problem in grow of raid5 3 -> 4 disks

problem in grow of raid5 3 -> 4 disks

[Redeeman]

Hello.

A friend of mines array just stalled in the reshape process, while
growing from 3 to 4 disks, on raid5.

kernel is 2.6.27,

dmesg spews insane amounts of:
compute_blocknr: map not correct
compute_blocknr: map not correct
compute_blocknr: map not correct
compute_blocknr: map not correct

/proc/mdstat:
md0 : active raid5 sdd1[3] sdc1[2] sdb1[1] sda1[0]
      1953519872 blocks super 0.91 level 5, 64k chunk, algorithm 2 [4/4]
[UUUU]
      [==============>......]  reshape = 73.2% (715827840/976759936)
finish=15504.9min speed=280K/sec

# mdadm --detail:
/dev/md0:
        Version : 0.91
  Creation Time : Sun Feb  1 03:30:50 2009
     Raid Level : raid5
     Array Size : 1953519872 (1863.02 GiB 2000.40 GB)
  Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 0
    Persistence : Superblock is persistent
 
    Update Time : Tue Feb 17 23:26:37 2009
          State : clean, recovering
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0
 
         Layout : left-symmetric
     Chunk Size : 64K
 
 Reshape Status : 73% complete
  Delta Devices : 1, (3->4)
 
           UUID : e55b3e10:456492af:b4421a5d:cd497c91
         Events : 0.476018
 
    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1
       2       8       33        2      active sync   /dev/sdc1
       3       8       49        3      active sync   /dev/sdd1


What should we do about this? Anyone experienced something similar?
SMART reports no errors on any of the disks.

---
Thanks.
Kasper Sandberg

RE: problem in grow of raid5 3 -> 4 disks

[Redeeman]

(sorry its not properly threaded, but message didnt show up via
mailinglist yet)

To add some information, i think the culprit is that he forgot support
for large block devices in kernel (its 32bit x86)..

What is the recommendation based on this? enable support, and reboot?


Thanks again.

RE: problem in grow of raid5 3 -> 4 disks

[Kasper Sandberg]

Hello again

Seems he was impatient, and just recompiled kernel and rebooted - and it
worked, it continued the reshape and all is well :)

On Tue, 2009-02-17 at 22:12 +0100, Redeeman wrote:
> (sorry its not properly threaded, but message didnt show up via
> mailinglist yet)
> 
> To add some information, i think the culprit is that he forgot support
> for large block devices in kernel (its 32bit x86)..
> 
> What is the recommendation based on this? enable support, and reboot?
> 
> 
> Thanks again.
> 
> --
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