[lustre-discuss] client complains about server version

[Patrick Farrell]

Riccardo,

You may be unable to free space on the OSTs when deleting files.  I can't remember if 2.4 has the required support for delete-from-MDS (not the real feature name, sorry).  I think it does, but I'm not sure.  It's easy to check - just delete a large file and see if the space shows up as free.

Other than that, your main concern is that no one has tested this or fixed any bugs that came up. I'm not aware of anything that should be broken, again except possibly for that thing with delete I mentioned, and obviously, lots of client features will not work. But they should be disabled automatically because the server doesn't support them.

So you might be OK, but there's a very real chance those clients may crash the servers or the other way around, as the combination is not supported and has not been tested.

I strongly suggest you upgrade your servers!  There are lots of handy new features, and you would avoid this problem entirely.

- Patrick
________________________________
From: lustre-discuss <lustre-discuss-bounces at lists.lustre.org> on behalf of Riccardo Veraldi <Riccardo.Veraldi at cnaf.infn.it>
Sent: Saturday, May 6, 2017 5:25:40 PM
To: lustre-discuss at lists.lustre.org
Subject: [lustre-discuss] client complains about server version

Hello,

I moved many of my lustre clients to 2.9.0. Anyway the server version is
pretty old (2.4)

Do I have to worry ?

Things seems working though

May  4 14:37:48 psana1620 kernel: [   43.145108] Lustre: Server MGS
version (2.4.1.0) is much older than client. Consider upgrading server
(2.9.0)


thank you

Ricl


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