[CentOS] Re: Rebuilding Raid 1
Mace Eliason
meliason at shaw.ca
Tue May 2 05:21:24 UTC 2006
Also I ran fdisk -l and this is what I got
/dev/sda1
/dev/sda2
/dev/sda3
/dev/sdb1
/dev/sdb2
/dev/sdb3
disk /dev/md0: 106meg
/dev/md0 doesn't contain a valid partion table
disk /dev/md2: 15.9gig
/dev/md2 doesn't contain a valid partion table
disk /dev/md1: 2097meg
/dev/md1 doesn't contain a valid partion table
Does that help at all?
Mace Eliason wrote:
> I think the reason for the partitions not being on the same drive is
> because the old drive is the bootable drive and I changed the scsi ids
> of the drives to get it to work. I think it is using sba for the
> boot but centos is on sbb.
> I just need to make sure that the sync happens so that the info on sbb
> is what is synced. The info on sba is 1 month old this I have
> confirmed by mounting sba3 and looking at the dates of the last emails
> received on the server I couldn't mount sdb3 because it is the active
> partition.
>
> So from what your saying below running mdadm as you have shown will it
> copy the good info on sdb to sda?
>
> I have to have this server ready for 7am or we will loose this
> contract. I can't believe I have spend all day on this.
>
> Thanks for the help
>
> If I copy over the wrong info they will lose 1 months worth of emails.
>
> Mace
>
>
> Les Mikesell wrote:
>> On Mon, 2006-05-01 at 23:18, Mace Eliason wrote:
>>
>>> Personalities : [raid1]
>>> md1 : active raid1 sdb2[0]
>>> 2048192 blocks [2/1] [U_]
>>> md2: active raid1 sdb3[0]
>>> 15623104 blocks [2/1] [U_]
>>> md0: active raid1 sda1[1]
>>> 104320 blocks [2/1] [_U]
>>>
>>
>> That tells you that your raid devices were built with
>> 2 partitions and now only have one active. It shows
>> which member is active - note that they aren't all
>> on the same drive. Assuming you have matching
>> partitions on the other drive (do an 'fdisk -l' to
>> make sure) and are sure the correct version is
>> running now:
>>
>> mdadm --add /dev/md0 /dev/sdb1
>> mdadm --add /dev/md1 /dev/sda2
>> mdadm --add /dev/md2 /dev/sda3
>>
>> 'cat /proc/mdstat' will show the re-sync progress. Don't
>> reboot until the resync is complete and you see [UU] on
>> all devices. When they have all completed, if you
>> reboot cleanly the md devices will come up with both
>> partitions active (but you don't have to reboot unless
>> you want to test it).
>>
>>
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