Hi all,
I have come across what is a potential bug in mdadm 2.6.7. (unless I am
missing something)
Environment:
Ubuntu Linux 8.0.4 64-bit (Hardy)
Intel dual socket quad-core server with 16GB RAM
10 SATA II 500GB hard drives
mdadm v2.6.7
Test 1: Attempt to grow linear md device with v1.0 superblock with
additional hard drive. Failed.
root@localhost:/usr/local/apache2/htdocs# mdadm --grow /dev/md6 --add
/dev/sdd1
mdadm: internal error - sb_offset is wrong
Aborted
Test 2: Attempt to grow linear md device with v1.0 superblock with
another linear md device with 1.0 superblock. Failed.
root@localhost:/usr/local/apache2/htdocs# mdadm --grow /dev/md6 --add
/dev/md5
mdadm: internal error - sb_offset is wrong
Aborted
Test 3: Attempt to grow linear md device with default 0.9 superblock
with additional hard drive. Success.
root@localhost:/usr/local/apache2/htdocs# mdadm -C -f -R /dev/md7 -l
linear -n 2 /dev/sdb1 /dev/sdc1
mdadm: array /dev/md7 started.
root@localhost:/usr/local/apache2/htdocs# mdadm --grow /dev/md7 --add
/dev/sdd1
root@localhost:/usr/local/apache2/htdocs# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md7 : active linear sdd1[2] sdc1[1] sdb1[0]
1025436608 blocks 64k rounding
unused devices: <none>
I would appreciate any thoughts on this. I definitely want to use the
more modern superblock version but I also need the ability to grow
linear md's.
Also, any plans on enabling "reshaping" or growth for RAID 0 and RAID
10 md's?
Thanks!
-Thomas
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