Re: Kernel 2.6.17 and RAID5 Grow Problem (critical section backup)

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On Fri, 7 Jul 2006, Justin Piszcz wrote:

p34:~# mdadm /dev/md3 -a /dev/hde1
mdadm: added /dev/hde1

p34:~# mdadm -D /dev/md3
/dev/md3:
       Version : 00.90.03
 Creation Time : Fri Jun 30 09:17:12 2006
    Raid Level : raid5
    Array Size : 1953543680 (1863.04 GiB 2000.43 GB)
   Device Size : 390708736 (372.61 GiB 400.09 GB)
  Raid Devices : 6
 Total Devices : 7
Preferred Minor : 3
   Persistence : Superblock is persistent

   Update Time : Fri Jul  7 08:25:44 2006
         State : clean
Active Devices : 6
Working Devices : 7
Failed Devices : 0
 Spare Devices : 1

        Layout : left-symmetric
    Chunk Size : 512K

          UUID : e76e403c:7811eb65:73be2f3b:0c2fc2ce
        Events : 0.232940

   Number   Major   Minor   RaidDevice State
      0      22        1        0      active sync   /dev/hdc1
      1      56        1        1      active sync   /dev/hdi1
      2       3        1        2      active sync   /dev/hda1
      3       8       49        3      active sync   /dev/sdd1
      4      88        1        4      active sync   /dev/hdm1
      5       8       33        5      active sync   /dev/sdc1

      6      33        1        -      spare   /dev/hde1
p34:~# mdadm --grow /dev/md3 --raid-disks=7
mdadm: Need to backup 15360K of critical section..
mdadm: Cannot set device size/shape for /dev/md3: No space left on device
p34:~# mdadm --grow /dev/md3 --bitmap=internal --raid-disks=7
mdadm: can change at most one of size, raiddisks, bitmap, and layout
p34:~# umount /dev/md3
p34:~# mdadm --grow /dev/md3 --raid-disks=7
mdadm: Need to backup 15360K of critical section..
mdadm: Cannot set device size/shape for /dev/md3: No space left on device
p34:~#

The disk only has about 350GB of 1.8TB used, any idea why I get this error?

I searched google but could not find anything on this issue when trying to grow the array?


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Is it because I use a 512kb chunksize?

Jul 7 08:44:59 p34 kernel: [4295845.933000] raid5: reshape: not enough stripes. Needed 512 Jul 7 08:44:59 p34 kernel: [4295845.962000] md: couldn't update array info. -28

So the RAID5 reshape only works if you use a 128kb or smaller chunk size?

Justin.
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