[gpfsug-discuss] File system recovery question

[Vic Cornell]

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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