md wierdness with 2.6.0test9

md wierdness with 2.6.0test9

[Brad Langhorst]

I have a pretty simple little raid 1 

/dev/hda1 and /dev/hdc1 should be mirrors of each other.

i created the raid like this

mdadm --create --level 1 -n 2 /dev/md0 /dev/hdc1 missing
(this is from memory - just to give you an idea of how this happened)

i also created /dev/md1 for swap
mdadm --create --level 1 -n 2 /dev/md1 /dev/hdc2 /dev/hda2


now when i go to add /dev/hda1 to the array all looks fine

mdadm --zero-superblock /dev/hda1

mdadm --add /dev/md0 /dev/hda1

array syncs up but i see this wierdness (it exists across reboots)
from mdadm --details /dev/md0

Number 	Major 	Minor 	RaidDevice	State
0	22	1	0		active sync /dev/hdc1
1	0	0	-1		removed
2	3	1	1		spare /dev/hda1

rebooting to a 2.4 series kernel appears to fix this problem...

In my search for information I read this post
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=utf-8&threadm=rvg0.5x4.17%40gated-at.bofh.it&rnum=4&prev=/groups%3Fq%3Dmdadm%2Bfaulty%2Bremoved%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3Dutf-8%26selm%3Drvg0.5x4.17%2540gated-at.bofh.it%26rnum%3D4
which talks about patching md.c to fix a similar problem...

In test9 the patch discussed is already applied 
so it either doesn't fix the problem or this problem is not the same
problem 

best wishes

brad

Re: md wierdness with 2.6.0test9

[Dick Streefland]

Brad Langhorst <brad@langhorst.com> wrote:
| array syncs up but i see this wierdness (it exists across reboots)
| from mdadm --details /dev/md0
| 
| Number 	Major 	Minor 	RaidDevice	State
| 0	22	1	0		active sync /dev/hdc1
| 1	0	0	-1		removed
| 2	3	1	1		spare /dev/hda1
| 
| rebooting to a 2.4 series kernel appears to fix this problem...

Mmm, this looks familiar to me. See my email to linux-raid:

  http://www.spinics.net/lists/raid/msg03610.html

The patch in one of the replies fixed the problem for me.
However, this patch hasn't been included in Linus' kernel yet.

-- 
Dick Streefland                    ////               De Bilt
dick.streefland@xs4all.nl         (@ @)       The Netherlands
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