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  • Defeating the RAID5 write hole with ZFS (but not RAID-Z) [closed]

    - by Michael Shick
    I'm setting up a long-term storage system for keeping personal backups and archives. I plan to have RAID5 starting with a relatively small array and adding devices over time to expand storage. I may also want to convert to RAID6 down the road when the array gets large. Linux md is a perfect fit for this use case since it allows both of the changes I want on a live array and performance isn't at all important. Low cost is also great. Now, I also want to defend against file corruption, so it looked like a RAID-Z1 would be a good fit, but evidently I would only be able to add additional RAID5 (RAID-Z1) sets at a time rather than individual drives. I want to be able to add drives one at a time, and I don't want to have to give up another device for parity with every expansion. So at this point, it looks like I'll be using a plain ZFS filesystem on top of an md RAID5 array. That brings me to my primary question: Will ZFS be able to correct or at least detect corruption resulting from the RAID5 write hole? Additionally, any other caveats or advice for such a set up is welcome. I'll probably be using Debian, but I'll definitely be using Linux since I'm familiar with it, so that means only as new a version of ZFS as is available for Linux (via ZFS-FUSE or so).

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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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  • Self-hosted image gallery

    - by Robert Munteanu
    I'd like to host an image gallery for family and friends. Is there any solution out here which offers: albums ( I expect most do ); ability to specificy tags/persons/places etc, similar to what f-spot does; an API to upload multiple photos or just a bulk uploader; block out unregistered users; allow users to leave comments. Update: please do assume that I'm able to host the service myself if I've asked for a self-hosted solution.

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  • Recommendations for screen-capture tool that retains menus and mouse pointer

    - by Chris Farmer
    There are several screen capture tool questions already on this site, but I think I have a slight tweak to the usual. I'd like a handy screen capture utility that can: Run in Windows 7 Capture a sub-region of the screen Show the current state of the mouse cursor and any active menus I'd like to use it for writing docs that refer to specific application menu items. I like the built-in snipping tool in Windows 7, but the act of using it dismisses my menus, and it doesn't get the mouse cursor either. Do any such tools exist? EDIT: Ahh, I wasn't familiar with the "delayed capture" options of these tools, but they all seem to fit the bill. Thanks!

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  • Restrict programs from accessing the Internet

    - by n0v1c3c0d3r
    I have a 256 kbit/s Internet connection. Most often, I find that the browsing speed is too slow. I have to use TCPView (SysInternals) to find out which program is accessing the Internet without my knowledge and terminate it. Previously I was using ZoneAlarm to control Internet access by installed programs. But as it doesn't work for Windows 7, I'm left with no option. Is there any other tool which serves the purpose?

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  • How to partition a Flash Drive?

    - by Nrew
    Do you know of any way on how to partition a flash drive. Specifically an 8gb toshiba flash drive. I have tried using lexar usb format:http://tinyurl.com/m7qkbw But there was no luck, Do yo know of any application that could do flash drive partitioning. I really wanted to have a bootable flash drive but can still store my files on a different partition.

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  • Is there a program that gives the result of a chemical reaction?

    - by Semyon Perepelitsa
    Is there a program where I can type one, two or more components of chemical reaction and find out the result of it? For example, I enter "N2 + H2" and it gives me "N2 + H2 ? NH3". Or "C10H8 + O2" and it shows "C10H8 + O2 ? CO2 + H2O". I don't need coefficient calculator, where I type full reaction and it calculates coefficients (marked bold in next example): C10H8 + 12 O2 = 10 CO2 + 4 H2O.

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  • Free Windows Application Blocker/Monitor

    - by Click Ok
    I want a free application monitor that when detects certain keywords on window title by example, it closes the application (or prevents that it opens/install). Nice extra will be if the program log the application activity too and internet sites accessed by any browser. Thank you very much! PS: I'm using Windows 7 Ultimate.

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  • RAID Volume is no longer showing in Raid Controller BIOS and in Windows

    - by Gordon
    Hi all, I have installed some critical Windows Updates yesterday and now my external RAID Volume no longer shows in Windows Vista x64. All updates went through successfully. For their description, I cannot see how they should relate to the issue, but this is the only change that happened, so who knows. Anyway, here is the details: I have an external eSata enclosure that is running on a SiI4726 controller. I can connect to the controller with it's management utility from the computer the enclosure is connected to. The three drives in the enclosure show up as JBODs. I had those drives configured to be one logical RAID5 drive. RAID management is done through a SiI3132 SoftRaid controller. The Raid Management Utility just shows empty channels where it usually shows the Raid Group. In the Windows Disk Manager, I can see an unknown unitialized device. This is fine according to the setup manual. What it doesn't show is my Raid drive. It's gone. Also, when booting Windows, the BIOS of the controller used to show the RAID volume before booting the OS. This is not happening anymore. Updating drivers and firmware did not help. I have made sure the drivers and firmware are compatible to each others. And like I said, it used to work before. Any clues?

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  • What are the good alternatives to Windows Movie Maker in Vista?

    - by GeneQ
    Short of getting a Mac and using iMovie, what are the alternatives that you'll recommend to a non-profit organization that needs to produce simple (but polished) videos to showcase their community service activities to raise funds. Currently they are using Windows Movie Maker but have sort of outgrown it. I installed Jashaka for them, and understandably, they couldn't grok it at all. Their current system is powerful enough to handle most video editing tasks.

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  • Recommend Online password manager [closed]

    - by Dmitriy Nagirnyak
    Possible Duplicate: online password manager with sharing capabilities Hi, I am looking for a good online password manager with the following requirements: Single click login from browser. Single click form saving from the browser. Not attached to a single PC. Offline version (so I can use it if there is no internet, for example plug USB and have last sync-ed data). Ability to store plain text (notes, for example). Should work on Windows, Linux and Mac. So far I have been happy with RoboForm, but its offline USB version is not available on Linux. Please recommend. Thanks, Dmitriy.

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  • Uninstaller that can work with failed installs

    - by Nifle
    I'd like an application that can uninstall applications that does not show up in the normal add/remove applications. I have an application that failed to install properly. It installs half way and then crashes leaving short cuts, folders with exe and config files in and some stuff in the registry. Ideally I would like to be able to point the uninstaller to the install dir and tell it to remove everything that references files in that dir.

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  • Which browsers support Window's Low Integrity level?

    - by Ian Boyd
    Normally i like running ie, but it's rendering speed at high-dpi is poor. More recently i've switched to Chrome, but it does not support high-dpi displays. i'm interested in trying other browsers, but they must support protected mode. Are there any other browsers, besides IE and Chrome, that support Mandatory Integrity Levels (i.e. protected mode)? Browsers that i do know about: Browser Protected Mode High-dpi Aware ============== =============== ============== Internet Explorer Yes Yes Chrome Yes No Firefox No No Opera No No Are there any other? And just as an fyi, the clear, unambiguous, non-argumentative, non-subjective, question is: Are there any browsers, aside from Internet Explorer, available for Windows, that run at the Windows Low Mandatory integrity level, and support high-dpi (i.e. non-96 dpi) displays?

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  • Why do I get a DegradedArray event with mdadm

    - by azera
    Hello Just so we're clear on what's happening: I bought 4 new sata 2 drives, with the intent of using them in a raid5 all drive are fully recognised by both my bios and my linux box (gentoo) I created a raid5 array, fiddled a bit with it to understand how it works, how to monitor ect At some point, this triggered a degradedarray event, even though the array is brand new. I tried to stopping the array and recreating a new array with the same drive but the new array starts degraded too. here is what I used to create it mdadm --create -l5 -n4 /dev/md/md0-r5 /dev/sdb /dev/sdd /dev/sde /dev/sdf here are the output from my /proc/mdstat and mdadm --detail --scan **mdstat** Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md127 : active raid5 sdf[4] sde[2] sdd[1] sdb[0] 4395415488 blocks level 5, 64k chunk, algorithm 2 [4/3] [UUU_] [>....................] recovery = 2.8% (41689732/1465138496) finish=890.3min speed=26645K/sec unused devices: <none> **detail** ARRAY /dev/md/md0-r5 metadata=0.90 spares=1 UUID=453e2833:81f22a74:64188b84:66721085 As such I have a couple questions: does a raid5 array always start in degraded mode at first ? why does sdf have the number 4 between bracket instead of 3, why does it see a spare disk and why is the 4th drive marked with _ instead of U ? (bad configuration ?) How can I recreate the array from scratch, do i have to format each drive on its own before recreating it ? Thanks for any help, I'm not sure about what I should do at the moment

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  • alternatives to altaris/symentec SVS

    - by The Journeyman geek
    I use an old copy of altaris SVS (link to lifehacker - symentec gutted the old altaris website) for testing applications - it lets me capture the changes one executable makes, or changes to a whole system into a bundle, and remove the whole bundle once i'm done. However symentec bought over altaris and apparently killed off the product, or merged it into some other bigger product. I'd like the same fine grained control SVS had, something that just does this, and preferably free (for personal use) or not too expensive. I'd like this to run on at least windows XP 32 bit, but windows 7 and 64 bit support would be nice too

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  • pkgadd solaris 10 on VMWare - process datastream failed for SUNWi1cs errno=2

    - by Mike-M
    I am trying to install packadges SUNWi1cs and SUNWi15cs for Oracle 11g on Solaris 10 (VMWare Player). NO cdrom (I dont know how to mount it the iso file is on USB device), I transferd the ISO and unzip the ISO in a directory I run: "pkgadd -d /export/michel/SOLARIS_10/PRODUCT SUNi1cs" == process datastream failed ... errno=2. I've check the web without success, many answers but none that fit my prob. Thank you

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  • Openfiler RAID 10 option not found

    - by chrisling106
    Hi, I'm building a NAS using Openfiler2.3 (from 32-bit ISO), first of all I want to experiment it on VM first before going out and buy the harddrives needed. I created 5 virtual drives on VMware, sda is 2GB and the rest 1GB each (sdb to sde). I left sda blank and want to setup a RAID 10 disk using sdb, sdc, sdd and sde, 4 RAID partitions are setup successfully, but when I try to create a RAID device the only option for RAID level is 1, 0, 5 and 6. RAID 10 is not there! Can someone let me know what have I missed, please? TIA.

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  • Hosted version of Yahoo! answers [closed]

    - by Neil
    Hi all. Does anyone know of a hosted version of Yahoo! Answers (or Stackoverflow/Superuser) that I could integrate with my site? I know that there are some open-source implementations (see http://meta.stackoverflow.com/questions/2267/stack-overflow-clones?page=1&tab=votes#tab-top) but I'd rather have some hosted if possible. I know there is http://stackexchange.com/ as well, but I really want some tight integration with the rest of my site. Failing that, has anyone got any experience with the open source versions? Some of them look a little, erm, unfinished... Thanks. Neil.

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  • What will happen with my RAID5 after motherboard change?

    - by abatishchev
    Currently I have ASUS P5Q-EM and 3 HDD in RAID5 using it's on-board RAID controller Intel ICH10R. I want to bye a new motherboard, for example, Gigabyte GA-EQ45M-S2 which also have on-board RAID controller, but Intel ICH10DO. What will happen with my data on RAID5? Will I have to re-create the array from the scratch and lost all my data? Is such array a soft RAID or soft-hard? What if my current motherboard will broken? What will happen with my data?

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  • Degraded RAID5 and no md superblock on one of remaining drive

    - by ark1214
    This is actually on a QNAP TS-509 NAS. The RAID is basically a Linux RAID. The NAS was configured with RAID 5 with 5 drives (/md0 with /dev/sd[abcde]3). At some point, /dev/sde failed and drive was replaced. While rebuilding (and not completed), the NAS rebooted itself and /dev/sdc dropped out of the array. Now the array can't start because essentially 2 drives have dropped out. I disconnected /dev/sde and hoped that /md0 can resume in degraded mode, but no luck.. Further investigation shows that /dev/sdc3 has no md superblock. The data should be good since the array was unable to assemble after /dev/sdc dropped off. All the searches I done showed how to reassemble the array assuming 1 bad drive. But I think I just need to restore the superblock on /dev/sdc3 and that should bring the array up to a degraded mode which will allow me to backup data and then proceed with rebuilding with adding /dev/sde. Any help would be greatly appreciated. mdstat does not show /dev/md0 # cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] md5 : active raid1 sdd2[2](S) sdc2[3](S) sdb2[1] sda2[0] 530048 blocks [2/2] [UU] md13 : active raid1 sdd4[3] sdc4[2] sdb4[1] sda4[0] 458880 blocks [5/4] [UUUU_] bitmap: 40/57 pages [160KB], 4KB chunk md9 : active raid1 sdd1[3] sdc1[2] sdb1[1] sda1[0] 530048 blocks [5/4] [UUUU_] bitmap: 33/65 pages [132KB], 4KB chunk mdadm show /dev/md0 is still there # mdadm --examine --scan ARRAY /dev/md9 level=raid1 num-devices=5 UUID=271bf0f7:faf1f2c2:967631a4:3c0fa888 ARRAY /dev/md5 level=raid1 num-devices=2 UUID=0d75de26:0759d153:5524b8ea:86a3ee0d spares=2 ARRAY /dev/md0 level=raid5 num-devices=5 UUID=ce3e369b:4ff9ddd2:3639798a:e3889841 ARRAY /dev/md13 level=raid1 num-devices=5 UUID=7384c159:ea48a152:a1cdc8f2:c8d79a9c With /dev/sde removed, here is the mdadm examine output showing sdc3 has no md superblock # mdadm --examine /dev/sda3 /dev/sda3: Magic : a92b4efc Version : 00.90.00 UUID : ce3e369b:4ff9ddd2:3639798a:e3889841 Creation Time : Sat Dec 8 15:01:19 2012 Raid Level : raid5 Used Dev Size : 1463569600 (1395.77 GiB 1498.70 GB) Array Size : 5854278400 (5583.08 GiB 5994.78 GB) Raid Devices : 5 Total Devices : 4 Preferred Minor : 0 Update Time : Sat Dec 8 15:06:17 2012 State : active Active Devices : 4 Working Devices : 4 Failed Devices : 1 Spare Devices : 0 Checksum : d9e9ff0e - correct Events : 0.394 Layout : left-symmetric Chunk Size : 64K Number Major Minor RaidDevice State this 0 8 3 0 active sync /dev/sda3 0 0 8 3 0 active sync /dev/sda3 1 1 8 19 1 active sync /dev/sdb3 2 2 8 35 2 active sync /dev/sdc3 3 3 8 51 3 active sync /dev/sdd3 4 4 0 0 4 faulty removed [~] # mdadm --examine /dev/sdb3 /dev/sdb3: Magic : a92b4efc Version : 00.90.00 UUID : ce3e369b:4ff9ddd2:3639798a:e3889841 Creation Time : Sat Dec 8 15:01:19 2012 Raid Level : raid5 Used Dev Size : 1463569600 (1395.77 GiB 1498.70 GB) Array Size : 5854278400 (5583.08 GiB 5994.78 GB) Raid Devices : 5 Total Devices : 4 Preferred Minor : 0 Update Time : Sat Dec 8 15:06:17 2012 State : active Active Devices : 4 Working Devices : 4 Failed Devices : 1 Spare Devices : 0 Checksum : d9e9ff20 - correct Events : 0.394 Layout : left-symmetric Chunk Size : 64K Number Major Minor RaidDevice State this 1 8 19 1 active sync /dev/sdb3 0 0 8 3 0 active sync /dev/sda3 1 1 8 19 1 active sync /dev/sdb3 2 2 8 35 2 active sync /dev/sdc3 3 3 8 51 3 active sync /dev/sdd3 4 4 0 0 4 faulty removed [~] # mdadm --examine /dev/sdc3 mdadm: No md superblock detected on /dev/sdc3. [~] # mdadm --examine /dev/sdd3 /dev/sdd3: Magic : a92b4efc Version : 00.90.00 UUID : ce3e369b:4ff9ddd2:3639798a:e3889841 Creation Time : Sat Dec 8 15:01:19 2012 Raid Level : raid5 Used Dev Size : 1463569600 (1395.77 GiB 1498.70 GB) Array Size : 5854278400 (5583.08 GiB 5994.78 GB) Raid Devices : 5 Total Devices : 4 Preferred Minor : 0 Update Time : Sat Dec 8 15:06:17 2012 State : active Active Devices : 4 Working Devices : 4 Failed Devices : 1 Spare Devices : 0 Checksum : d9e9ff44 - correct Events : 0.394 Layout : left-symmetric Chunk Size : 64K Number Major Minor RaidDevice State this 3 8 51 3 active sync /dev/sdd3 0 0 8 3 0 active sync /dev/sda3 1 1 8 19 1 active sync /dev/sdb3 2 2 8 35 2 active sync /dev/sdc3 3 3 8 51 3 active sync /dev/sdd3 4 4 0 0 4 faulty removed fdisk output shows /dev/sdc3 partition is still there. [~] # fdisk -l Disk /dev/sdx: 128 MB, 128057344 bytes 8 heads, 32 sectors/track, 977 cylinders Units = cylinders of 256 * 512 = 131072 bytes Device Boot Start End Blocks Id System /dev/sdx1 1 8 1008 83 Linux /dev/sdx2 9 440 55296 83 Linux /dev/sdx3 441 872 55296 83 Linux /dev/sdx4 873 977 13440 5 Extended /dev/sdx5 873 913 5232 83 Linux /dev/sdx6 914 977 8176 83 Linux Disk /dev/sda: 1500.3 GB, 1500301910016 bytes 255 heads, 63 sectors/track, 182401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 66 530113+ 83 Linux /dev/sda2 67 132 530145 82 Linux swap / Solaris /dev/sda3 133 182338 1463569695 83 Linux /dev/sda4 182339 182400 498015 83 Linux Disk /dev/sda4: 469 MB, 469893120 bytes 2 heads, 4 sectors/track, 114720 cylinders Units = cylinders of 8 * 512 = 4096 bytes Disk /dev/sda4 doesn't contain a valid partition table Disk /dev/sdb: 1500.3 GB, 1500301910016 bytes 255 heads, 63 sectors/track, 182401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 * 1 66 530113+ 83 Linux /dev/sdb2 67 132 530145 82 Linux swap / Solaris /dev/sdb3 133 182338 1463569695 83 Linux /dev/sdb4 182339 182400 498015 83 Linux Disk /dev/sdc: 1500.3 GB, 1500301910016 bytes 255 heads, 63 sectors/track, 182401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdc1 1 66 530125 83 Linux /dev/sdc2 67 132 530142 83 Linux /dev/sdc3 133 182338 1463569693 83 Linux /dev/sdc4 182339 182400 498012 83 Linux Disk /dev/sdd: 2000.3 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdd1 1 66 530125 83 Linux /dev/sdd2 67 132 530142 83 Linux /dev/sdd3 133 243138 1951945693 83 Linux /dev/sdd4 243139 243200 498012 83 Linux Disk /dev/md9: 542 MB, 542769152 bytes 2 heads, 4 sectors/track, 132512 cylinders Units = cylinders of 8 * 512 = 4096 bytes Disk /dev/md9 doesn't contain a valid partition table Disk /dev/md5: 542 MB, 542769152 bytes 2 heads, 4 sectors/track, 132512 cylinders Units = cylinders of 8 * 512 = 4096 bytes Disk /dev/md5 doesn't contain a valid partition table

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