Re: raid5: I lost a XFS file system due to a minor IDE cable problem

Justin Piszcz
2007-05-24T11:20:43Z

Including XFS mailing list on this one.

On Thu, 24 May 2007, Pallai Roland wrote:

>
> Hi,
>
> I wondering why the md raid5 does accept writes after 2 disks failed. I've an
> array built from 7 drives, filesystem is XFS. Yesterday, an IDE cable failed
> (my friend kicked it off from the box on the floor:) and 2 disks have been
> kicked but my download (yafc) not stopped, it tried and could write the file
> system for whole night!
> Now I changed the cable, tried to reassembly the array (mdadm -f --run),
> event counter increased from 4908158 up to 4929612 on the failed disks, but I
> cannot mount the file system and the 'xfs_repair -n' shows lot of errors
> there. This is expainable by the partially successed writes. Ext3 and JFS
> has "error=" mount option to switch filesystem read-only on any error, but
> XFS hasn't: why? It's a good question too, but I think the md layer could
> save dumb filesystems like XFS if denies writes after 2 disks are failed, and
> I cannot see a good reason why it's not behave this way.
>
> Do you have better idea how can I avoid such filesystem corruptions in the
> future? No, I don't want to use ext3 on this box. :)
>
>
> my mount error:
> XFS: Log inconsistent (didn't find previous header)
> XFS: failed to find log head
> XFS: log mount/recovery failed: error 5
> XFS: log mount failed
>
>
> --
> d
>
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