if it is due to corrupt system files?

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