[K12OSN] RAID1 failure: need help

[Timothy Legge]

BTW, when my issue occurred, I had had a power outage.  Did something 
similar happen there?

Tim

Timothy Legge wrote:
> Hi
> 
> Basically you need to add the drive/partitions back to each raid set.  I 
> had to do this a few weeks ago (thankfully bash history kept the commands):
> 
> First off ensure that you know which physical device goes with which 
> raid set (I spent a bunch of time going back and forth between the disk 
> layout in the hardware browser and the command line).  However, I see 
> now that the cat of /proc/mdstat shows that information.  I am not sure 
> whether it did for me or not.
> 
> When you are sure, you run commands like the following for each 
> partition and raid set to add in the missing partition:
> 
> mdadm --manage /dev/md1 --add /dev/sda2
> mdadm --manage /dev/md2 --add /dev/sda3
> mdadm --manage /dev/md3 --add /dev/sda4
> mdadm --manage /dev/md0 --add /dev/sda1
> 
> They are run one at a time if partitions in multiple raid sets share the 
> same physical device.  I did it on my home machine and saw no real issue 
> with performance but your results my vary.
> 
> The commands above look like they will work given the details you 
> provided but I take no responsibility for whatever happens if you assume 
> I know what I am talking about (or that I can type). ;-)
> 
> Regards and good luck
> 
> Tim
> 
> 
> Robert Arkiletian wrote:
> 
>> Wondering what I should do first. Any advice? Never been in this
>> situation before. System is still working fine on 1 drive. BTW
>> md0 is /
>> md1 is /home
>> md2 is /var
>> md3 is swap
>>
>> [ark at server ~]$ cat /proc/mdstat
>> Personalities : [raid1]
>> md1 : active raid1 sdb2[2](F) sda2[0]
>>      20482752 blocks [2/1] [U_]
>>
>> md2 : active raid1 sdb3[1] sda3[0]
>>      2048192 blocks [2/2] [UU]
>>
>> md3 : active raid1 sdb4[1] sda4[0]
>>      1020032 blocks [2/2] [UU]
>>
>> md0 : active raid1 sdb1[2](F) sda1[0]
>>      12289600 blocks [2/1] [U_]
>>
>> Here is where it puked in /var/log/messages
>>
>> Sep 30 08:48:03 server kernel: (scsi1:A:1): 160.000MB/s transfers
>> (80.000MHz DT, 16bit)
>> Sep 30 08:48:03 server kernel: SCSI error : <1 0 1 0> return code = 
>> 0x50000
>> Sep 30 08:48:03 server kernel: end_request: I/O error, dev sdb, sector 
>> 46199
>> Sep 30 08:48:03 server kernel: raid1: Disk failure on sdb1, disabling 
>> device.
>> Sep 30 08:48:03 server kernel:  Operation continuing on 1 devices
>> Sep 30 08:48:03 server kernel: SCSI error : <1 0 1 0> return code = 
>> 0x50000
>> Sep 30 08:48:03 server kernel: end_request: I/O error, dev sdb, sector 
>> 50548194
>> Sep 30 08:48:03 server kernel: raid1: Disk failure on sdb2, disabling 
>> device.
>> Sep 30 08:48:03 server kernel:  Operation continuing on 1 devices
>> Sep 30 08:48:03 server kernel: RAID1 conf printout:
>> Sep 30 08:48:03 server kernel:  --- wd:1 rd:2
>> Sep 30 08:48:03 server kernel:  disk 0, wo:0, o:1, dev:sda2
>> Sep 30 08:48:03 server kernel:  disk 1, wo:1, o:0, dev:sdb2
>> Sep 30 08:48:03 server kernel: RAID1 conf printout:
>> Sep 30 08:48:03 server kernel:  --- wd:1 rd:2
>> Sep 30 08:48:03 server kernel:  disk 0, wo:0, o:1, dev:sda2
>> Sep 30 08:48:03 server kernel: RAID1 conf printout:
>> Sep 30 08:48:03 server kernel:  --- wd:1 rd:2
>> Sep 30 08:48:03 server kernel:  disk 0, wo:0, o:1, dev:sda1
>> Sep 30 08:48:03 server kernel:  disk 1, wo:1, o:0, dev:sdb1
>> Sep 30 08:48:03 server kernel: RAID1 conf printout:
>> Sep 30 08:48:03 server kernel:  --- wd:1 rd:2
>> Sep 30 08:48:03 server kernel:  disk 0, wo:0, o:1, dev:sda1
>>
>>
>>
>> -- 
>> Robert Arkiletian
>> C++ GUI tutorial http://fltk.org/links.php?V19
>>
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> 
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