[gpfsug-discuss] How to shrink GPFS on DSSG's?

[Jonathan Buzzard]

On 20/06/2022 20:12, Jaime Pinto wrote:
> 
> Thanks JAB and Luis
> 
> I know, there are mmdelnsd, mmdeldisk, mmrestripefs and a few other 
> correlated mm* commands. They are very high-level in work in bulk 
> discreet fashion (I mean, considering the number of NSDs we have, each 
> deletion will shave 4% of the storage at once, that is too much).
> 

Then you are goosed. An NSD cannot be changed in size once created and 
can only ever be in a file system or out a file system. The only way to 
change the size of a GPFS file system is by adding or removing NSD's.

I am not a fan of how the DSS-G creates small numbers of huge NSD's. In 
fact the script sucks a *lot* from a systems admin perspective. Then 
again someone at IBM thought redeploying your entire OS every time you 
want to make a point release upgrade was a good idea.


JAB.

-- 
Jonathan A. Buzzard                         Tel: +44141-5483420
HPC System Administrator, ARCHIE-WeSt.
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG