[gpfsug-discuss] Spectrum Scale CES and remote file system mounts

[valleru at cbio.mskcc.org]

Thanks Mathiaz,
Yes i do understand the concern, that if one of the remote file systems go down abruptly - the others will go down too.

However, i suppose we could bring down one of the filesystems before a planned downtime?
For example, by unexporting the filesystems on NFS/SMB before the downtime?

I might not want to be in a situation, where i have to bring down all the remote filesystems because of planned downtime of one of the remote clusters.

Regards,
Lohit

On May 3, 2018, 7:41 AM -0400, Mathias Dietz <MDIETZ at de.ibm.com>, wrote:
> Hi Lohit,
>
> >I am thinking of using a single CES protocol cluster, with remote mounts from 3 storage clusters.
> Technically this should work fine (assuming all 3 clusters use the same uids/guids). However this has not been tested in our Test lab.
>
>
> >One thing to watch, be careful if your CES root is on a remote fs, as if that goes away, so do all CES exports.
> Not only the ces root file system is a concern, the whole CES cluster will go down if any remote file systems with NFS exports is not available.
> e.g. if remote cluster 1 is not available, the CES cluster will unmount the corresponding file system which will lead to a NFS failure on all CES nodes.
>
>
> Mit freundlichen Grüßen / Kind regards
>
> Mathias Dietz
>
> Spectrum Scale Development - Release Lead Architect (4.2.x)
> Spectrum Scale RAS Architect
> ---------------------------------------------------------------------------
> IBM Deutschland
> Am Weiher 24
> 65451 Kelsterbach
> Phone: +49 70342744105
> Mobile: +49-15152801035
> E-Mail: mdietz at de.ibm.com
> -----------------------------------------------------------------------------
> IBM Deutschland Research & Development GmbH
> Vorsitzender des Aufsichtsrats: Martina Koederitz, Geschäftsführung: Dirk WittkoppSitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294
>
>
>
> From:        valleru at cbio.mskcc.org
> To:        gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
> Date:        01/05/2018 16:34
> Subject:        Re: [gpfsug-discuss] Spectrum Scale CES and remote file system mounts
> Sent by:        gpfsug-discuss-bounces at spectrumscale.org
>
>
>
> Thanks Simon.
> I will make sure i am careful about the CES root and test nfs exporting more than 2 remote file systems.
>
> Regards,
> Lohit
>
> On Apr 30, 2018, 5:57 PM -0400, Simon Thompson (IT Research Support) <S.J.Thompson at bham.ac.uk>, wrote:
> You have been able to do this for some time, though I think it's only just supported.
>
> We've been exporting remote mounts since CES was added.
>
> At some point we've had two storage clusters supplying data and at least 3 remote file-systems exported over NFS and SMB.
>
> One thing to watch, be careful if your CES root is on a remote fs, as if that goes away, so do all CES exports. We do have CES root on a remote fs and it works, just be aware...
>
> Simon
> ________________________________________
> From: gpfsug-discuss-bounces at spectrumscale.org [gpfsug-discuss-bounces at spectrumscale.org] on behalf of valleru at cbio.mskcc.org [valleru at cbio.mskcc.org]
> Sent: 30 April 2018 22:11
> To: gpfsug main discussion list
> Subject: [gpfsug-discuss] Spectrum Scale CES and remote file system mounts
>
> Hello All,
>
> I read from the below link, that it is now possible to export remote mounts over NFS/SMB.
>
> https://www.ibm.com/support/knowledgecenter/en/STXKQY_5.0.0/com.ibm.spectrum.scale.v5r00.doc/bl1adv_protocoloverremoteclu.htm
>
> I am thinking of using a single CES protocol cluster, with remote mounts from 3 storage clusters.
> May i know, if i will be able to export the 3 remote mounts(from 3 storage clusters) over NFS/SMB from a single CES protocol cluster?
>
> Because according to the limitations as mentioned in the below link:
>
> https://www.ibm.com/support/knowledgecenter/STXKQY_5.0.0/com.ibm.spectrum.scale.v5r00.doc/bl1adv_limitationofprotocolonRMT.htm
>
> It says “You can configure one storage cluster and up to five protocol clusters (current limit).”
>
>
> Regards,
> Lohit
> _______________________________________________
> 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
>
>
>
> _______________________________________________
> 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/20180503/d62276b1/attachment-0002.htm>