[gpfsug-discuss] CES, Ganesha, and Filesystem_id

[Wahl, Edward]

I vaguely recall seeing this and testing it.  My notes to myself say: ‘As long as the export_id is unique, you are fine.’   See the manuals, ganesha loves Camel Case so it’s more than likely actually “Export_Id” or some such.

Ed Wahl
Ohio Supercomputer Center

From: gpfsug-discuss <gpfsug-discuss-bounces at gpfsug.org> On Behalf Of Leonardo Sala
Sent: Tuesday, June 27, 2023 10:18 AM
To: gpfsug-discuss at spectrumscale.org
Subject: [gpfsug-discuss] CES, Ganesha, and Filesystem_id

Hallo, we are checking our current CES configuration, and we noticed that by default GPFS puts always Filesystem_Id=666. 666 [*], no matter which Export_Id value the export has. To my understanding (which is poor!), this means that all clients


Hallo,

we are checking our current CES configuration, and we noticed that by default GPFS puts always Filesystem_Id=666.666 [*], no matter which Export_Id value the export has. To my understanding (which is poor!), this means that all clients will see all our exports (~20) with the same device number, creating various possible issues (e.g. file state handles). Questions:

* is there a reason for such default value? If we change it, are there unpleasant effects we could see?

* what would be a reasonable value? Looking around I saw that Filesystem_Id = Export_Id.Export_Id is quite common, with the possible issue of using the forbidden 152.152 [**]

* what happens if we actually remove the Filesytem_Id parameter from gpfs.ganesha.exports.conf?

* is there a way to modify Filesystem_Id in gpfs.ganesha.exports.conf without editing the file, eg using mmnfs commands (seems not, but I might be mistaken)?

Thanks a lot!

cheers

leo



[*] https://www.ibm.com/docs/en/storage-scale/5.0.4?topic=exports-making-bulk-changes-nfs<https://urldefense.com/v3/__https:/www.ibm.com/docs/en/storage-scale/5.0.4?topic=exports-making-bulk-changes-nfs__;!!KGKeukY!2ZoLSJiACv5XMmk6G9XTy958E9yslS6wIGqy1RaI3D0d_6hraQHFRLCEBCWh73texj92o7WDULi105hTHXqh$>

[**] https://github.com/nfs-ganesha/nfs-ganesha/issues/615<https://urldefense.com/v3/__https:/github.com/nfs-ganesha/nfs-ganesha/issues/615__;!!KGKeukY!2ZoLSJiACv5XMmk6G9XTy958E9yslS6wIGqy1RaI3D0d_6hraQHFRLCEBCWh73texj92o7WDULi10-6QZN1l$>

--

Paul Scherrer Institut

Dr. Leonardo Sala

Group Leader Data Analysis and Research Infrastructure

Deputy Department Head a.i Science IT Infrastructure and Services department

Science IT Infrastructure and Services department (AWI)

WHGA/036

Forschungstrasse 111

5232 Villigen PSI

Switzerland



Phone: +41 56 310 3369

leonardo.sala at psi.ch<mailto:leonardo.sala at psi.ch>

www.psi.ch<https://urldefense.com/v3/__http:/www.psi.ch__;!!KGKeukY!2ZoLSJiACv5XMmk6G9XTy958E9yslS6wIGqy1RaI3D0d_6hraQHFRLCEBCWh73texj92o7WDULi105e6ItOo$>
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