[gpfsug-discuss] Multi-cluster question (was Re: gpfsug-discuss Digest, Vol 100, Issue 32)

[Stephen Ulmer]

I have a question about multi-cluster, but it is related to this thread (it would be solving the same problem).

Let’s say we have two clusters A and B, both clusters are normally shared-everything with no NSD servers defined. We want cluster B to be able to use a file system in cluster A.  If I zone the SAN such that cluster B can see all of cluster A’s disks, can I then define a multi-cluster relationship between them and mount a file system from A on B?

To state it another way, must B's I/O for the foreign file system pass though NSD servers in A, or can B’s nodes discover that they have FibreChannel paths to those disks and use them?

I know that the nodes in B become sort-of “casual" members of A, but I don’t know *how* casual the relationship is...

Liberty,

-- 
Stephen



> On May 29, 2020, at 11:02 AM, Prasad Surampudi <prasad.surampudi at theatsgroup.com> wrote:
> 
> Jim,
> The minimum release for 5.0.4 cluster is 5.0.4.3. 
> 
> We are aware that we can't merge both gpfs_4 and gpfs_5 filesystems. Our plan is to import the gpfs_4 filesystem into the Spectrum Scale 5.0 cluster (with its NSDs mapped to Spectrum Scale 5.0 clusters nodes) and copy the data using rsync, across  fibre channel instead of ethernet to get higher bandwidth.
> 
> 
> On 5/29/20, 8:27 AM, "gpfsug-discuss-bounces at spectrumscale.org on behalf of gpfsug-discuss-request at spectrumscale.org" <gpfsug-discuss-bounces at spectrumscale.org on behalf of gpfsug-discuss-request at spectrumscale.org> wrote:
> 
>    Send gpfsug-discuss mailing list submissions to
>    	gpfsug-discuss at spectrumscale.org
> 
>    To subscribe or unsubscribe via the World Wide Web, visit
>    	http://gpfsug.org/mailman/listinfo/gpfsug-discuss
>    or, via email, send a message with subject or body 'help' to
>    	gpfsug-discuss-request at spectrumscale.org
> 
>    You can reach the person managing the list at
>    	gpfsug-discuss-owner at spectrumscale.org
> 
>    When replying, please edit your Subject line so it is more specific
>    than "Re: Contents of gpfsug-discuss digest..."
> 
> 
>    Today's Topics:
> 
>       1. Re: Importing a Spectrum Scale a filesystem from 4.2.3
>          cluster to 5.0.4.3 cluster (Carl Zetie - carlz at us.ibm.com)
> 
> 
>    ----------------------------------------------------------------------
> 
>    Message: 1
>    Date: Fri, 29 May 2020 12:25:46 +0000
>    From: "Carl Zetie - carlz at us.ibm.com" <carlz at us.ibm.com>
>    To: "gpfsug-discuss at spectrumscale.org"
>    	<gpfsug-discuss at spectrumscale.org>
>    Subject: Re: [gpfsug-discuss] Importing a Spectrum Scale a filesystem
>    	from 4.2.3 cluster to 5.0.4.3 cluster
>    Message-ID: <C3494A35-F482-4E3D-B71D-AD7B3D9B02B1 at us.ibm.com>
>    Content-Type: text/plain; charset="utf-8"
> 
>    On a non-technical note, I wanted to remind everybody that if you?re doing a migration and you need to temporarily run both systems, IBM licensing allows you to do that without ceremony or formality, for up to 90 days under a thing called the ?Temporary Additional Use Policy?. You don?t need to register, ask beforehand, etc. Just go ahead.
> 
>    If you need the additional usage for more than 90 days, contact your seller and we?ll figure something out.
> 
>    Regards
> 
> 
> 
> 
>    Carl Zetie
>    Program Director
>    Offering Management
>    Spectrum Scale
>    ----
>    (919) 473 3318 ][ Research Triangle Park
>    carlz at us.ibm.com
> 
>    [signature_398516855]
> 
> 
>    -------------- next part --------------
>    An HTML attachment was scrubbed...
>    URL: <http://gpfsug.org/pipermail/gpfsug-discuss/attachments/20200529/010f20c4/attachment.html>
>    -------------- next part --------------
>    A non-text attachment was scrubbed...
>    Name: image001.png
>    Type: image/png
>    Size: 69558 bytes
>    Desc: image001.png
>    URL: <http://gpfsug.org/pipermail/gpfsug-discuss/attachments/20200529/010f20c4/attachment.png>
> 
>    ------------------------------
> 
>    _______________________________________________
>    gpfsug-discuss mailing list
>    gpfsug-discuss at spectrumscale.org
>    http://gpfsug.org/mailman/listinfo/gpfsug-discuss
> 
> 
>    End of gpfsug-discuss Digest, Vol 100, Issue 32
>    ***********************************************
> 
> _______________________________________________
> gpfsug-discuss mailing list
> gpfsug-discuss at spectrumscale.org
> http://gpfsug.org/mailman/listinfo/gpfsug-discuss

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20200529/5209cc60/attachment-0002.htm>