Kurt, The phrasing is a little confusing. The idea is that you can do a rolling upgrade, but it is important to complete the upgrade and not continue running with servers at different versions. Version gaps between servers is OK in the context of a rolling upgrade but not otherwise. That case you are describing - deliberately leaving different versions on different servers - is specifically what you're not​ supposed to do, because server version interop isn't tested outside the context of a rolling upgrade.
Regards, Patrick ________________________________ From: lustre-discuss <[email protected]> on behalf of Kurt Strosahl via lustre-discuss <[email protected]> Sent: Monday, February 21, 2022 2:31 PM To: [email protected] <[email protected]> Subject: [lustre-discuss] Upgrading lustre servers Good afternoon, I have a question about upgrading lustre servers... The lustre manual says the following: "Lustre software release 2.x.y release (minor) upgrade: All servers must be upgraded at the same time, while some or all clients may be upgraded. Rolling upgrades are supported for minor releases allowing individual servers and clients to be upgraded without stopping the Lustre file system." which seems contradictory. Could I update one oss in a lustre file system from (say) 2.12.1 to 2.12.8, and leave the rest of the file system alone? w/r, Kurt J. Strosahl (he/him) System Administrator: Lustre, HPC Scientific Computing Group, Thomas Jefferson National Accelerator Facility
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