[lustre-discuss] Lustre 2.10.4 server with 2.5.32 clients

[Andreas Dilger]

Lustre has a fairly robust network protocol negotiation at mount time
between the client and server, and we try hard to avoid any protocol
changes that are not covered by the connect-time negotiation. However,
we aren't able to test all possible combinations of versions, so the
published list is what we have tested. It is entirely possible that older
client versions will work with newer server version, and vice versa.

Cheers, Andreas

On Jul 3, 2018, at 10:57, Mark Miller <mmill116 at jhu.edu<mailto:mmill116 at jhu.edu>> wrote:

Hi All,

A while back, someone asked the list about using Lustre 2.10.4 clients to access a Lustre 2.5.3 server, and the consensus was that it worked without issue.  We have the opposite scenario where we have RHEL6.9 compute nodes running version 2.5.32 of the Lustre client, and we are standing up a new Lustre server running version 2.10.4.  It seems to work with the testing I’ve done, but I wanted to see if anyone has run across any issues with running older Lustre clients against newer Lustre servers (and also see if anyone has run that combo successfully).

Part of the concern comes from http://wiki.lustre.org/Lustre_2.10.4_Changelog which says lists “Interoperability Support” as “Clients & Servers: Latest 2.9.X”

We are planning on upgrading the Lustre clients on the compute nodes during the next patching cycle, but upgrading now would require quiescing the nodes to unmount the lustre filesystems and unload the lustre module.

Thanks for any insights!!
Mark
--
Mark Miller – JHPCE Cluster Technology Manager
Johns Hopkins Bloomberg School of Public Health
Office E2530, 615 N. Wolfe St., Baltimore, MD, 21205
443-287-2774 |  https://jhpce.jhu.edu/
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