Re: failed drive in raid 1 array

[Roberto Nunnari <roberto.nunnari@supsi.ch>]

Albert Pauw wrote:
>  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

ok.


>>> # 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

good to know! Thank you.


> 
>>> # 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.

Yes. They're normal mount point, so I'll have to
comment them out before rebooting, especially the swap partition.
Thank you for pointing that out!

Best regards.
Robi

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