[gpfsug-discuss] cross-cluster mounting different versions ofgpfs

Uwe Falke UWEFALKE at de.ibm.com
Wed Mar 16 13:29:42 GMT 2016


Hi, Damir, 
you cannot mount a 4.x fs level from a 3.5 level cluster / node. You need 
to create the fs with a sufficiently low level, fs level downgrade is not 
possible, AFAIK.
3.5 nodes can mount fs from 4.1 cluster (fs at 3.5.0.7 fs level), that I 
can confirm for sure.

Uwe

 
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From:   Damir Krstic <damir.krstic at gmail.com>
To:     gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:   03/16/2016 02:09 PM
Subject:        Re: [gpfsug-discuss] cross-cluster mounting different 
versions of     gpfs
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



Thanks for all replies. Do all of the same restrictions apply to 4.1? We 
have an option of installing ESS with 4.1. If we install ESS with 4.1 can 
we then cross mount to 3.5 with FS version of 4.1? Also with 4.1 are there 
any issues with key exchange?

Thanks,
Damir

On Tue, Mar 15, 2016 at 10:29 PM Sanchez, Paul <Paul.Sanchez at deshaw.com> 
wrote:
You do have to keep an eye out for filesystem version issues as you set 
this up.  If the new filesystem is created with a version higher than the 
3.5 cluster?s version, then the 3.5 cluster will not be able to mount it. 
  
 
You can specify the version of a new filesystem at creation time with, for 
example, ?mmcrfs ?version 3.5.<x.x>?.  
You can confirm an existing filesystem?s version with ?mmlsfs <filesystem> 
| grep version?.  
 
There are probably a pile of caveats about features that you can never get 
on the new filesystem though.  If you don?t need high-bandwidth, parallel 
access to the new filesystem from the 3.5 cluster, you could use CES or 
CNFS for a time, until the 3.5 cluster is upgraded or retired.
 
A possibly better recommendation would be to upgrade the 3.5 cluster to at 
least 4.1, if not 4.2, instead.  It would continue to be able to serve any 
of your old version filesystems, but not prohibit you from moving forward 
on the new ones.
 
-Paul
 
From: gpfsug-discuss-bounces at spectrumscale.org [mailto:
gpfsug-discuss-bounces at spectrumscale.org] On Behalf Of Oesterlin, Robert
Sent: Tuesday, March 15, 2016 4:45 PM

To: gpfsug main discussion list
Subject: Re: [gpfsug-discuss] cross-cluster mounting different versions of 
gpfs
 
I?ve never used ESS, but I state for a fact you can cross mount clusters 
at various levels without a problem ? I do it all the time during 
upgrades. I?m not aware of any co-exisitance problems with the 3.5 and 
above. Yo may be limited on 4.2 features when accessing it via the 3.5 
cluster, but data access should work fine.
 
Bob Oesterlin
Sr Storage Engineer, Nuance HPC Grid
507-269-0413
 
 
From: <gpfsug-discuss-bounces at spectrumscale.org> on behalf of Damir Krstic 
<damir.krstic at gmail.com>
Reply-To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date: Tuesday, March 15, 2016 at 3:31 PM
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Subject: [gpfsug-discuss] cross-cluster mounting different versions of 
gpfs
 
We are deploying ESS with Spectrum Scale 4.2. Our compute cluster is 
running GPFS 3.5. We will remote cluster mount ESS to our compute cluster. 
When looking at GPFS coexistance documents, it is not clear whether GPFS 
3.5 cluster can remote mount GPFS 4.2. Does anyone know if there are any 
issues in remote mounting GPFS 4.2 cluster on 3.5 cluster? 
 
Thanks,
Damir
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