[gpfsug-discuss] CES, Ganesha, and Filesystem_id

[Leonardo Sala]

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://github.com/nfs-ganesha/nfs-ganesha/issues/615

-- 
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
www.psi.ch
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