[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
Mit freundlichen Grüßen / Kind regards
Dr. Uwe Falke
IT Specialist
High Performance Computing Services / Integrated Technology Services /
Data Center Services
-------------------------------------------------------------------------------------------------------------------------------------------
IBM Deutschland
Rathausstr. 7
09111 Chemnitz
Phone: +49 371 6978 2165
Mobile: +49 175 575 2877
E-Mail: uwefalke at de.ibm.com
-------------------------------------------------------------------------------------------------------------------------------------------
IBM Deutschland Business & Technology Services GmbH / Geschäftsführung:
Frank Hammer, Thorsten Moehring
Sitz der Gesellschaft: Ehningen / Registergericht: Amtsgericht Stuttgart,
HRB 17122
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
_______________________________________________
gpfsug-discuss mailing list
gpfsug-discuss at spectrumscale.org
http://gpfsug.org/mailman/listinfo/gpfsug-discuss
_______________________________________________
gpfsug-discuss mailing list
gpfsug-discuss at spectrumscale.org
http://gpfsug.org/mailman/listinfo/gpfsug-discuss
More information about the gpfsug-discuss
mailing list