[gpfsug-discuss] CES, Ganesha, and Filesystem_id
Christof Schmitt
christof.schmitt at us.ibm.com
Wed Jun 28 15:20:41 BST 2023
Is the parameter set in your config? If so, then yes, remove it.
Regards,
Christof
On Wed, 2023-06-28 at 15:49 +0200, Leonardo Sala wrote:
Hi Christof, thanks! So the preferred way should be not to have Filesystem_Id. If I have understood correctly, this is anyhow set up by default in CES to 666. 666, so the suggested procedure during the CES setup should be to manually modify
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Hi Christof,
thanks! So the preferred way should be not to have Filesystem_Id. If I have understood correctly, this is anyhow set up by default in CES to 666.666, so the suggested procedure during the CES setup should be to manually modify gpfs.ganesha.exports.conf and remove this parameter from all the exports, is that correct? Is there an easier way, or is there a plan to remove the 666.666 default value?
In our case, we do rely on two separated CES clusters (one in prod and one in stand by, so that we can perform upgrades with no downtime by migrating the IPs from one to the other), so it might be safer to explicilty set Filesystem_Id, to ensure consistency among the cluster - would that make sense?
Thanks again!
Regards
leo
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
<mailto:leonardo.sala at psi.ch>
leonardo.sala at psi.ch
<http://www.psi.ch>
www.psi.ch
On 6/28/23 15:22, Christof Schmitt wrote:
After another discussion it turns out that this parameter is not required. While my previous comment is correct, that there is the need to have unique handles across file systems, GPFS already provides that information and Ganesha handles that correctly. So there is no need to set the parameter in the Ganesha config.
Regards,
Christof
On Wed, 2023-06-28 at 14:33 +0200, Leonardo Sala wrote:
Hi Christof, thanks a lot! In our case we are exporting multiple filesets from 2 filesystems, I guess we should fix unique Fileset_IDs for each fileset? What would happen in case we just remove the Fileset_id parameter, as suggested by the
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Hi Christof,
thanks a lot! In our case we are exporting multiple filesets from 2 filesystems, I guess we should fix unique Fileset_IDs for each fileset? What would happen in case we just remove the Fileset_id parameter, as suggested by the ganesha docs?
Regards
leo
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
<mailto:leonardo.sala at psi.ch>
leonardo.sala at psi.ch
<http://www.psi.ch>
www.psi.ch
On 6/28/23 14:22, Christof Schmitt wrote:
The "FileSystem_Id" is a unique identifier for the file system. The technical background is that Ganesha asks the file system for a file handle, but that is only unique within the file system. If there are NFS exports on different file systems, there needs to be a way to make the file handles unique across multiple file systems. So if there are NFS exports on different file systems, this parameter should be set with a unique value for each file system. If there is only one file system with NFS exports, then this should not be necessary.
Regards,
Christof
On Wed, 2023-06-28 at 08:53 +0200, Leonardo Sala wrote:
Hi Ed, thanks! In our case we do have unique export ids, but the same fsid, and this seems to create issues. Also, reading Ganesha docs, I can see [*]: FileSystem_ID EXPORT Option There is an EXPORT config option, FileSystem_ID. This really
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Hi Ed,
thanks! In our case we do have unique export ids, but the same fsid, and this seems to create issues. Also, reading Ganesha docs, I can see [*]:
FileSystem_ID EXPORT Option
There is an EXPORT config option, FileSystem_ID. This really should not be used, all it does it designate an fsid to be used with the attributes of all objects in the export. It will be folded to fit into NFSv3. Because it applies to the entire export, it prevents exporting multiple file systems since there will likely be issues with collision of inode numbers on the client.
so before touching the defaults in GPFS CES configuration I would like some guidance or experiences from this mlist :)
cheers
leo
[*] https://github.com/nfs-ganesha/nfs-ganesha/wiki/File-Systems#FileSystem_ID_EXPORT_Option<https://github.com/nfs-ganesha/nfs-ganesha/wiki/File-Systems#FileSystem_ID_EXPORT_Option>
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
<mailto:leonardo.sala at psi.ch>
leonardo.sala at psi.ch
<http://www.psi.ch>
www.psi.ch
On 6/27/23 19:41, Wahl, Edward wrote:
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><mailto: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<mailto: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://github.com/nfs-ganesha/nfs-ganesha/issues/615<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
<mailto:leonardo.sala at psi.ch>
leonardo.sala at psi.ch
<http://www.psi.ch>
www.psi.ch
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