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

From: Justin Piszcz
Date: Fri Jul 07 2006 - 08:44:37 EST


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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