[Lustre-discuss] MDT backup procedure

Daniel Kulinski dank at weinmangeoscience.com
Wed Jun 17 10:51:39 PDT 2009


We are actually in an HA setup now.  My main concern is a double disk failure on the MDT device.  

Thanks,
  Dan Kulinski

-----Original Message-----
From: Hung-Sheng.Tsao at Sun.COM [mailto:Hung-Sheng.Tsao at Sun.COM] 
Sent: Wednesday, June 17, 2009 11:49 AM
To: Ramiro Alba Queipo
Cc: Daniel Kulinski; lustre-discuss at lists.lustre.org
Subject: Re: [Lustre-discuss] MDT backup procedure

IMHO, may be one can do a HA-MDS using shared storage all the datas are in the shared storage so U can do a failover


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?
>
> 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
>>
>>
>>
>> --
>> Aquest missatge ha estat analitzat per MailScanner a la cerca de 
>> virus i d'altres continguts perillosos, i es considera que está net.
>> MailScanner agraeix a transtec Computers pel seu suport. 
>> _______________________________________________
>> Lustre-discuss mailing list
>> Lustre-discuss at lists.lustre.org
>> http://lists.lustre.org/mailman/listinfo/lustre-discuss
>>     
>> ---------------------------------------------------------------------
>> ---
>>
>> _______________________________________________
>> Lustre-discuss mailing list
>> Lustre-discuss at lists.lustre.org
>> http://lists.lustre.org/mailman/listinfo/lustre-discuss
>>     




More information about the lustre-discuss mailing list