Re: convert raid10 to raid0

["Tóth Csaba" <csaba.toth@i3rendszerhaz.hu>]

2010.07.08. 9:58 keltezéssel, Tóth Csaba írta:
> 2010.07.08. 0:50 keltezéssel, Neil Brown írta:
>> Then after you create the raid0, use the same command
>>    mdadm -E /dev/sdc6
>> to check the Data Offset again and make sure it is the same.
>> I suspect it will be, so everything will be fine.
>> However if it isn't don't try to access the array.   Post the details and I'll
>> figure out what to do next.
>>
> 
> It doesn't work, [...]

forget to explain what i did: my idea was to create a new array with
--assume-clean, than kick out the knowed bad members:

minerva data-bck # mdadm --create /dev/md5 --assume-clean --metadata=1.1
--level=10 --raid-devices=4 /dev/sdb6 /dev/sda6 /dev/sdc6 /dev/sdd6
mdadm: /dev/sdb6 appears to be part of a raid array:
    level=raid10 devices=4 ctime=Thu Jul  8 09:47:43 2010
mdadm: /dev/sda6 appears to be part of a raid array:
    level=raid10 devices=4 ctime=Thu Jul  8 09:47:43 2010
mdadm: /dev/sdc6 appears to be part of a raid array:
    level=raid10 devices=4 ctime=Thu Jul  8 09:47:43 2010
mdadm: /dev/sdd6 appears to be part of a raid array:
    level=raid10 devices=4 ctime=Thu Jul  8 09:47:43 2010
Continue creating array? yes
mdadm: array /dev/md5 started.
minerva data-bck #
minerva data-bck # man mdadm
minerva data-bck # mdadm /dev/md5 --fail /dev/sda6 --fail /dev/sdc6
mdadm: set /dev/sda6 faulty in /dev/md5
mdadm: set /dev/sdc6 faulty in /dev/md5
minerva data-bck # cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5]
[raid4] [multipath] [faulty]
md5 : active raid10 sdd6[3] sdc6[2](F) sda6[1](F) sdb6[0]
      1434617856 blocks super 1.1 512K chunks 2 near-copies [4/2] [U__U]


this is exactly the same layout as i had before, just the data offset
doesn't match.

regards,
Csaba
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