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• Creating RAID1 on Windows Server causes not enough disk space error

  - by northpole

  I have three disks. Disk0 (boot), Disk1 and Disk2. Disk 1 and 2 are both unformatted and unallocated drives. I am trying to mirror Disk0 to Disk1. They are both Dynamic and are both the same size (1TB). When I select Disk1 to be the mirror I get the error "There is not enough space available on the disk(s) to complete this operation". I have spent several hours searching for a solution but have not found one. Why do I get this error when they are both the same size? EDIT: Shrinking the volume size on the boot disk by 100MB allowed me to get past this error. From what I read the mirror drive needs to be the same size or larger than the boot drive. So I am confused why that change worked. However, I now get the error " all disks holding extents for a given volume must have the same sector size and the sector size must be valid". I believe this is because the drives are different and one has 512B and the other is the Advanced Drive that is 4KB. What the different sector sizes cause both problems? If I got the same disks would both issues go away?

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• Debian software raid 1: boot from both disk

  - by bsreekanth

  I newly installed debian squeeze with software raid.The way I did was, as also given in this thread. I have 2 HDD with 500 GB each. For each of them, I created 3 partitions (/boot, / and swap) I selected the hard drive and created a new partition table I created a new partition that was 1GB. I then specified to use the partition as a Physical Volume for RAID. and used for /boot and enabled bootable. Created another partition, which is of 480 GB, and then specified to use the partition as a Physical Volume for RAID. and used for /. Created another partion and used for swap Then RAID configuration: Through Configure RAID menu - create MD device - (2 for the number of drives, 0 for spare devices) Next select the partitions you want to be members of /dev/MD0. I selected /dev/sda1 and /dev/sdb1 (for /boot) Next select the partitions you want to be members of /dev/MD1. I selected /dev/sda6 and /dev/sdb6 (for /) And no RAID for swap partitions 'Finish Partitioning and write changes to disk' -- Finish the rest of the install like normal Everything is ok now, except I am not sure how to test my raid config. When I pull the power of the HDD, it only boots from one disk. I read in some forum that I may have to install GRUB manually on the other. In Debian Squeeze, there is no grub command. Not sure how to make my software raid bootable from both disk. Also, please comment on my steps above. Anything unusual. I configured /boot partitions of both disks to be boot=yes. Not sure whether that is ok. Thanks, Bsr

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• HP Pavillion DV6500 recovery disk failure

  - by Scott W

  I recently attempted to re-install Windows Vista on an HP Pavillion DV6500 using the factory recovery DVD's, but encountered a strange problem. When the recovery disk attempted to reformat the hard disk, it failed at 22%. The error message provided was not very informative, just the error code "0x400110020000 1005". A google search turned up some people with a similar problem who asserted that HP has been know to ship corrupted recovery DVDs. The recovery disk did manage to reformat the the recovery partition before failing though, so recovering from the partition is no longer an option. It would be possible to reinstall from an off-the-shelf retail copy of Vista and then pull the drivers from HP's website, but I don't have access to a copy of Vista, and it would really be outrageous to have to purchase a new OS when I have a perfectly valid license already. Thought about biting the bullet and upgrading to Windows 7, but my understanding is that without Vista installed I'd be unable to use the upgrade version, and be forced to purchase the more expensive non-upgrade retail copy (!). Can anyone suggest a possible solution to this Catch-22? I've run out of ideas.

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• High disk I/O - jbd2/sda2-8 process

  - by Evan Hamlet

  I have run a file server on a CentOS 5.8 final server. My only concern at the moment is what appears to be intermittent but continuous high disk I/O activity causing a general slowdown because of jbd2/sda2-8 process. jbd2/sda2-8 is making use of /dev/sda2, which is the 2nd partition of the first harddrive (IE: root partition). More info: using "iotop" the culprit appears to be "jbd2/sda1-8" making writes every second, which appears to be a kernel process associated with journaling on the ext4 filesystem, if my googling around is correct. I see "jbd2/sda2-8" appearing here every now and then, but certainly not every 3 seconds.. when idle, it appears about 1 or 2 times per minute. When I'm using the system, it appears more frequently. ATOP results: http://grabilla.com/02b14-8022db2e-4eb9-4f10-8e10-d65c49ad7530.png IOTOP results: http://grabilla.com/02b14-cf74b25d-4063-4447-9210-7d1b9b70e25b.png HTOP results: grabilla. com/02b14-ad8cad0e-89b0-46d3-849d-4fd515c1e690.png jbd2/sda2-8 is the processes I see with iotop making writes on disk even though it's not in use at all. Does someone has any idea how could I solve the high disk usage caused jbd2/sda2-8 process?

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• Windows XP Setup Fails to Recognize USB Floppy after formatting AHCI disk

  - by Strahn

  I am attempting to install Windows XP Professional x64 onto a HP EliteBook 8540w. I have downloaded both the latest Intel Rapid Storage Technology drivers and the Intel Storage Matrix drivers that are listed on HPs website and copied the drivers over to a floppy disk (two separate floppies, one for each version of the drivers.) Booting to my WinXP Pro x64 install CD, I go through the F6 process, load the driver and am able to see my HDD, delete, create and format partitions on it. When I go to continue the install, after checking the disk, the system asks me to enter the disk labeled "Intel Rapid Storage Technology" and press enter to continue. Nothing happens at this point when I press enter. This happens if I use the latest drivers or the older drivers. We have created a slipstreamed install CD using nLite that has the AHCI drivers integrated, which installs fine. However, we have identified a number of issues with the system that I believe are side-effects of using nLite for the slipstreaming and I am attempting to verify that. I have researched this issue and found a few examples of others having the same problem, but no solution. The USB floppy is a Lacie branded floppy, connecting it to a working XP workstation shows it to be the Y-E Data USB floppy drive that is supposedly 100% compatible with XP per MS KB 916196.

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• How to export SQL Server data from corrupted database (with disk write error)

  - by damitamit

  IT realised there was a disk write error on our production SQL Server 2005 and hence was causing the backups to fail. By the time they had realised this the nightly backup was old, so were not able to just restore the backup on another server. The database is still running and being used constantly. However DBCC CheckDB fails. Also the SQL Server backup task fails, Copy Database fails, Export Data Wizard fails. However it seems all the data can be read from the tables (i.e using bcp etc) Another observation I have made is that the Transaction Log is nearly double the size of the Database. (Does that mean all the changes arent being written to the MDF?) What would be the best plan of attack to get the database to a state where backups are working and the data is safe? Take the database offline and use the MDF/LDF to somehow create the database on another sql server? Export the data from the database using bcp. Create the database (use the Generate Scripts function on the corrupt db to create the schema on the new db) on another sql server and use bcp again to import the data. Some other option that is the right course of action in this situation? The IT manager says the data is safe as if the server fails, the data can be restored from the mdf/ldf. I'm not sure so insisted that we start exporting the data each night as a failsafe (using bcp for example). IT are also having issues on the hardware side of things as supposedly the disk error in on a virtualized disk and can't be rebuilt like a normal raid array (or something like that). Please excuse my use of incorrect terminology and incorrect assumptions on how Sql Server operates. I'm the application developer and have been called to help (as it seems IT know less about SQL Server than I do). Many Thanks, Amit

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• HP Pavillion DV6500 recovery disk failure

  - by Scott W

  I recently attempted to re-install Windows Vista on an HP Pavillion DV6500 using the factory recovery DVD's, but encountered a strange problem. When the recovery disk attempted to reformat the hard disk, it failed at 22%. The error message provided was not very informative, just the error code "0x400110020000 1005". A google search turned up some people with a similar problem who asserted that HP has been know to ship corrupted recovery DVDs. The recovery disk did manage to reformat the the recovery partition before failing though, so recovering from the partition is no longer an option. It would be possible to reinstall from an off-the-shelf retail copy of Vista and then pull the drivers from HP's website, but I don't have access to a copy of Vista, and it would really be outrageous to have to purchase a new OS when I have a perfectly valid license already. Thought about biting the bullet and upgrading to Windows 7, but my understanding is that without Vista installed I'd be unable to use the upgrade version, and be forced to purchase the more expensive non-upgrade retail copy (!). Can anyone suggest a possible solution to this Catch-22? I've run out of ideas.

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• Linux - preventing an application from failing due to lack of disk space [migrated]

  - by Jernej

  Due to an unpredicted scenario I am currently in need of finding a solution to the fact that an application (which I do not wish to kill) is slowly hogging the entire disk space. To give more context I have an application in Python that uses multiprocessing.Pool to start 5 threads. Each thread writes some data to its own file. The program is running on Linux and I do not have root access to the machine. The program is CPU intensive and has been running for months. It still has a few days to write all the data. 40% of the data in the files is redundant and can be removed after a quick test. The system on which the program is running only has 30GB of remaining disk space and at the current rate of work it will surely be hogged before the program finishes. Given the above points I see the following solutions with respective problems Given that the process number i is writing to file_i, is it safe to move file_i to an external location? Will the OS simply create a new instance of file_i and write to it? I assume moving the file would remove it and the process would end up writing to a "dead" file? Is there a "command line" way to stop 4 of the 5 spawned workers and wait until one of them finishes and then resume their work? (I am sure one single worker thread would avoid hogging the disk) Suppose I use CTRL+Z to freeze the main process. Will this stop all the other processes spawned by multiprocessing.Pool? If yes, can I then safely edit the files as to remove the redundant lines? Given the three options that I see, would any of them work in this context? If not, is there a better way to handle this problem? I would really like to avoid the scenario in which the program crashes just few days before its finish.

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• Zpool disk failure - Where am I at?

  - by JT.WK

  After checking the status of one of my zpools today, I was faced with the following: root@server: zpool status -v myPool pool: myPool state: ONLINE status: One or more devices has experienced an unrecoverable error. An attempt was made to correct the error. Applications are unaffected. action: Determine if the device needs to be replaced, and clear the errors using 'zpool clear' or replace the device with 'zpool replace'. see: http://www.sun.com/msg/ZFS-8000-9P scrub: resilver completed after 3h6m with 0 errors on Tue Sep 28 11:15:11 2010 config: NAME STATE READ WRITE CKSUM myPool ONLINE 0 0 0 raidz1 ONLINE 0 0 0 c6t7d0 ONLINE 0 0 0 c6t8d0 ONLINE 0 0 0 spare ONLINE 0 0 0 c6t9d0 ONLINE 54 0 0 c6t36d0 ONLINE 0 0 0 c6t10d0 ONLINE 0 0 0 c6t11d0 ONLINE 0 0 0 c6t12d0 ONLINE 0 0 0 spares c6t36d0 INUSE currently in use c6t37d0 AVAIL c6t38d0 AVAIL errors: No known data errors From what I can see, c6t9d0 has encountered 54 write errors. It seems as though it has automatically resilvered with the spare disk c6t36d0, which is now currently in use. My question is, where exactly am I at? Yes the 'action' tells me to determine whether or not the disk needs replacing, but is this disk currently still in use? Can I replace / remove it? Any explanation would be much appreciated as I'm quite new to this stuff :) update: After following the advice from C10k Consulting, ie detaching: zpool detach myPool c6t9d0 and adding as a spare: zpool add myPool spare c6t9d0 It appears as though all is well. The new status of my zpool is: root@server: zpool status -v myPool pool: myPool state: ONLINE scrub: resilver completed after 3h6m with 0 errors on Tue Sep 28 11:15:11 2010 config: NAME STATE READ WRITE CKSUM muPool ONLINE 0 0 0 raidz1 ONLINE 0 0 0 c6t7d0 ONLINE 0 0 0 c6t8d0 ONLINE 0 0 0 c6t36d0 ONLINE 0 0 0 c6t10d0 ONLINE 0 0 0 c6t11d0 ONLINE 0 0 0 c6t12d0 ONLINE 0 0 0 spares c6t37d0 AVAIL c6t38d0 AVAIL c6t9d0 AVAIL errors: No known data errors Thanks for your help c10k consulting :)

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• Hard Disk Not Counting Reallocated Sectors

  - by MetaNova

  I have a drive that is reporting that the current pending sectors is "45". I have used badblocks to identify the sectors and I have been trying to write zeros to them with dd. From what I understand, when I attempt writing data directly to the bad sectors, it should trigger a reallocation, reducing current pending sectors by one and increasing the reallocated sector count. However, on this disk both Reallocated_Sector_Ct and Reallocated_Event_Count raw values are 0, and dd fails with I/O errors when I attempt to write zeros to the bad sectors. dd works fine, however, when I write to a good sector. # dd if=/dev/zero of=/dev/sdb bs=512 count=1 seek=217152 dd: error writing ‘/dev/sdb’: Input/output error Does this mean that my drive, in some way, has no spare sectors to be used for reallocation? Is my drive just in general a terrible person? (The drive isn't actually mine, I'm helping a friend out. They might have just gotten a cheap drive or something.) In case it is relevant, here is the output of smartctl -i : Model Family: Western Digital Caviar Green (AF) Device Model: WDC WD15EARS-00Z5B1 Serial Number: WD-WMAVU3027748 LU WWN Device Id: 5 0014ee 25998d213 Firmware Version: 80.00A80 User Capacity: 1,500,301,910,016 bytes [1.50 TB] Sector Size: 512 bytes logical/physical Device is: In smartctl database [for details use: -P show] ATA Version is: ATA8-ACS (minor revision not indicated) SATA Version is: SATA 2.6, 3.0 Gb/s Local Time is: Fri Oct 18 17:47:29 2013 CDT SMART support is: Available - device has SMART capability. SMART support is: Enabled UPDATE: I have run shred on the disk, which has caused Current_Pending_Sector to go to zero. However, Reallocated_Sector_Ct and Reallocated_Event_Count are still zero, and dd is now able to write data to the sectors it was previously unable to. This leads me with several other questions: Why aren't the reallocations being recored by the disk? I'm assuming the reallocation took place as I can now write data directly to the sector and couldn't before. Why did shred cause reallocation and not dd? Does the fact that shred writes random data instead of just zeros make a difference?

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• Frequent freezes with constant disk activity on SSD netbook

  - by SamsLembas

  I am running Arch Linux on an HP Mini 1000 with a SSD. The machine is a little under a year old and fairly heavily used. About a month ago the machine started freezing up. During the freezes, the system is almost completely unresponsive, seemingly especially for disk-intensive tasks such as launching an application for the first time since reboot. The disk activity led is always constantly illuminated during the freezes. After somewhere between 30 sec and 3 minutes, the machine returns to normal operation. I am pretty sure that the SSD is the source or the problem. Iotop reports a disk transfer rate of 0 during the freezes, so I think it must be getting "stuck" and simply not performing any r/w during the time. I can't seem to find any information on these symptoms on the Internet, so any input on exactly what might be the cause of this would be greatly appreciated. The machine is under warranty, but I would rather not deal with HP until I actually know what is going on. Thanks.

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• VMWare Workstation 8 Disk I/O & Hard Faults

  - by Scott

  I have VMWare Workstation 8 installed on a host machine with the following specs: Intel i5 2500k CPU 16GB DDR3 1600 ram 1TB Western Digital Caviar Black HD I have two Windows 7 virtual machines configured (currently running one at a time but will be operating both at once when my 32GB RAM kit arrives in a couple days). Each one is configured with 8GB of RAM and no tweaks/performance customizations or anything done. All of the VMWare settings are the defaults. When I boot into these machines and run various programs (Visual Studio, Outlook, etc), I can hear the disk thrashing quite a bit and checking Resource Monitor, I can see that I'm getting anywhere between 300-800 hard faults per second. From the host machine, it shows they're coming from the VMWare image. If I go to the virtual machine, whatever app I'm currently loading is the image that's causing the hard faults. As I understand it, hard faults are (simply) when an address in memory has been swapped out to the page file and has to be read from the page file instead of from memory. I don't understand why this is happening though. With 8GB of ram on the guest machine and 6.5GB available, what could be causing this? I know Windows 7 supposedly improved on page file management over XP but it seems excessive for this kind of slowdown, disk thrashing and high hard fault count when I have that much free RAM. Is there anything I can to to improve the performance in my guest machines? On the host machine, I can open/run any applications at all and hard faults stays around 0 with low disk I/O.

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• dd on entire disk, but do not want empty portion

  - by Jonathan Henson

  I have a disk, say /dev/sda. Here is fdisk -l: Disk /dev/sda: 64.0 GB, 64023257088 bytes 255 heads, 63 sectors/track, 7783 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: 0x0000e4b5 Device Boot Start End Blocks Id System /dev/sda1 * 1 27 209920 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 27 525 4000768 5 Extended Partition 2 does not end on cylinder boundary. /dev/sda5 27 353 2621440 83 Linux /dev/sda6 353 405 416768 83 Linux /dev/sda7 405 490 675840 83 Linux /dev/sda8 490 525 282624 83 Linux I need to make an image to store on our file server for use in flashing other devices we are manufacturing so I only want the used space (only about 4gb). I want to keep the mbr etc... as this device should be boot ready as soon as the copy is finished. Any ideas? I previously had been using dd if=/dev/sda of=[//fileserver/file], but at that time, my master copy was on a 4gb flash ide.

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• Can not mount my USB disk-- Ubuntu nor windows[dmesg including]

  - by EthanZ6174

  first, here is my dmesn|tail result right after i plugged the disk: $ dmesg | tail [ 2578.697224] scsi 6:0:0:0: Direct-Access HP v100w PMAP PQ: 0 ANSI: 0 CCS [ 2578.698322] sd 6:0:0:0: Attached scsi generic sg2 type 0 [ 2578.916464] sd 6:0:0:0: [sdb] 3921920 512-byte logical blocks: (2.00 GB/1.87 GiB) [ 2578.916950] sd 6:0:0:0: [sdb] Write Protect is off [ 2578.916956] sd 6:0:0:0: [sdb] Mode Sense: 23 00 00 00 [ 2578.916961] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 2578.922460] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 2578.922470] sdb: [ 2578.969570] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 2578.969578] sd 6:0:0:0: [sdb] Attached SCSI removable disk there is nothing after 'sdb:' ... at the meantime, the lsusb shows: $ lsusb Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 004: ID 03f0:3207 Hewlett-Packard Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 006 Device 002: ID 045e:0737 Microsoft Corp. Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub so... can anyone help me? what's wrong with my USB disk? THX

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• Ubuntu+Win7--disk error press any key to restart

  - by Siddharth

  Apparently,none of the solutions in any other posts and forums worked for me For some reasons I decided to remove ubuntu from my hard disk drive. My partition table(presently): (/dev/sda1) (fat32) 900 MiB ---(MBR,I suppose) (/dev/sda2) (ntfs) 70 GiB -----(Windows 7) (/dev/sda3) (ntfs) 314.88 GiB --(Personal File storage) (/dev/sda4) (ext4) 80 GiB -----(Ubuntu 13.04) (unallocated) -----1.31 MiB So,after moving(cut-paste) everything(for backup) from the fat32 partition using win7..I booted into Ubuntu and copied the remaining 3 files(hidden in Win7 file explorer) --bootmgr,bootsect.bak,and one more which I do not remember.TERRIBLE MISTAKE After this I again booted into Windows and deleted ext4 partition..formatted it to ntfs..and shut down the pc.Then,I put in a Win7 bootable USB..using command prompt I entered bootrec /fixmbr,and bootrec /fixboot.. Restarting showed me the GRUB..choosing windows 7 showed me "Disk Error. Press any key to restart." I also installed a fresh Win7 installation on the 80 GiB partition expecting a Windows Legacy Bootloader with two win7 options..but did not work. Then..I used a Ubuntu LiveUSB to put it back to the present configuration(above) since all methods to restore the MBR failed.. I copied back the fat32 partitions backup files but couldn't copy those 3 files.Somehow ,they had been recreated and were non-replaceable. I do not want to format the win7 partition for a fresh one. I have used boot-repair..Restore MBR option brings back to "Disk error...." without even going through grub..so I reinstalled grub and I'm able to boot into Ubuntu. grub menu shows the win7 option as "Windows 7 (loader) (on /dev/sda1)". paste.ubuntu.com/5753710 paste.ubuntu.com/5775999

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• Windows disk change monitoring for malware analysis

  - by SuperDuck

  Not sure if this question belongs to here, because it has some relations with 'serverfault' (system backups) and 'stackoverflow' (software analysis). I'm looking for a solution to monitor disk changes on a Windows system and selectively revert them. It should be able to handle live files like registry parts, so may need to be an offline backup software. It shouldn't silently pass over files which the current admin user doesn't have permissions on (files with no permission entries or owned by the 'system' user) Registry change tracking would be a bonus but is not a requirement I use virtual machines for malware analysis, there is even no solution to list file changes in disk snapshot files (delta VMDK). I currently use Ashampoo for monitoring changes. Though it's the best one between similars, it's not a good software and hasn't really evolved in many 'platinum', 'deluxe' versions released in the last 10 years (it even used non-resizable windows until the latest version). The real problem is it misses some disk / registry changes. Perhaps it only compares modification dates and doesn't catch a change if the dates are preserved. So, I think the solution should compare files using hashes, or file sizes at least. There are numerous backup software out there and I'm sure one can handle this, offline or online.

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• Windows 7 PC freezes frequently with hard disk light constantly on

  - by Senthil

  I recently replaced a defective hard disk with a new one - Windows 7 - "A disk read error occured. Press Ctrl + Alt + Del to restart" I have been using the new hard disk with a Windows 7 installation for about 4 days. Now it has started freezing frequently. Sometimes every 2 minutes and sometimes every 10 seconds. There is lots of software installed - I am a developer and my PC is full of IDEs, database servers, web servers, developer tools, testing tools, all browsers etc.. My windows is up to date as of now. I have installed ALL updates including optional drivers etc. All my installed software is up to date. I scanned my computer using Microsoft Security Essentials and found nothing malicious. I did a chkdsk /r and found no problems. I did a memory diagnostic and found no problems. When I go into safe mode, it doesn't freeze and I am able to use it normally for longer periods of time. What other steps can I take to locate the problem?

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• Computer will not boot - disk read error - cannot boot from HD or DVD

  - by Grant Palin

  This is a 3 year-old system: HP a1640n. There have been no issues with it in the past. I added a video card 2 years ago, and more memory 1 year ago, both without issues. There haven't been any recent hardware changes. I did install Win7 in Oct., but there were no issues with that either. I used the computer fine two nights ago, and turned it off. Yesterday, I tried to turn it on, and got the error: "A Disk Read Error Occurred. Press CTRL ALT DEL to restart" So I restart, see the initial start screen (HP) and enter the BIOS. The hard drive and dvd drive appear to be listed, but the names are gibberish text. I tried putting a Windows disk in the dvd drive, and continued with the boot, but the disk did not get recognized. Even though the BIOS was set to check for optical media before the hard drive. Back to the error screen. If the computer would boot from a cd or dvd, I would just figure the hard drive needed replacing. But both being problematic worries me. Is this a matter of replacing both the hard drive and dvd drive, or might it be an indication of a bigger problem? Thanks for any advice.

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• Windows 7 explorer crashing trying to read external hard disk

  - by Mario De Schaepmeester

  I have a 1TB Western Digital hard drive which is almost full and last time I tried to plug it into my laptop, I got a Windows dialog saying "this hard drive needs to be formatted". I did not panic because I have experienced things like this before and I know it's often solved by simply re-inserting the drive. Now however, whenever I plug it in and try to browse it in explorer by going to "computer", the explorer process crashes after a while. I simply close explorer since it takes ages trying to read the disk and nothing happens. After searching on the internet, the best thing to do would be a chkdsk. I tried it via properties in explorer (which also took a good 5 minutes to open up), locks up as well, after waiting a couple of minutes it says there's no access to the disk so a chkdsk is not possible... I want to make clear that I always use safe removal before pulling out the USB cable. Last time however, safe removal just would not work and when trying to shut down Windows, the logoff screen just would not disappear (I've waited at least 10 minutes or so) and I powered off the PC by force. This may be the cause of the problems but the disk was still recognised immediately after that. I really don't want to format this thing because it contains C: clones of 3 computers and a lot of other stuff that I don't want to re-copy. What would be the best course of action? Update I got chkdsk working via the command line. I used the /F and /R options. I already got a bunch of lines saying "file record segment X is unreadable" or whatever it is in English, my OS is Dutch. It looks bad... Will chdsk repair these errors?

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• Advice on cloning disk

  - by hks

  I'm going to buy a second disk for backup, the same size as my laptops. I want to mount it in a casing via usb and backup an entire hdd every soemtime. That's because I want the posibility to just switch drives in case of something goes wrong. I'm using Linux and obviously the right tool seems to be dd. The thing is that my laptop drive has a speed of around 50-70 MB/s and usb 2.0 is 57 MB/s. So to copy my 250GB disk should take me more than 1 hour if I'm lucky. I can't wait this much. I want some differential backup. I read one of JWZ articles. In it he gives more details for using rsync on Mac. He writes that there is possibility of making rsync'ed disk bootable. So my question is: how to make rsync'ed hdd bootable under Linux or are there other 'quick backup' tools for Linux that would allow me to just swap drives? Or should I just stick to dd :( ?

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• where is my disk space?

  - by user166241

  I recently had a problem with .xsession-errors file - it became very big ( 90GB) and took all disk space: How I can check what takes disk space in /tmp?. I cleaned it with command > .xsession-errors but after an hour it became large again. So I deleted it (rm .xsession-errors) - it helped because it wasn't recreated but again after hour disk space disappeared - now there is no .xsession-errors anymore but I don't know where is the memory: df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 106640456 101223392 4 100% / udev 8166744 8 8166736 1% /dev tmpfs 3270224 972 3269252 1% /run none 5120 0 5120 0% /run/lock none 8175552 152 8175400 1% /run/shm du -sc * .[^.]* | sort -n 0 initrd.img 0 initrd.img.old 0 proc 0 sys 0 vmlinuz 0 vmlinuz.old 4 cdrom 4 lib64 4 media 4 mnt 4 selinux 8 dev 12 srv 16 lost+found 68 tmp 1124 run 3396 lib32 5164 .rpmdb 5540 root 8888 sbin 9120 bin 17132 etc 106080 opt 116956 boot 861908 lib 3530584 usr 3821836 var 13371260 home 21859112 total So there is around 100GB used but executing du -sc * .[^.]* | sort -n in root directory finds only ~21 GB - so what takes 80GB?? How to check it? I suspect that when I deleted the `.xsession-errors' file the errors were redirected somwhere else - but where?

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• How anti-virus on the host machne affects performance of virtual machines?

  - by Ladislav Mrnka

  I'm diagnosing some issue with Oracle virtual box where virtual machine sometimes perform terribly slow (much slower then notebook with worse configuration): Notebook i7 (2 cores with HT = 4 logical CPUs), 4GB RAM, 5400 rpm disk, Win 7 64bit Virtual machine (Oracle Virtual Box) Host: i7 (4 cores with HT = 8 logical CPUs, 12 GB RAM, system runs from SSD, virtual machine from 7200 rpm disk, Win 7 64bit) Virtual machine: 4 cores assigned, 8 GB RAM assigned, Win 2008 R2 Enterprise (64 bit) Virtual machine uses bridge to separate network interface (machine has two) VPN for network communication No other virtual machine runs on the host Host has installed ESET Smart Security All SW is updated with last version. My question is if anti-virus on the host machine can somehow affect performance of the virtual machine and if so how can I turn it off without turning the anti-virus itself?

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• SQLAuthority News – Statistics and Best Practices – Virtual Tech Days – Nov 22, 2010

  - by pinaldave

  I am honored that I have been invited to speak at Virtual TechDays on Nov 22, 2010 by Microsoft. I will be speaking on my favorite subject of Statistics and Best Practices. This exclusive online event will have 80 deep technical sessions across 3 days – and, attendance is completely FREE. There are dedicated tracks for Architects, Software Developers/Project Managers, Infrastructure Managers/Professionals and Enterprise Developers. So, REGISTER for this exclusive online event TODAY. Statistics and Best Practices Timing: 11:45am-12:45pm Statistics are a key part of getting solid performance. In this session we will go over the basics of the statistics and various best practices related to Statistics. We will go over various frequently asked questions like a) when to update statistics, b) different between sync and async update of statistics c) best method to update statistics d) optimal interval of updating statistics. We will also discuss the pros and cons of the statistics update. This session is for all of you – whether you’re a DBA or developer! You can register for this event over here. If you have never attended my session on this subject I strongly suggest that you attend the event as this is going to be very interesting conversation between us. If you have attended this session earlier, this will contain few new information which will for sure interesting to share with all. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: MVP, Pinal Dave, SQL, SQL Authority, SQL Joins, SQL Optimization, SQL Performance, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority News, T SQL, Technology Tagged: SQL Statistics, Statistics

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• SQL SERVER – Reduce the Virtual Log Files (VLFs) from LDF file

  - by pinaldave

  Earlier, I wrote a quite note on SQL SERVER – Detect Virtual Log Files (VLF) in LDF. Because of this I got responses suggesting too many VLFs are bad for log file. This prompts to a simple question: “How many is ‘too many’ VLFs?” I suggest that you go and read an article written by Kimberly over here. I am sure that you are going to have a clear understanding of what a good number for your VLFs is from that article. If you have lots of VLFs, you can reduce them right away using the following method: (I am just attempting to write a working script over here.) USE AdventureWorks GO BACKUP LOG AdventureWorks TO DISK='d:\adtlog.bak' GO -- Get Logical file name of the log file sp_helpfile GO DBCC SHRINKFILE(AdventureWorks_Log,TRUNCATEONLY) GO ALTER DATABASE AdventureWorks MODIFY FILE (NAME = AdventureWorks_Log,SIZE = 1GB) GO DBCC LOGINFO GO Again, here I have assumed that your initial log size is 1 GB, but in reality you should select the number based on your own ideal size of the log file. If your log file grows to 10 GB every day, you may want to put the value as 10 GB. For accuracy, read what Kimberly’s original article says over here. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, SQL, SQL Authority, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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• Help implementing virtual d-pad

  - by Moshe

  Short Version: I am trying to move a player around on a tilemap, keeping it centered on its tile, while smoothly controlling it with SneakyInput virtual Joystick. My movement is jumpy and hard to control. What's a good way to implement this? Long Version: I'm trying to get a tilemap based RPG "layer" working on top of cocos2d-iphone. I'm using SneakyInput as the input right now, but I've run into a bit of a snag. Initially, I followed Steffen Itterheim's book and Ray Wenderlich's tutorial, and I got jumpy movement working. My player now moves from tile to tile, without any animation whatsoever. So, I took it a step further. I changed my player.position to a CCMoveTo action. Combined with CCfollow, my player moves pretty smoothly. Here's the problem, though: Between each CCMoveTo, the movement stops, so there's a bit of a jumpiness introduced between movements. To deal with that, I changed my CCmoveTo into a CCMoveBy, and instead of running it once, I decided to have it CCRepeatForever. My plan was to stop the repeating action whenever the player changed directions or released the d-pad. However, when the movement stops, the player is not necessarily centered along the tiles, as it should be. To correctly position the player, I use a CCMoveTo and get the closest position that would put the player back into the proper position. This reintroduces an earlier problem of jumpiness between actions. What is the correct way to implement a smooth joystick while smoothly animating the player and keeping it on the "grid" of tiles? Edit: It turns out that this was caused by a "Bug Fix" in the cocos2d engine.

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