[lustre-discuss] client complains about server version

[Riccardo Veraldi]

thanks for the hints.
Is Lustre 2.8.0 client vs server 2.4.1 untested as well ?

On 5/6/17 7:36 PM, Patrick Farrell wrote:
>
> 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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