I don't know the particulars of the case in question, nor much about ESS rules... But for a vanilla Spectrum Scale cluster -.
1) There is nothing wrong or ill-advised about upgrading software and then creating a new version 5.x file system... keeping any older file systems in place. 2) I thought AFM was improved years ago to support GPFS native access -- need not go through NFS stack...? Whereas your wrote: ... nor is it advisable to try to create a new pool or filesystem in same cluster and then migrate (partially because migrating between filesystems within a cluster with afm would require going through nfs stack afaik) ...
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