Lustre discuss - Aug 2010 - Version mismatch of Lustre client and server

Hello,

I am planning on deploying a few more clients in my lustre environment and
was wondering which client version to install.  I know it is okay to run a
newer client version than your lustre server for upgrade purposes.  However,
would it be okay to be in this state for a longer period of time (for the
life of this filesystem)?  My lustre server is currently running 1.8.1.1 on
RHEL 5.3 and I am planning on deploying 1.8.2 on SLES 11.  Also, I am trying
to stay as close as possible to 1.8.1.1 which is why I am planning on
installing the 1.8.2 version of lustre client.  Are they many changes
between 1.8.2 and 1.8.4.

Thanks,
-J
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On 2010-08-11, at 15:00, Jagga Soorma wrote:
> I am planning on deploying a few more clients in my lustre environment and
was wondering which client version to install.  I know it is okay to run a newer
client version than your lustre server for upgrade purposes.  However, would it
be okay to be in this state for a longer period of time (for the life of this
filesystem)?
We run one of our internal test systems like this always, to catch version
interoperability bugs.
> My lustre server is currently running 1.8.1.1 on RHEL 5.3 and I am planning
on deploying 1.8.2 on SLES 11.  Also, I am trying to stay as close as possible
to 1.8.1.1
Why, if I might ask?
> which is why I am planning on installing the 1.8.2 version of lustre
client.
>  Are they many changes between 1.8.2 and 1.8.4.
1.8.x is only getting bug fixes at this point.  As with any release, you can see
the list of changes in 1.8.4 in the {lustre,lnet,ldiskfs}/ChangeLog files.  That
said, 1.8.4 does have a fair number of bug fixes brought in from Cray and LLNL,
so I would recommend everyone to use it (when it finally appears on the download
site).

Cheers, Andreas
--
Andreas Dilger
Lustre Technical Lead
Oracle Corporation Canada Inc.

>
> > My lustre server is currently running 1.8.1.1 on RHEL 5.3 and I am
> planning on deploying 1.8.2 on SLES 11.  Also, I am trying to stay as close
> as possible to 1.8.1.1
>
> Why, if I might ask?
>
To introduce the least amount of changes in this environment.  The only
reason I have updating the kernel for these new servers is since we have
been unable to solve the non lustre specific NFS timeouts on the compute
nodes which seems to be related to some bugs in rpc that might be fixed with
the new release.

You don''t see any issues with me jumping directly to 1.8.4?  I just
though
it would make sense to jump to 1.8.2 so that there are not too many changes
introduced in my environment which has been stable so far with the exception
of this nfs stuff.

Thanks,
-Simran

>
> > which is why I am planning on installing the 1.8.2 version of lustre
> client.
> >  Are they many changes between 1.8.2 and 1.8.4.
>
> 1.8.x is only getting bug fixes at this point.  As with any release, you
> can see the list of changes in 1.8.4 in the {lustre,lnet,ldiskfs}/ChangeLog
> files.  That said, 1.8.4 does have a fair number of bug fixes brought in
> from Cray and LLNL, so I would recommend everyone to use it (when it
finally
> appears on the download site).
>
> Cheers, Andreas
> --
> Andreas Dilger
> Lustre Technical Lead
> Oracle Corporation Canada Inc.
>
>
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tbh, 1.8.1.1 => 1.8.2 introduces above average change because the delta 
between 1.8.1 and 1.8.1.1 was so small. 1.8.2 => 1.8.3 and 1.8.3 => 
1.8.4 introduces limited relatively change My advice would be to use the 
latest available release in order to gain the benefit of feedback from 
previous upgraders.

Jagga Soorma wrote:
>
>     > My lustre server is currently running 1.8.1.1 on RHEL 5.3 and I
>     am planning on deploying 1.8.2 on SLES 11.  Also, I am trying to
>     stay as close as possible to 1.8.1.1
>
>     Why, if I might ask?
>
>
> To introduce the least amount of changes in this environment.  The 
> only reason I have updating the kernel for these new servers is since 
> we have been unable to solve the non lustre specific NFS timeouts on 
> the compute nodes which seems to be related to some bugs in rpc that 
> might be fixed with the new release.
>
> You don''t see any issues with me jumping directly to 1.8.4?  I
just
> though it would make sense to jump to 1.8.2 so that there are not too 
> many changes introduced in my environment which has been stable so far 
> with the exception of this nfs stuff.
>
> Thanks,
> -Simran
>  
>
>
>     > which is why I am planning on installing the 1.8.2 version of
>     lustre client.
>     >  Are they many changes between 1.8.2 and 1.8.4.
>
>     1.8.x is only getting bug fixes at this point.  As with any
>     release, you can see the list of changes in 1.8.4 in the
>     {lustre,lnet,ldiskfs}/ChangeLog files.  That said, 1.8.4 does have
>     a fair number of bug fixes brought in from Cray and LLNL, so I
>     would recommend everyone to use it (when it finally appears on the
>     download site).
>
>     Cheers, Andreas
>     --
>     Andreas Dilger
>     Lustre Technical Lead
>     Oracle Corporation Canada Inc.
>
>
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