[Lustre-discuss] MDT backup procedure

[Cliff White]

Ramiro Alba Queipo wrote:
> HiDaniel,
> 
> By reading Chapter 15 of Lustre Operations Manual, it follows that an
> MDT backup is only useful if you are changing hardwary or the like.
> I am afraid that you can not pretend to replace with a previous image an
> failed MDT, as data in OSTs and MDT is not matching any more, right?

If you do a backup/immediate restore, it should be fine. If you restore 
from an old image you will lose the changes made post-backup, but the 
rest of the data should be fine.
cliffw

> 
> Cheers
> 
> On Wed, 2009-06-17 at 09:41 -0600, Daniel Kulinski wrote:
>> As we move forward with our lustre testing I am wondering about MDT
>> backup.  
>>
>>  
>>
>> Is it feasible to unmount the MDT, create an image of it and remount
>> it after the backup.  Of course this wouldn’t happen but nightly.
>>
>>  
>>
>> From what I can identify, in the case of an MDT failure we would have
>> to do the following:
>>
>>  
>>
>> Restore from the last backup.
>>
>> Run an lfsck across the filesystem.
>>
>>  
>>
>> Am I missing anything else at this point?  We will also be doing file
>> level backups of the filesystem as a whole but we are looking for
>> quick ways to recover from an MDT failure.
>>
>>  
>>
>> Thanks,
>>
>>   Dan Kulinski
>>
>>
>>
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