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

[Damir Krstic]

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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>
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