[gpfsug-discuss] Lost disks
Jonathan Buzzard
jonathan.buzzard at strath.ac.uk
Thu Jul 27 16:09:31 BST 2017
On Thu, 2017-07-27 at 16:18 +0200, Uwe Falke wrote:
> "Just doing something" makes things worse usually. Whether a 3rd
> party tool knows how to handle GPFS NSDs can be doubted (as long as it
> is not dedicated to that purpose).
It might usually, but IBM have *ALREADY* given up in this case and told
the customer their data is toast. Under these circumstances other than
wasting time that could have been spent profitably on a restore it is
*IMPOSSIBLE* to make the situation worse.
[SNIP]
> It seems not a bad idea to set aside the NSD headers of your NSDs in a
> back up :-)
> And also now: Before amending any blocks on your disks, save them!
>
It's called NSD v2 descriptor format, so rather than use raw disks they
are in a GPT partition, and for good measure a backup copy is stored at
the end of the disk too.
Personally if I had any v1 NSD's in a file system I would have a plan
for a series of mmdeldisk/mmcrnsd/mmadddisk to get them all to v2 sooner
rather than later.
JAB.
--
Jonathan A. Buzzard Tel: +44141-5483420
HPC System Administrator, ARCHIE-WeSt.
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG
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