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Mdadm Cannot Reshape Array Without Increasing Size Yet


I just converted a 3-drive RAID-5 array to a 4-drive RAID-6 array, with exactly one simple command. Privacy policy About Linux Raid Wiki Disclaimers Once you have a degraded 2-drive RAID4 (i.e. If an array is using a write-intent bitmap, then devices which have been removed can be re-added in a way that avoids a full reconstruction but instead just updates the blocks http://usableflash.com/mdadm-cannot/mdadm-cannot-start-dirty-degraded-array.php

If the array has a write-intent bitmap, it is strongly recommended that you remove the bitmap before increasing the size of the array. For arrays with persistent metadata (superblocks) this is done automatically. a) A tool to allow me to grow a RAID partition into empty space beyond it in the disk. and fails.

Mdadm Convert Raid5 To Raid6

A suffix of 'M' or 'G' can be given to indicate Megabytes or Gigabytes respectively. -W, --write-mostly subsequent devices listed in a --build, --create, or --add command will be flagged as You could allocate the whole drive to the RAID, but usually 250gb of disk is worthwhile, so it is much nicer to use that 250gb for something else temporarily like online To reclaim some space immediately, if your drive is formatted ext3/4, you could use "tune2fs -m0 /dev/sdb1" to reduce the reservation from 5% to 0%. as soon as I get to boot and play with the partitions I'll post updates.

See md(4) for more detail about 'near', 'offset', and 'far'. I know the data must still be on there. when creating /dev/md/home the name will default to home. -R, --run Insist that mdadm run the array, even if some of the components appear to be active in another array or Man Mdadm This is the part that bothers me.

What *are* you trying to do?? Mdadm Change Chunk Size This creates a CONTAINER which is managed in a similar manner to DDF, and is supported by an option-rom on some platforms: http://www.intel.com/design/chipsets/matrixstorage_sb.htm --homehost= This will override any HOMEHOST setting I would like to add another 1.5TB-drive, but I do not like to split this new drive into 3 * 500GB, as then failing this single 1.5TB drive would render my Tutorial Info Author: falko Tags: linux Share This Page Tweet Xenforo skin by Xenfocus Contact Help Imprint Tutorials Top RSS-Feed Terms Howtoforge © projektfarm GmbH.

HDD#2 is well partitioned and RAID1's are hopefully still running.Are md0 and md1 (RAID1) still running after the rebuild?Quote:md1 : active raid1 sda2[0] sdc2[3] sdd2[2] sdb2[1] 497920 blocks [4/4] [UUUU] md0 Raid 5 Vs Raid 6 An array which requires --force to be started may contain data corruption. For most of the time there is a gap in the devices between where data in the old layout in being read, and where data in the new layout is being b) Seriously, what is the right way to do it.

Mdadm Change Chunk Size

For version-0.90 superblocks, part of the SHA1 hash of the hostname will be stored in the later half of the UUID. http://www.linuxsolved.com/forums/index.php?topic=3631.0 When a device is added to an active array, mdadm checks to see if it has metadata on it which suggests that it was recently a member of the array. Mdadm Convert Raid5 To Raid6 Using --brief with --verbose gives an intermediate level of verbosity. Monitor Mode Usage: mdadm --monitor options... Mdadm Grow And it's worked awesome switching between 4 different motherboards now, always detects everything no problem, awesome.

imsm Use the Intel(R) Matrix Storage Manager metadata format. Check This Out This can be useful when an indirect specifier such as missing, detached or faulty is used in requesting an operation on the array. --test will report failure if these specifiers didn't These layouts are: left-symmetric-6, right-symmetric-6, left-asymmetric-6, right-asymmetric-6, and parity-first-6. e2fsck -f /dev/md0resize2fs /dev/md0 « Last Edit: May 14, 2010, 05:22:36 AM by gauravbajaj » Logged Print Pages: [1] « previous next » Linux Forums - Linux Help,Advice & support community:LinuxSolved.com Mdadm Raid

mdadm -S /dev/md0 mdadm -C /dev/md0 -l5 -n2 /dev/A missing -x1 /dev/C wait for resync mdadm -G /dev/md0 -n 3 wait for reshape to complete. The array is the root of my Linux system, and it didn't even hiccup as the conversion happened. christian [permalink][hide] Re: Converting RAID5 to RAID6 and other shape changing in md/raid (18 October 2009, 12:19 UTC) christian: You can stack the MD levels... Source When the two new disks arrive in a couple weeks, it would be easy to add them to the array. (they are 2TB, not 1,5TB thou...).

If an array has a bitmap, it must be removed before the size can be changed. Raid Calculator If you just want to change the chunk size, the new mdadm will do that for you mdadm --grow /dev/mdX --chunk-size=128 If you want to reduce the number of devices in Everything was running OK but just miserably slow.

Tried both suggestions with no luck.

Usage: mdadm --assemble --scan md-devices-and-options... It's really getting complicated. In particular, before reducing the number of devices in a RAID5 or RAID6 you must first reduce the size of the array using the new --array-size= option to mdadm --grow. Follow or Monitor Monitor one or more md devices and act on any state changes.

There are also 4 layouts that will provide an intermediate stage for converting between RAID5 and RAID6. The different sub-versions store the superblock at different locations on the device, either at the end (for 1.0), at the start (for 1.1) or 4K from the start (for 1.2). "1" But mdadm wasn't having it, it told me: mdadm level of /dev/md3 changed to raid6 mdadm: /dev/md3: Cannot grow - need backup-file mdadm: aborting level change With the --backup-file argument everything have a peek here See below in MISC MODE for details. -W, --wait For each md device given, wait for any resync, recovery, or reshape activity to finish before returning.

So it is always good to be cautious. You will now have to repeat the above steps for *each* disk in your array. Layout : left-symmetric . May be we've to mark it as failed and remove it, than add it againCode:mdadm /dev/md0 -f /dev/sdb1 -r /dev/sdb1 -a /dev/sdb1mdadm /dev/md1 -f /dev/sdb2 -r /dev/sdb2 -a /dev/sdb2mdadm /dev/md2 -f

If --scan is also given, then any auto= entries in the config file will override the --auto instruction given on the command line. All events cause the program to be run. Very confused!!!!PostPosted: Mon Sep 22, 2008 1:18 pm Offline Newbie Joined: Tue Sep 09, 2008 4:32 pm Posts: 11 First off, I cannot thank you enough for your continued help.