Re: trouble adding spare

[Max Waterman <davidmaxwaterman@fastmail.co.uk>]

Justin Piszcz wrote:
>
>
> On Wed, 14 Jan 2009, Max Waterman wrote:
>
>> Max Waterman wrote:
>>>>
>>>> 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.