Re: trouble adding spare

Justin Piszcz wrote:

On Wed, 14 Jan 2009, Max Waterman wrote:

quoted

Max Waterman wrote:

quoted

quoted

If that does not work, clean the drive out manually after removing it as a spare from the array:
dd if=/dev/zero of=/dev/sdi bs=1M

This is taking forever

I stopped it after about half an hour, hoping that it had made garbage of whatever was the problem.

I then added it into the array and it worked as before.

However, it still wasn't added when I rebooted.

...but, there is something different. Now, when I --examine /dev/sdi, it gives output for the whole array including 2 spares, which is the end result I expect :

Active Devices : 6
Working Devices : 8
Failed Devices : 0
Spare Devices : 2

However, --detail /dev/md2 still denies /dev/sdi exists :

Active Devices : 6
Working Devices : 7
Failed Devices : 0
Spare Devices : 1

What's up?

Max.

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The superblock is at the end of the disk for 0.90.00 superblocks, so you would need to write to end of the disk or just let dd clear out the entire disk.  Honestly though that may not fix the root cause of the problem, we may need to wait for others on the list and/or Neil to check this one out. It seems very strange, can you post the regular output that people ask for so once they see your mail, they will have (hopefully) most of what they need to diagnose the problem.

1. mdadm -D /dev/mdX
2. cat /proc/mdstat
3. mdadm -Esvvv
4. uname -a

5. mdadm -E /dev/sdi

OK, I uploaded the output of the above commands to here :

<http://reality.sgiweb.org/maxw/tmp/md2Details/>

I hope someone can shed some light on this.

Thanks,

Max.