On 20/06/2022 19:04, Jaime Pinto wrote:
I'm wondering if it's possible to shrink GPFS gracefully.
Yes absolutely, been possible since at least version 2.2 and probably older.
I've seen some
references to that effect on some presentations, however I can't find
detailed instructions on any formal IBM documentation on how to do it.
Use mmdeldisk to remove the NSD(s) from a file system. This will take a
while so I recommend in the *STRONGEST* possible terms running it in a
screen or tmux session. By a while it could be days or even weeks
depending on how much data needs to be moved about.
Once you have removed the NSD's from a file system then you can use
mmdelnsd to wipe the NSD descriptors from the disks if necessary.
About 3 years ago we launched a new GPFS deployment with 3 DSS-G
enclosures (9.6PB usable).
Some 1.5 years later we added 2 more enclosures, for a total of 16PB,
and only 7PB occupancy so far.
Basically I'd like to return to the original 3 enclosures, and still
maintain the (8+2p) parity level.
Any suggestions?
Not being sarky but really use Google. Say "gpfs remove nsd from file
system" and select the first link!
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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