The only requirement for upgrade ordering in the past was during the 1.8->2.x upgrade. In that case, 1.8 clients could connect to both 1.8 and 2.x servers, while 2.x clients can only connect to 2.x servers. Since then there isn't a hard requirement for upgrade ordering, though we only test a few combinations of versions together.
Cheers, Andreas -- Andreas Dilger Lustre Principal Architect Intel High Performance Data Division On 2016/06/22, 13:28, "lustre-discuss on behalf of Alexander I Kulyavtsev" <lustre-discuss-boun...@lists.lustre.org<mailto:lustre-discuss-boun...@lists.lustre.org> on behalf of a...@fnal.gov<mailto:a...@fnal.gov>> wrote: Servers upgraded first or with clients. Alex. On Jun 22, 2016, at 11:01 AM, E.S. Rosenberg <esr+lus...@mail.hebrew.edu<mailto:esr+lus...@mail.hebrew.edu>> wrote: I always understood the recommendation was to update the clients (and LNET Routers) before the servers and not the other way around?
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