Re: failed drive in raid 1 array

[Albert Pauw <albert.pauw@alice.nl>]

  On 02/23/11 06:56 PM, Roberto Spadim wrote:
> sata2 without hot plug?
> check if your sda sdb sdc will change after removing it, it´s depends
> on your udev or another /dev filesystem
>
> 2011/2/23 Roberto Nunnari<roberto.nunnari@supsi.ch>:
>> Hello.
>>
>> I have a linux box, with two 2TB sata HD in raid 1.
>>
>> Now, one disk is in failed state and it has no spares:
>> # cat /proc/mdstat
>> Personalities : [raid1]
>> md1 : active raid1 sdb4[2](F) sda4[0]
>>       1910200704 blocks [2/1] [U_]
>>
>> md0 : active raid1 sdb1[1] sda2[0]
>>       40957568 blocks [2/2] [UU]
>>
>> unused devices:<none>
>>
>>
>> The drives are not hot-plug, so I need to shutdown the box.
>>
>> My plan is to:
>> # sfdisk -d /dev/sdb>  sdb.sfdisk
>> # mdadm /dev/md1 -r /dev/sdb4
-> removing should be ok, as the partition has failed in md1
>> # mdadm /dev/md0 -r /dev/sdb1
-> In this case, sdb1 hasn't failed according to the output of 
/proc/mdstat, so you should fail it otherwise you can't remove it:
mdadm /dev/md0 -f /dev/sdb1
mdadm /dev/md0 -r /dev/sdb1

>> # shutdown -h now
>>
>> replace the disk and boot (it should come back up, even without one drive,
>> right?)
>>
>> # sfdisk /dev/sdb<  sdb.sfdisk
>> # mdadm /dev/md1 -a /dev/sdb4
>> # mdadm /dev/md0 -a /dev/sdb1
>>
>> and the drives should start to resync, right?
>>
>> This is my first time I do such a thing, so please, correct me
>> if the above is not correct, or is not a best practice for
>> my configuration.
>>
>> My last backup of md1 is of mid november, so I need to be
>> pretty sure I will not lose my data (over 1TB).
>>
>> A bit abount my environment:
>> # mdadm --version
>> mdadm - v1.12.0 - 14 June 2005
>> # cat /etc/redhat-release
>> CentOS release 4.8 (Final)
>> # uname -rms
>> Linux 2.6.9-89.31.1.ELsmp i686
What about sdb2 an sdb3, are they in use as normal mountpoints, or swap. 
Then these should be commented out in /etc/fstab
before you change the disk.
>> Thank you very much and best regards.
>> Robi
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>
>

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