[gpfsug-discuss] File system recovery question

[Jez Tucker]

So, er. Fun.

I checked our disks.

0000000 000000 000000 000000 000000 000000 000000 000000 000000
*
0001000 <some data from hereon>

Looks like you lost a fair bit.


Presumably you don't have replication of 2?
If so, I think you could just lose the NSD.

Failing that:

1) Check your other disks and see if there's anything that you can figure out.  Though TBH, this may take forever.
2) Restore
3) Call IBM and log a SEV 1.

3) then 2) is probably the best course of action

Jez



> -----Original Message-----
> From: gpfsug-discuss-bounces at gpfsug.org [mailto:gpfsug-discuss-
> bounces at gpfsug.org] On Behalf Of Chad Kerner
> Sent: 13 February 2013 16:29
> To: gpfsug-discuss at gpfsug.org
> Subject: [gpfsug-discuss] File system recovery question
> 
> 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
> 
> 
> _______________________________________________
> gpfsug-discuss mailing list
> gpfsug-discuss at gpfsug.org
> http://gpfsug.org/mailman/listinfo/gpfsug-discuss