[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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