[gpfsug-discuss] Upgrade with architecture change
Marc A Kaplan
makaplan at us.ibm.com
Thu Jun 8 17:01:07 BST 2017
If you proceed carefully, it should not be necessary to mmdeldisk and
mmadddisks. Although we may not have tested your exact scenario, GPFS
does support fiber channel disks attached to multiple nodes. So the same
disk can be attached to multiple GPFS nodes - and those nodes can be
running different OSes and different GPFS versions.
(That's something we do actually test!)
Since GPFS can handle that with several nodes simultaneously active -- it
can also handle the case when nodes come and go... Or in your case are
killed and then reborn with new software...
The key is to be careful... You want to unmount the file system and not
re-mount until all of the disks become available again via one or more
(NSD) nodes.
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