[gpfsug-discuss] Mounting filesystem on top of an existing filesystem

[Caubet Serrabou Marc (PSI)]

Hi Simon,


that's a very good point, thanks a lot :) I have it remotely mounted on a client cluster, so I will consider priorities when mounting the filesystems with remote cluster mount. That's very useful.

Also, as far as I saw, same approach can be also applied to local mounts (via mmchfs) during daemon startup with the same option --mount-priority.


Thanks a lot for the hints, these are very useful. I'll test that.


Cheers,

Marc

_________________________________________________________
Paul Scherrer Institut
High Performance Computing & Emerging Technologies
Marc Caubet Serrabou
Building/Room: OHSA/014
Forschungsstrasse, 111
5232 Villigen PSI
Switzerland

Telephone: +41 56 310 46 67
E-Mail: marc.caubet at psi.ch
________________________________
From: gpfsug-discuss-bounces at spectrumscale.org <gpfsug-discuss-bounces at spectrumscale.org> on behalf of Simon Thompson <S.J.Thompson at bham.ac.uk>
Sent: Thursday, November 19, 2020 5:42:07 PM
To: gpfsug main discussion list
Subject: Re: [gpfsug-discuss] Mounting filesystem on top of an existing filesystem

If it is a remote cluster mount from your clients (hopefully!), you might want to look at priority to order mounting of the file-systems. I don’t know what would happen if the overmounted file-system went away, you would likely want to test.

Simon

From: <gpfsug-discuss-bounces at spectrumscale.org> on behalf of "marc.caubet at psi.ch" <marc.caubet at psi.ch>
Reply to: "gpfsug-discuss at spectrumscale.org" <gpfsug-discuss at spectrumscale.org>
Date: Thursday, 19 November 2020 at 15:39
To: "gpfsug-discuss at spectrumscale.org" <gpfsug-discuss at spectrumscale.org>
Subject: [gpfsug-discuss] Mounting filesystem on top of an existing filesystem


Hi,



I have a filesystem holding many projects (i.e., mounted under /projects), each project is managed with filesets.

I have a new big project which should be placed on a separate filesystem (blocksize, replication policy, etc. will be different, and subprojects of it will be managed with filesets). Ideally, this filesystem should be mounted in /projects/newproject.



Technically, mounting a filesystem on top of an existing filesystem should be possible, but, is this discouraged for any reason? How GPFS would behave with that and is there a technical reason for avoiding this setup?

Another alternative would be independent mount point + symlink, but I really would prefer to avoid symlinks.



Thanks a lot,

Marc
_________________________________________________________
Paul Scherrer Institut
High Performance Computing & Emerging Technologies
Marc Caubet Serrabou
Building/Room: OHSA/014
Forschungsstrasse, 111
5232 Villigen PSI
Switzerland

Telephone: +41 56 310 46 67
E-Mail: marc.caubet at psi.ch
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