[gpfsug-discuss] File system recovery question
Chad Kerner
ckerner at ncsa.uiuc.edu
Wed Feb 13 16:52:30 GMT 2013
(! 41)-> mmfsadm test readdescraw /dev/mapper/dh1_vd05_005
No NSD descriptor in sector 2 of /dev/mapper/dh1_vd05_005
No Disk descriptor in sector 1 of /dev/mapper/dh1_vd05_005
No FS descriptor in sector 8 of /dev/mapper/dh1_vd05_005
On Wed, Feb 13, 2013 at 04:48:55PM +0000, Vic Cornell wrote:
> So what do you get if you run:
>
> mmfsadm test readdescraw /dev/mapper/dh1_vd05_005
>
> ?
>
>
>
>
> Vic Cornell
> viccornell at gmail.com
>
>
> On 13 Feb 2013, at 16:29, Chad Kerner <ckerner at ncsa.uiuc.edu> wrote:
>
>
> I have a file system, and it appears that someone dd'd over the first part
> of one of the NSD's with zero's. I see the device in multipath. I can
> fdisk and dd the device out.
>
> Executing od shows it is zero's.
> (! 21)-> od /dev/mapper/dh1_vd05_005 | head -n 5
> 0000000 000000 000000 000000 000000 000000 000000 000000 000000
> *
> 0040000 120070 156006 120070 156006 120070 156006 120070 156006
>
> Dumping the header of one of the other disks shows read data for the other
> NSD's in that file system.
>
> (! 25)-> mmlsnsd -m | grep dh1_vd05_005
> Disk name NSD volume ID Device Node name
> Remarks
> ---------------------------------------------------------------------------------------
> dh1_vd05_005 8D8EEA98506C69CE - myhost (not found) server
> node
>
> (! 27)-> mmnsddiscover -d dh1_vd05_005
> mmnsddiscover: Attempting to rediscover the disks. This may take a while
> ...
> myhost: Rediscovery failed for dh1_vd05_005.
> mmnsddiscover: Finished.
>
>
> Wed Feb 13 09:14:03.694 2013: Command: mount desarchive
> Wed Feb 13 09:14:07.101 2013: Disk failure. Volume desarchive. rc = 19.
> Physical volume dh1_vd05_005.
> Wed Feb 13 09:14:07.102 2013: File System desarchive unmounted by the
> system with return code 5 reason code 0
> Wed Feb 13 09:14:07.103 2013: Input/output error
> Wed Feb 13 09:14:07.102 2013: Failed to open desarchive.
> Wed Feb 13 09:14:07.103 2013: Input/output error
> Wed Feb 13 09:14:07.102 2013: Command: err 666: mount desarchive
> Wed Feb 13 09:14:07.104 2013: Input/output error
> Wed Feb 13 09:14:07 CST 2013: mmcommon preunmount invoked. File system:
> desarchive Reason: SGPanic
>
> Is there any way to repair the header on the NSD?
>
> Thanks for any ideas!
> Chad
>
>
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