[gpfsug-discuss] Upgrade with architecture change

[Marc A Kaplan]

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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