[gpfsug-discuss] Server lost NSD mappings

[Jared David Baker]

Thanks for all the information. I’m not exactly sure what happened during the firmware update of the HCAs (another admin). But I do have all the stanza files that I used to create the NSDs. Possible to utilize them to just regenerate the NSDs or is it consensus that the FS is gone? As the system was not in production (yet) I’ve got no problem delaying the release and running some tests to verify possible fixes. The system was already unmounted, so it is a completely inactive FS across the cluster.

Thanks,

Jared

From: gpfsug-discuss-bounces at gpfsug.org [mailto:gpfsug-discuss-bounces at gpfsug.org] On Behalf Of Sven Oehme
Sent: Wednesday, October 29, 2014 11:23 AM
To: gpfsug main discussion list
Subject: Re: [gpfsug-discuss] Server lost NSD mappings

if you still have a running system you can extract the information and recreate the descriptors.
if your sytem is already down, this is not possible any more.

which is why i suggested to open a PMR as the Support team will be able to provide the right guidance and help .

Sven

On Wed, Oct 29, 2014 at 10:19 AM, Jonathan Buzzard <jonathan at buzzard.me.uk<mailto:jonathan at buzzard.me.uk>> wrote:
On Wed, 2014-10-29 at 09:42 -0700, Sven Oehme wrote:
> Hello,
>
>
> there are multiple reasons why the descriptors can not be found .
>
>
> there was a recent change in firmware behaviors on multiple servers
> that restore the GPT table from a disk if the disk was used as a OS
> disk before used as GPFS disks.  some infos
> here : https://www.ibm.com/developerworks/community/forums/html/topic?id=27f98aab-aa41-41f4-b6b7-c87d3ce87b9e
>
>
> if thats the case there is a procedure to restore them.

I have been categorically told by IBM in no uncertain terms if the NSD
descriptors have *ALL* been wiped then it is game over for that file
system; restore from backup is your only option.

If the GPT table has been "restored" and overwritten the NSD descriptors
then you are hosed.

JAB.

--
Jonathan A. Buzzard                 Email: jonathan (at) buzzard.me.uk<http://buzzard.me.uk>
Fife, United Kingdom.

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