[gpfsug-discuss] GPFS Upgrade 3.5 -> 4.1

[Yuri L Volobuev]

Correct.  mmchfs -V only done quick operations (that can be easily undone
if something goes wrong).  Essentially the big task here is to increase
on-disk file system descriptor version number, to allow using those
features that require a higher version.  Bigger "conversion"-style tasks
belong in mmmigratefs.

The only way to increase the inode size and the data block size is to
format a new file system.  This cannot be done on an existing file system.

yuri



From:	Jan-Frode Myklebust <janfrode at tanso.net>
To:	gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>,
Date:	10/10/2016 07:35 AM
Subject:	Re: [gpfsug-discuss] GPFS Upgrade 3.5 -> 4.1
Sent by:	gpfsug-discuss-bounces at spectrumscale.org



I've also always been worried about that one, but never experienced it
taking any time, I/O or interruption. I've the interpreted it to just start
using new features, but not really changing anything with the existing
metadata. Things needing on disk changes are probably put in mmmigratefs I
have not heard about anything needing mmmigratefs since GPFS v3.3 (fs
version 11.03) added fast extended attributes.

Would be great to hear otherwize, or confirmations.


-jf
man. 10. okt. 2016 kl. 14.32 skrev Peter Childs <p.childs at qmul.ac.uk>:
  We are finishing upgrading our GPFS cluster of around 250 (client) nodes
  from GPFS 3.5.0.31 to Spectrum Scale 4.1.1.8, and have just about
  upgraded all the computers.

  We are looking at running the "mmchfs -V LATEST" step and where wondering
  how much io this takes and if it was likely to interrupt service?

  We are looking at upgrading to 4.2 but plan to do that via Multi-cluster
  and AFM as we are integrating new hardware and wish to increase the block
  and inode size at the same time.

  Peter Childs
  Research Storage Expert
  ITS Research Infrastructure
  Queen Mary, University of London

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