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Re: rebuilding raided root partition



Miles Fidelman wrote:

> Emanoil Kotsev wrote:
>> Miles Fidelman wrote:
>>
>> my root partition is raided, and is now running only on its single spare
>> drive:
>>
>> -----
>> server1:~# more /proc/mdstat
>> md2 : inactive sdd3[0] sdb3[2]
>>       195318016 blocks
>>   
>> You may try using the --run option.
>>
>> I do following
>>
>> 1) start the array with the healthy partition
>>         let's say md0 with sda1 sdb1
>>         and sdb1 is faulty
>>
>> mdadm -A /dev/md0 --add /dev/sda1 --run
>>   
> I get: device /dev/md2 already active - cannot assemble it
>> 2) add the faulty partition to the array for syncing
>>
>> mdadm /dev/md0 --add /dev/sdb1
>>
>> 3) check /proc/mdstat
>>
>> cat /proc/mdstat
>>
>> you can also stop the array at any time
>>
>> mdadm -S /dev/md0
>>
>>   
> well, I really can't  - since it's my root volume
> 
> 
I would boot with init=/bin/sh and do it from the initrd if you have mdadm
in it. At this point of time root is not mounted, so -S should work.

perhaps you can do it from a usb boot or live-cd

didn't understand it's your root, sorry

actually one could move root on the run as far as I know but I've never
tried it

regards


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