[mythtv-users] Reassemble RAID with mdadm

[Phillip Barnett]

Thanks George - mmm, I feel pretty stupid now, as I appear to have  
fixed it without realising (drunken late-night tinkering, or helpful  
tech-savvy fairies?)
Anyway, /proc/mdstat says

$ cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5]  
[raid4] [raid10]
md0 : active raid1 sdb1[0] sdc1[1]
       976759936 blocks [2/2] [UU]

which to me means it's fixed, and it has auto-assembled post-reboot,  
so I just need to mount the device. Hurrah!

Thanks again, sorry for bothering you...

Phillip


On 16 Mar 2010, at 12:32, George Mari wrote:

> On 03/16/2010 05:02 AM, Phillip Barnett wrote:
>> I have three disks, sda, sdb, sdc. The OS is on sda, and sdb and sdc
>> were RAIDed as RAID1, with all my media.
>>
>> Recently my myth installation got totally screwed up, and I decided  
>> to
>> do a complete upgrade/reinstall. However, this has now broken the  
>> array
>> as all the config material was on the sda drive (d'oh!), and I need  
>> to
>> know how to reassemble the disks. Using mdadm --create didn't work,  
>> as
>> it warned me that the disks were already used for an array. Should  
>> I use
>> assemble, create or build in this instance? The disks themselves are
>> intact and can be mounted and read individually, but I do need to
>> reassemble them into a RAID without losing the media already on them.
>>
>
> What is the output of cat /proc/mdstat?
>
> If your sdb and sdc drives are listed in there as part of an array,  
> all you would have to do is mount the array to the mountpoint you  
> desire.
>
> If they aren't part of an array, you should just be able to use the  
> mdadm --assemble command to asseble the two drives into an array.
>
> However, if they are not auto-assembling after a reboot, then most  
> likely this assembly will only work temprorarily.  You may need to  
> look into your /etc/mdadm.conf file to see how the arrary was  
> identified previously, and figure out why it's no longer being  
> identified.  I've had the UUID of the array change as part of a  
> system upgrade before, which was annoying, but fixable.
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