[gpfsug-discuss] cross-cluster mounting different versions of gpfs

[Sanchez, Paul]

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<mailto:gpfsug-discuss-bounces at spectrumscale.org>> on behalf of Damir Krstic <damir.krstic at gmail.com<mailto:damir.krstic at gmail.com>>
Reply-To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org<mailto:gpfsug-discuss at spectrumscale.org>>
Date: Tuesday, March 15, 2016 at 3:31 PM
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org<mailto: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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