Mikael Abrahamsson <swmike <at> swm.pp.se> writes:
>
> On Wed, 26 Mar 2014, Tide wrote:
>
> > The partition size of each disk in the two arrays are identical (all
> > partitions have 5860531087 logical sectors), so why the array size are
> > different? Is it caused by different mdadm version (I guess so) or
> > different array level or something else?
>
> Do mdadm -E on one component device from each md volume. My first guess
> would be different data offset.
>
Yes, the data offset are different. But why? When creating array, I didn't
specified any other options:
mdadm -C /dev/md127 -l 5 -n 3 /dev/sd[bcd]1
mdadm --add /dev/md127 /dev/sd[ef]1
mdadm --grow /dev/md127 -n 4
mdadm -C /dev/md127 -l 6 -n 5 /dev/sd[bcdef]1
=================
Array 1 (RAID 5):
=================
# mdadm --examine /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : dfd3bbe7:4b0231fe:9007bc4a:e106acac
Name : RecordBackup01:127 (local to host RecordBackup01)
Creation Time : Fri Jan 11 17:56:18 2013
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 5860529039 (2794.52 GiB 3000.59 GB)
Array Size : 8790792192 (8383.55 GiB 9001.77 GB)
Used Dev Size : 5860528128 (2794.52 GiB 3000.59 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
Unused Space : before=1968 sectors, after=911 sectors
State : active
Device UUID : 85fa01f1:b8e7875c:5f19039f:b198c0bb
Update Time : Thu Mar 27 03:35:06 2014
Checksum : 16ff8ff5 - correct
Events : 7266
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing)
=================
Array 2 (RAID 6):
=================
# mdadm --examine /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 923c9658:12739258:506fc8b0:f8c5edf3
Name : RecordBackup02:127 (local to host RecordBackup02)
Creation Time : Fri Mar 21 18:12:00 2014
Raid Level : raid6
Raid Devices : 5
Avail Dev Size : 5860268943 (2794.39 GiB 3000.46 GB)
Array Size : 8790402048 (8383.18 GiB 9001.37 GB)
Used Dev Size : 5860268032 (2794.39 GiB 3000.46 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262056 sectors, after=911 sectors
State : clean
Device UUID : 94a83f3f:33991f7a:9545d12f:87bd169f
Internal Bitmap : 8 sectors from superblock
Update Time : Thu Mar 27 01:55:49 2014
Bad Block Log : 512 entries available at offset 72 sectors
Checksum : 5a7094a4 - correct
Events : 8178
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing)
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