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• Compatibility of Fedora install on a Hybrid drive

  - by kjh

  I recently bought un ultrabook with a 500gb/32gb sdd hdd hybrid drive, and I'm having trouble replacing windows on it with fedora seventeen. it errors out saying there was an unhandled exception. Is linux compatible with hybrid drives? or can the operating system on a hybrid drive not be replaced? Edit: here are the steps I select special storage devices because it ignores my hard drives otherwise at this point i get the message: "Disk contains bios raid meta data, disk sda will be ignored" I can pick a hostname, select my timezone and set a password at the install type screen, no matter what I select (use all free space, replace linux systems, create custom partition etc..) once I click next, it says "an unhandled exception" has occured. and I can no longer proceed with installation. Here is the error message: anaconda 17.29 exception report Traceback (most recent call first); File "/usr/lib64/python2.7/size-packages/pyanaconda/bootloader.py"; line 183 self.stage1_drive=self_drives[0] File "/usr/lib64/python2.7/site-packages/pyanaconda/rw/cleardisks_gui.ph"; line... and tons of more lines like that

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• which virtualization technology is right for me?

  - by Chris

  I need a little help with this getting this sorted out. I want to setup a linux virtual server that I can use to run both sever and desktop systems. I want a linux system that is minimalist in nature as all the main os will be doing is acting as a hypervisor. The system I'm trying to setup will be running a file server, windows 7, ubuntu 10.04, windows xp and a firewall/gateway security system. All the client OS'es accessing and storing files on the file server. Also all network traffic will be routed through the gateway guest os. The file sever will need direct disk access while the other guests can run one disk images. All of this will be running on the same computer so I wont be romoting in to access the guests OS'es. Also if possible I would like to be able to use my triple head setup in the guest OS'es. I've looked at Xen, kvm and virtualbox but I don't know which is the best for me. I'm really debating between kvm and virtual box as kvm seem to support direct hardware access.

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• Western Digital My Book not recognized by WD software

  - by Kari

  A few years ago I bought a WD My Book Pro 2. It worked fine for a while, then one of the drives failed and I sent it back to be replaced under warranty. I never got around to setting up the new one when I got it back. I finally ran out of room on my internal drive, so I tried to use the external - no go. Both drives spin up, but aren't recognized by either Disk Utility (Mac) or the WD Drive Manager. I tried on a PC as well with fresh software. Then I pulled the drives out of the enclosure (warranty is already expired) and plugged them straight into the PC. Both recognized and working 100% in RAID0. BIOS recognizes either disk as functional; Windows only sees them when both are connected due to the RAID which I can't change without the WD software. The drives that were returned to me are the "Green" drives which I've read are NOT recommended for RAID. Is it possible that this is interfering with them reading externally? Any other ideas? My main computer is a laptop so using them internally isn't an option :(

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• What hardware would I need (approx) to run ESXi server?

  - by mr.b

  Hi, I am considering to purchase off-the-shelf commodity hardware in order to build server that will host virtual machines using ESXi server. Intended purpose for this server is NOT mission critical tasks. It will have to run perhaps 20-50 Windows XP/Vista/7 virtual machines (in total, but closer to 20 figure). Each guest would have to have 1-2 GB of ram, and probably two-three times more disk space than guest OS needs with clean install and all updates applied (that would be around 6-8 GB for XP, and i believe closer to 10-15 for win7). Those guests will act as a test ground for a new product that is network management software, thus guests will idle most of their time once initially loaded, but if I give them some task to complete, they should be able to perform reasonably well. Now, from what I have learned... CPU is usually not much of an issue (6 cores would do it), memory should not be lacking, but doesn't have to be sum of all guests, because of overcommitment... That leads me to IO, which is, as it seems, the bottleneck. Since I have very little experience with ESXi (and ESX, too) server, I'd like to ask: How much memory could I save by overcommitment, and how does it affect performance? Is 6-core cpu enough to run above described system? Would it be possible to run entire server off two (or even one) SSD drives (to host system virtual disks, with few additional HDDs (2-3) in RAID 0 to be used as secondary storage? I read somewhere that ESXi allows having something like "master image", essentially virtual machine that is "deployed" many times, so that disk space can be saved by having only differences stored by specific guests, instead of copying around whole virtual disks. Is this true, and how can this help me? Are there any other things I need to take into consideration when building this off-the-shelf solution? I should probably mention here that I'm fully aware of issues like SPOF regarding power supply, raid 0, etc, but since it's only a testing ground and not a production system, it's not so important for me. Thanks, B.

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• How to (properly) back up a live QEMU/KVM VM?

  - by Roman

  I'm currently engineering a backup solution for KVM VM's as an additional measure to traditional backups. Unfortunately, all currently (August 2013) existing solutions I came across so far either: do not ensure a consistent backup of the VM (losing RAM state, creating a dirty image, or other things), or require lengthy downtime (complete VM shutdown while backing up). I'm aware of QEMU/libvirt's functionality of taking snapshots, however, it's not yet usable since: image-internal snapshots present you with an ever-changing image file, resulting in a likely dirty backup (assuming one uses qcow2 images at all). one cannot yet merge a currently active external snapshot into the original backing image ("blockcommit"). Out of the above reasons, I'm now implementing a script that: Saves the VM's state and halts it Sets up a devicemapper snapshot(s) where the VM's disk images and state reside Resumes the VM Mount the snapshot(s) of step 2. Backs up the VM's disk and state (configuration for convenience) Merges back the snapshot(s). If I got everything right, this will take consistent backups of VM's with only seconds (if at all, since 1-3 is fast, possibly sub-second) of downtime. Of course, when restoring, the VM will be way in the past, but at least giving me the option of an orderly shutdown/reboot. Am I missing something with this solution? Or has someone indeed already implemented this?

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• No partition on USB Flash Drive?

  - by Skytunnel

  A friend gave me a corrupted USB memory stick to try recovery data from. But I've had some unusual results, so thought I'd share to see if anyone is familiar with this problem... First off I just tried opening from my own PC. Windows prompted to Format the drive, which I of course declined Downloaded TestDisk to anaylsis the drive. And right away I noticed something strange, on the listed drives it comes up as Disk /dev/sdc - 6144 B - USB Flash Drive That's right, the first USB flash drive smaller than a floppy disk!? Moving on anyway... first anaylsis comes up with: Partition sector doesn't have the endmark 0xAA55 TestDisk's Quick Search gave no results, moved on to Deeper Search: No partition found or selected for recovery This left me stumped. I tired a couple of other programs with no success I did manage to get a backup image, but it was just as small as TestDisk indicated, so nothing of use on it After a few hours trying various suggestions from other sources, I gave in and just tried formatting the drive. But returned the message: Windows was unable to complete the format. From googling that, the suggestion was to delete the partition. But there is no partition to delete in this case. most recently I've tried formatting from cmd, and got this result: Format D: /FS:FAT32 The type of the file system is RAW The new file system is FAT32 Verifying 0M 11 bad sectors were encountered during the format. These sectors cannot be guaranteed to have been cleaned The volume is too small for FAT32 Anyone got any suggestions? UPDATE: As per suggestion from @Karen, I tried running a CLEAN from DISKPART, results as follows DiskPart has encountered an error: The request could not be preformed because of an I/O device error.

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• Hard drive causing BSOD

  - by JoshIrving

  I've come across a problem after building my new PC and installing a clean Windows 7. I originally planed on a RAID 1 or 0 but after further research I decided against it. So I was left with two 1TB Western Digital Black SATA 6Gb/s hard drives. My plan now was to use my second hard drive as a backup (using Windows Backup or 3rd party software). I set both hard drives to AHCI in the BIOS and installed Windows 7. I went through the lengthy process of downloading and installing each driver manually (latest versions), using the motherboard disk for a list of what I need. After a few restarts and before installing any software, I took an image backup onto DVD and the second hard drive. First witnessed the problem during the first scheduled Windows backup. The progress bar froze at about 70% (doc backup done, image backup in progress). It stayed still for 2 hours until it blue screened. Next time the backup froze, I tried shutting down. It logged me out and got stuck at the last step ("Shutting down" and blue spinner) for an hour, until I hard shutdown. I later realised this hasn't got anything to do with the backup. I ended up blue screening on almost every shut down (same place). Turns out, it's because of the second hard drive spinning down or turning off. The computer will now shutdown properly, as long as I remember to read or write to the second drive before executing shutdown. I've now set "Turn off hard disk after: Never" - No problems, so far. Do I have dodgy hard drive(s) or should I investigate the POWER_STATE_DRIVER_FAILURE BSOD - can it be a driver issue? AHCI?

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• Blue screen of Death on Install

  - by Toby Allen

  I have a machine with Windows Vista Installed. It has an Intel X25 SSD as the System Drive I want to reinstall (I plan to format and overwrite Vista) with XP. When I boot up using the Dell XP CD it loads the initial drivers then i get a Blue Screen. This is quite concerning. The installed OS works ok, but its giving problems so I want to remove it. Should I just format the SSD and try again? Will this make any difference? Can I do something to avoid hitting the Blue Screen? Its possible I had corrupt sectors on one of the other disks, will a new XP install use the System drive or drive 0? Can I force the install to use a specific drive when installing? Error: *** STOP: 0x0000007B (0xF78D2524,0x0000034,0x00000000,0x00000000) I never did find the answer, however I removed the SSD and tried to install on other disk - CRASH I disconnected the other disk and tried to install with only SSD plugged in - CRASH I removed 1 block of RAM - CRASH I used a windows 7 CD - NO CRASH

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• WIN7 constant BSOD 0x7B on boot, not producing any dump files where to go from here?

  - by prayingpantis

  So my one win 7 pc has been getting a BSOD on boot (roughly a sec after load screen starts) after a power failure. The complete stop code is 0x0000007B (0x80786B58, 0xC0000034,0x00000000,0x00000000) I've searched for quite a while now on the net and it seems like most people gave up after gettting 0x7B and no dump files. What I've tried so far: startup repair - reports it cannot repair computer automatically. BadPatch is reported somewhere in a problem signature contained in the problem details. startup repair with a WIN 7 CD - also fails, I can't recall what the error was, but it was not the same as the error produced with the start up tool shipped with the version of WIN 7 installed on my machine (I think the text had something ACL-ish contained in it) used a boot disk (Hiren's boot iso) - I used it to enable the CrashDump registry key and then after BSOD, read the HDD's dump locations but it was empty. Note, I'm quite sure the registry keys I edited are the correct ones, since the reboot on BSOD option was enabled by default and after I changed the regkey controlling this functionalitty to 0 the BSOD stayed after I booted again. check disk - works and returns no problems, also it seems I'm able to access all my files on the HDD. mem test - works and returns no errors So I'm not sure what else I can do to figure out what is the problem here. I read somewhere that you can use WINDBG to remote debug another PC, but I'm not sure if this is possible since the OS isn't even loaded yet? Also the last driver change I made on the system was installing a video driver, but I had no problems with it and were able to reboot several times until the power outage happened and the BSOD appeared. Any help or guidance for a way to DEBUG this problem would really be appreciated (I'm not really that keen to try a whole bunch of random fixes, I'd rather try and narrow down the problem first).

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• What are the typical methods used to scale up/out email storage servers?

  - by nareshov

  Hi, What I've tried: I have two email storage architectures. Old and new. Old: courier-imapds on several (18+) 1TB-storage servers. If one of them show signs of running out of disk space, we migrate a few email accounts to another server. the servers don't have replicas. no backups either. New: dovecot2 on a single huge server with 16TB (SATA) storage and a few SSDs we store fresh mails on the SSDs and run a doveadm purge to move mails older than a day to the SATA disks there is an identical server which has a max-15min-old rsync backup from the primary server higher-ups/management wanted to pack in as much storage as possible per server in order to minimise the cost of SSDs per server the rsync'ing is done because GlusterFS wasn't replicating well under that high small/random-IO. scaling out was expected to be done with provisioning another pair of such huge servers on facing disk-crunch issues like in the old architecture, manual moving of email accounts would be done. Concerns/doubts: I'm not convinced with the synchronously-replicated filesystem idea works well for heavy random/small-IO. GlusterFS isn't working for us yet, I'm not sure if there's another filesystem out there for this use case. The idea was to keep identical pairs and use DNS round-robin for email delivery and IMAP/POP3 access. And if one the servers went down for whatever reasons (planned/unplanned), we'd move the IP to the other server in the pair. In filesystems like Lustre, I get the advantage of a single namespace whereby I do not have to worry about manually migrating accounts around and updating MAILHOME paths and other metadata/data. Questions: What are the typical methods used to scale up/out with the traditional software (courier-imapd / dovecot)? Do traditional software that store on a locally mounted filesystem pose a roadblock to scale out with minimal "problems"? Does one have to re-write (parts of) these to work with an object-storage of some sort - such as OpenStack object storage?

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• Is there a way to use VirtualBox without using it's resource registry?

  - by Catskul

  Summary VirtualBox seems to want everything to be "registered" which makes it much more annoying to work with on the command line. I'm attempting to create an automated script which will create, move, start, stop, and destroy virtual machines and virtual disks. Requiring registration will complicate the task for the following reasons. leaves state information around that can cause unpredicted edgecases causing scripts to fail. creates potential name space collisions for multiple process creating VMs with the same name moving/copying resources on the same machine is more complicated because references in the registry need to be updated copying resources (disk + vm combination) to another machine require reconfiguration once they reach their target machine, and require the transfer of extra meta data to do the reconfiguration. If something unexpectedly fails, and an unregister thus fails to happen, left over configuration information can cause problems in subsequent runs. Use Case My specific use case is for a continuous integration server which creates and destroys VMs and Disk images potentially with the same name, and would require more logic to deal with the registry's statefulness. Imaginary Example It seems that I should just be able to for example (using some imaginary and/or incorrect commands): mkdir foobar customdiskimg_script ./foo/foo.vdi vboxmanage createvm --name "foo" --ostype Linux --basefolder ./foo/foo.xml vboxmanage storagectl ./foo/foo.xml --name foo --add ide vboxmanage storageattach --storagectl foo --medium ./foo/foo.vdi ./foo/foo.xml vboxmanage startvm ./foo/foo.xml TLDR Is there a way to use virtualbox without "registering" harddisks and VMs?

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• file read performance degrades as number of files increases

  - by bfallik-bamboom

  We're observing poor file read IO results that we'd like to better understand. We can use fio to write 100 files with a sustained aggregate throughput of ~700MB/s. When we switch the test to read instead of write, the aggregate throughput is only ~55MB/s. The drop seems related to the number of files since the throughput for read and write are comparable for a single file then diverge proportionally as we increase the number of files. The test server has 24 CPU cores, 48GB of memory, and is running CentOS 6.0. The disk hardware is a RAID 6 array with 12 disks and a Dell H800 controller. This device is partitioned with ext4 using the default settings. Increasing the readahead (using blockdev) improves the read throughput significantly but it still doesn't match write speed. For instance, increasing the readahead from 128KB to 1M improved the read throughput to ~145MB/s. Is this a known performance issue in our OS/disk/filesystem configuration? If so, how can we tell? If not, what tools or tests can we use to further isolate the issue? Thanks.

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• What Logs / Process Stats to monitor on a Ubuntu FTP server?

  - by Adam Salkin

  I am administering a server with Ubuntu Server which is running pureFTP. So far all is well, but I would like to know what I should be monitoring so that I can spot any potential stability and security issues. I'm not looking for sophisticated software, more an idea of what logs and process statistics are most useful for checking on the health of the system. I'm thinking that I can look at various parameters output from the "ps" command and compare to see if I have things like memory leaks. But I would like to know what experienced admins do. Also, how do I do a disk check so that when I reboot, I don't get a message saying something like "disk not checked for x days, forcing check" which delays the reboot? I assume there is command that I can run as a cron job late at night. How often should it be run? What things should I be looking at to spot intrusion attempts? The only shell access is SSH on a non-standard port through UFW firewall, and I regularly do a grep on auth.log for "Fail" or "Invalid". Is there anything else I should look at? I was logging the firewall (UFW) but I have very few open ports (FTP and SSH on a non standard port) so looking at lists of IP's that have been blocked did not seem useful. Many thanks

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• Boot stuck at blinking cursor before GRUB - only works via BIOS boot menu

  - by delta1

  I have a new box running Debian Squeeze. Grub is installed on /dev/sda, but when booting up I just get a blinking cursor, before the Grub menu. I can only boot to grub successfully when I choose boot options (during post) and select that specific drive! I have made sure the correct drive is set to boot first in the BIOS. So Grub works, but the system won't boot to that drive automatically? Any ideas on what could cause this? Drives sda/b/c are all 2TB (sda runs the system with b/c as raid device md0) with the following partitions: $ cat /proc/partitions major minor #blocks name 8 0 1953514584 sda 8 1 977 sda1 8 2 9765625 sda2 8 3 6445313 sda3 8 4 1937302627 sda4 8 32 1953514584 sdc 8 16 1953514584 sdb 9 0 1953513424 md0 but # fdisk -l /dev/sda gives WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sda: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sda1 1 243202 1953514583+ ee GPT Any insight into this strange behaviour would be greatly appreciated.

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• Windows 7 boot manager not localized on UEFI systems

  - by Massimo

  I originally posted this on SuperUser because I discovered this behaviour on my home computer, but this seems to be a general issue on UEFI systems, thus I'm posting here too; I also hope someone here can shed some light on what's going on. Italian version of Windows 7 x64 SP1, same installation media used for both situations. When running on BIOS systems, the boot manager is fully localized, both for the loading screen and for the F8 boot menu. When running on UEFI systems, the boot manager always runs in English, even if it's correctly configured to use the it-IT locale, as BCDEDIT clearly shows: Windows Boot Manager -------------------- identificatore {bootmgr} device partition=\Device\HarddiskVolume1 path \EFI\Microsoft\Boot\bootmgfw.efi description Windows Boot Manager locale it-IT inherit {globalsettings} default {current} resumeobject {9ef36aa6-4188-11e3-909d-d32f0c3871c8} displayorder {current} toolsdisplayorder {memdiag} timeout 30 Caricatore di avvio di Windows ------------------- identificatore {current} device partition=C: path \Windows\system32\winload.efi description Windows 7 locale it-IT inherit {bootloadersettings} recoverysequence {9ef36aa8-4188-11e3-909d-d32f0c3871c8} recoveryenabled Yes osdevice partition=C: systemroot \Windows resumeobject {9ef36aa6-4188-11e3-909d-d32f0c3871c8} nx OptIn I also noticed something strange here; the motherboard setup shows "Windows Boot Manager" as the main boot option, while the actual boot disk is listed as the second one. Looks like the Windows Boot Manager is actually being loaded from somewhere else than the first partition of the first disk... what's going on here? Update I've also checked the EFI boot manager using bcdedit /enum FIRMWARE. That one looks correctly localized, too: Boot Manager per firmware --------------------- identificatore {fwbootmgr} displayorder {bootmgr} {9ef36aa4-4188-11e3-909d-d32f0c3871c8} {a30e8550-47e4-11e3-9ad1-806e6f6e6963} timeout 1 Windows Boot Manager -------------------- identificatore {bootmgr} device partition=\Device\HarddiskVolume1 path \EFI\Microsoft\Boot\bootmgfw.efi description Windows Boot Manager locale it-IT inherit {globalsettings} default {current} resumeobject {9ef36aa6-4188-11e3-909d-d32f0c3871c8} displayorder {current} toolsdisplayorder {memdiag} timeout 30 Applicazione firmware (101fffff) ------------------------------- identificatore {9ef36aa4-4188-11e3-909d-d32f0c3871c8} description CD/DVD Drive Applicazione firmware (101fffff) ------------------------------- identificatore {a30e8550-47e4-11e3-9ad1-806e6f6e6963} description Hard Drive

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• Almost All Logical Volumes Disappeared - Recovery?

  - by Alex

  We had a hard disc crash of one of two hard discs in a software raid with a LVM on top. The server is running Citrix xenserver. On the hard disk which is still intact, the volume group gets detected well, but only one LV is left. (some hashes replaced by "x") # lvdisplay --- Logical volume --- LV Name /dev/VG_XenStorage-x-x-x-x-408b91acdcae/MGT VG Name VG_XenStorage-x-x-x-x-408b91acdcae LV UUID x-x-x-x-x-x-vQmZ6C LV Write Access read/write LV Status available # open 0 LV Size 4.00 MiB Current LE 1 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 root@rescue ~ # vgdisplay --- Volume group --- VG Name VG_XenStorage-x-x-x-x-408b91acdcae System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 698.62 GiB PE Size 4.00 MiB Total PE 178848 Alloc PE / Size 1 / 4.00 MiB Free PE / Size 178847 / 698.62 GiB VG UUID x-x-x-x-x-x-53w0kL I could understand if a full physical volume is lost - but why only the logical volumes? Is there any explanation for this? Is there any way to recover the logical volumes? EDIT We are here in a rescue system. The problem is that the whole server does not boot (GRUB error 22) What we are trying to do is to access the root filesystem. But everything was in the LVM. We have only this: (parted) print Model: ATA SAMSUNG HD753LJ (scsi) Disk /dev/sdb: 750GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 750GB 750GB primary boot, lvm And this 750GB LVM volume is exactly what we see on top.

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• Unnamed, hidden partitions on my 500 GB HD, HP Pavilion dm4 Laptop

  - by emotionull

  I have multiple doubts here. Its a Seagate 500GB 7200RPM HD. I had installed it few months back after my original Laptop HD stopped working. The current drives on my latop, as shown by the Windows Disk Management are: After installing the new HD, I had done a complete clean install of Windows 7 and I didn't create any parition myself, manually. So there are 4 drives. Even previously, before I installed this new HD, my laptop had 4 Partitions. But the there were no un-named partitions like the two in this case. The other two were HP tools and Recovery or something. It was pre-configured, Factory installed Windows. Also, now when I right cick on the unnamed Drives from Disk Management, all the options are greyed out (see image) except the delete partition image. So how do I know what's inside those partitions? Will it be ok if I delete them? I want install Ubuntu and dual boot it with my current windows installation. I cannot do it in current setup as there are already 4 partitions of my HD and if I will try to make a new partition, it will be a logical one (correct me if I am wrong here). So can I delete the un-named, hidden partitions and use them for Ubuntu? A bit unrelated question. As a backup option, can I use the Windows 7's Backup and Restore facility to keep a complete backup of all the drivers and system softwares.

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• When using software RAID and LVM on Linux, which IO scheduler and readahead settings are honored?

  - by andrew311

  In the case of multiple layers (physical drives - md - dm - lvm), how do the schedulers, readahead settings, and other disk settings interact? Imagine you have several disks (/dev/sda - /dev/sdd) all part of a software RAID device (/dev/md0) created with mdadm. Each device (including physical disks and /dev/md0) has its own setting for IO scheduler (changed like so) and readahead (changed using blockdev). When you throw in things like dm (crypto) and LVM you add even more layers with their own settings. For example, if the physical device has a read ahead of 128 blocks and the RAID has a readahead of 64 blocks, which is honored when I do a read from /dev/md0? Does the md driver attempt a 64 block read which the physical device driver then translates to a read of 128 blocks? Or does the RAID readahead "pass-through" to the underlying device, resulting in a 64 block read? The same kind of question holds for schedulers? Do I have to worry about multiple layers of IO schedulers and how they interact, or does the /dev/md0 effectively override underlying schedulers? In my attempts to answer this question, I've dug up some interesting data on schedulers and tools which might help figure this out: Linux Disk Scheduler Benchmarking from Google blktrace - generate traces of the i/o traffic on block devices Relevant Linux kernel mailing list thread

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• How to fix Windows 7 device removal notification loop

  - by Barry Kelly

  Bit of an odd one this. One of our PCs is getting caught in a loop some time after being turned on, usually after a USB storage device has been attached - sometimes an iPod, sometimes a GPS. Specifically, Windows Explorer starts showing a drive icon and letter (E:, as of right now) for the System partition (the small hidden one at the start of the boot drive). Then, the icon disappears. Then it reappears again. And disappears. It does this very quickly, at what looks like maybe 50 times a second. CPU usage in this loop is also very high; averages about 66%. This machine has an i7 920 CPU, which is quad core with hyperthreading; so this usage rate works out to about 5 100% busy threads, along with whatever normal idle load is (particularly Task Manager itself). Inspecting with Process Explorer shows that the device removal notification infrastructure has gone berserk. The threads in system service processes (i.e. apart from Windows Explorer) which are using all the CPU power relate to device notification. The Disk Management MMC snap-in also fails to run when the loop starts. The only way to break the loop, it seems, is to reboot the machine. Anyone seen anything similar to this, and know of a way to fix it? Machine details: Windows 7 x64, fully patched i7 920, 12GB RAM Intel SSD 80GB (X25-M, I believe; not G2) 2TB 5.2K disk for bulk storage AMD HD 5870 Further hardware details await. I'm going to go through and update all drivers I can find.

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• Recovering a broken NTFS filesystem?

  - by OverTheRainbow

  A much-needed Windows Update broke a Vista laptop that was running fine until then: After booting up, Windows displays "Please wait..." but it never goes anywhere. I waited for a couple of hours, there is a bit of disk activity, but it didn't work out in the end. I booted with the Vista DVD, chose "Repair your computer" which said that there was nothing wrong :-/ Next, I booted it up with a Linux USB keydrive, and ran Gparted 0.8.1 (which includes ntfsresize v2011.4.12AR.4 libntfs-3g) which displays a bunch of warnings for the NTFS partition where the Vista system is located such as: ntfs_mst_post_read_fixup: magic: 0x00000000 size: 1024 usa_ofs: 0 usa_count: 65535: Invalid argument Record 16 has no FILE magic (0x0) Next, I ran ntfsfix /dev/sda2, which said: Mounting volume... OK Processing of $MFT and $MFTMirr completed successfully. NTFS volume version is 3.1. NTFS partition /dev/sda2 was processed successfully. Next, I rebooted Vista, which did a CHKDSK, before rebooting. But I'm still getting nowhere with "Please wait..." Before I copy the user's data to another host and reinstall Vista from a DVD, does someone know what I could try? Thank you. Edit: In case someone else has the same issue... After the BIOS, hit F8 and choose "Repair your computer", followed by "Toshiba HDD Recovery". In addition to a 1,5GB partition labelled "WinRE", the hard disk contains a second partition labeled "Data" from which the application will fetch a system image and reinstall it in the "Vista" partition. Make sure you copy your data out of the system partition before doing this.

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• Hard drive causing BSOD

  - by JoshIrving

  I've come across a problem after building my new PC and installing a clean Windows 7. I originally planed on a RAID 1 or 0 but after further research I decided against it. So I was left with two 1TB Western Digital Black SATA 6Gb/s hard drives. My plan now was to use my second hard drive as a backup (using Windows Backup or 3rd party software). I set both hard drives to AHCI in the BIOS and installed Windows 7. I went through the lengthy process of downloading and installing each driver manually (latest versions), using the motherboard disk for a list of what I need. After a few restarts and before installing any software, I took an image backup onto DVD and the second hard drive. First witnessed the problem during the first scheduled Windows backup. The progress bar froze at about 70% (doc backup done, image backup in progress). It stayed still for 2 hours until it blue screened. Next time the backup froze, I tried shutting down. It logged me out and got stuck at the last step ("Shutting down" and blue spinner) for an hour, until I hard shutdown. I later realised this hasn't got anything to do with the backup. I ended up blue screening on almost every shut down (same place). Turns out, it's because of the second hard drive spinning down or turning off. The computer will now shutdown properly, as long as I remember to read or write to the second drive before executing shutdown. I've now set "Turn off hard disk after: Never" - No problems, so far. Do I have dodgy hard drive(s) or should I investigate the POWER_STATE_DRIVER_FAILURE BSOD - can it be a driver issue? AHCI?

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• Corsair SSD appears completely blank and does not retain written data

  - by ebanders

  I have a 180GB Corsair SSD (model# CSSD-F180GB2-BRKT) as the primary drive in a Windows laptop. Recently the machine became unbootable after installing Windows updates. Windows installed updates before the machine shut down and the next time the machine boot up it complained about not being able to find a bootable device. After finding fixmbr unsuccessful at making the machine unbootable, I investigated a little within knoppix. Fdisk revealed an empty partition table. A scan by Testdisk came up empty. And finally 'head -c 1024 | hd' reveals all zeros. Creating a primary partition spanning the whole disk completes successfully, but after a reboot the disk appears empty again. dmesg reveals no read or write errors. smartctl indicates that the drive is healthy- although the SMART attribute values do not appear to be read properly. "Data Page | WARNING: PREVIOUS ATTRIBUTE HAS TWO" and "Threshold Page | INCONSISTENT IDENTITIES IN THE DATA" messages appear within the table of values. I don't have much experience with SSDs. Is this drive dead or something? Can anyone recommend any diagnostic tools that may be suited for diagnosing SSDs?

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• Windows 7 Synchronize folders BUT while some files are open

  - by Nick

  I need some way to synchronize 2 drives I have. I want to do this ofter (once a day or so) There is the main drive that I want to clone/synchronize on a backup hard disk. The problem is in that there is an open TrueCrypt file mounted as a drive, and its live. If you don't know what true crypt is, basically you create a file on a hard disk and that file is encrypted. It's constantly open and modified live. Also Its pretty large. 100GB + I will use freefilesync . There are many tools that can do that. My question is, is it safe to copy the encrypted file while its open ? Does the software freeze the file in one state and copies it ? Or will I get a corrupted file on the other drive ? It was not clear to me how windows handles that. I read something about shadow copy, and the software says that it supports this. Does anyone know something on the matter that can help me ? or some software that will work ok in my scenario ? Thanks

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• Windows XP VM on VMWare ESXi 4.1 "pausing" / blocked occasionally

  - by FelixD

  We have an issue with Windows XP SP3 VMs on VMWare ESXi 4.1.0 (the free version): They sometimes seem to "pause" for several minutes. This happens rarely (maybe once a month per VM, at least noticed only that often), but still is an issue for us. It happens for three different but similar VMs on three pretty different hosts (different hardware). I have the feeling that the "pausing" is not actually the CPU blocking, but probably the harddisks, but not 100% sure. The servers have one IDE disk (C:) and one SCSI (D:) and it might be either of the two. I have seen scheduled tasks simply not starting for up to 9 minutes and then running normally again with normal speed. They were totally blocked. This is not a load issue, the VMWare hosts have average load and the VMs in question already have reserved CPU resources plus high priorities for CPU and disk. The Windows boxes run mainly MySQL, Tomcat, FileZilla server, Cygwin stuff, Java + R applications, VMWare client, Elusiva Terminal Server pro, Nagios client. Not sure if this might be related with any of that software (e.g. Elusiva). Trying to debug this, there was nothing visible in Windows Event log, other logs in C:\Windows, VMWare events etc. Unfortunately the vmware.log file ends with "Log throttled". We found that we ran into 2 VMWare bugs there: The VMWare client writes lots on bogus messages in the vmware.log, which we now disabled (log level error setting) plus the bug that VMWare does not unthrottle the log (at least so far despite VM reboots). I know there is not much guidance and that may also be the reason why I so far didn't find anything related on the web or on ServerFault, but maybe some of this rings a bell with someone? Or please direct me to what more info to post. I hope that the vmware.logs get unthrottled eventually (can't easily restart the hosts at the moment). Thanks for any input!

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• Windows Server 2008 R2 grinds to a screeching halt during file copy operations

  - by skolima

  When my Windows Server 2008 R2 machine is performing any large disk operations (copying 10GB files from one drive to another, copying similar file over network, merging HyperV snapshots, compressing large files), performance of the whole machine slows down terribly, everything becomes unresponsive. This is noticeable in any situation when the disk access is large enough not to fit in the cache. Are there any settings available for tuning this behaviour? I can accept slower file transfer if this would give me more responsiveness. System details: Dell Optiflex 960, Core 2 Quad Q9650, 8GB RAM, 2 SATA drives - 320GB (ST3320418AS) and 1TB (ST31000528AS), NCQ active on both, Intel 82564LM-3 Gigabit Ethernet, ATI HD 3450 graphics, Intel ICH10 bridge. We have multiple machines like this, every one is exhibiting the same behaviour. I though this was overkill for a workstation, apparently I was mistaken. Update: I guess I shouldn't have mentioned the HyperV at all. The above configuration is a standard workstation setup at the company I work for, this is not a server of any kind. I have at most 3 virtual machines working, and usually I'm the only person accessing them. Never the less, the slowdown occurs even when no VMs are running. On a Linux machine I'd simply ionice the copy process and I could forget about it, is there any way to manage IO priorities on Windows?

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