Re: trouble adding spare

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

Can no one provide any enlightenment on this issue?

Max.

Max Waterman wrote:
> 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.
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