[Lustre-discuss] Interoperability beween lustre 1.4.11client and lustre 1.6.server

[Herb Wartens]

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Andreas,
Actually we have a patch here at the lab that augments lctl to copy logs.
We can do this on a running filesystem.  If the administrator uses this
command, it is possible to have a freshly formatted 1.6 Lustre filesystem
that can mount 1.4.x clients.  This seems to work just fine on our test
systems.  There are some log records that 1.4 clients do not understand, but there
seem to just be harmless markers.  We also plan on using this if we ever add any new
osts to the filesystems that we upgraded from 1.4 to 1.6...
I will open a bug and post the patch over there if people might find it useful.

- -Herb

Andreas Dilger wrote:
> On Apr 24, 2008  17:08 +0000, Quigley, Tom wrote:
>>>> On Apr 23, 2008  21:58 +0530, ashok bharat bayana wrote:
>>>> Is there an interoperability between lustre 1.4.11 client and lustre
>>>> 1.6 server? i mean can we make lustre 1.4.11 client talk to lustre 1.6
>>>> server?
>>> Only if the filesystem was originally formatted with 1.4 and upgraded
>>> to 1.6 later.
>> does the interoperability work in the opposite direction, i.e. with a
>> 1.4.11 server and a 1.6 client?
> 
> Yes, this works fine.  To be clear, it IS possible to have 1.4.11 clients
> on 1.6 servers, but only in the case where the filesystem was previously
> upgraded from 1.4.
> 
> Cheers, Andreas
> --
> Andreas Dilger
> Sr. Staff Engineer, Lustre Group
> Sun Microsystems of Canada, Inc.
> 
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> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss
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