[Gluster-users] Quick question regarding xfs_repair

[Mohit Anchlia]

What RAID level is this? Would RAID 10 or RAID 6 help in such scenarios?

On Mon, Mar 14, 2011 at 9:56 AM, Joe Landman
<landman at scalableinformatics.com> wrote:
> On 03/14/2011 12:50 PM, Terry Haley wrote:
>>
>> Hello,
>
> [...]
>
>> My question has two parts.
>>
>>
>>
>> 1.       If I perform an xfs_repair will gluster become out of sync with
>> the
>> filesystem in lieu of repairs?
>
> If the xfs_repair modifies the extended attributes, it is possible that the
> gluster file system will appear to be inconsistent.  Same issue would be
> with ext* and fsck.  Gluster team would need to respond to this.
>
>> 2.       Can I trust the backups I performed after these issues cropped up
>> as a result of the distribution of files across the nodes? Ie, a file is
>> only ¾ complete or would gluster complain and make that file unavailable
>> as
>> it should?
>
> Good question.  Can you verify that the data stored on the corrupted RAID
> hasn't been replicated to the other nodes?  If so, easiest route might be a
> RAID rebuild, and then a file system wipe on the effected node, followed by
> a resync (assuming you are doing a replicated design).
>
> If the bad data's been replicated, then you probably have to trash that data
> (and do something similar to the above anyway).
>
> Does your RAID kit have a scan/check function?  We do this with our units
> (both hardware/software RAID), and schedule full scans at least weekly.
>  Strongly advise something similar if you aren't doing it already.
>
> Regards,
>
> Joe
>
> --
> Joseph Landman, Ph.D
> Founder and CEO
> Scalable Informatics Inc.
> email: landman at scalableinformatics.com
> web  : http://scalableinformatics.com
>       http://scalableinformatics.com/sicluster
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