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

[Jan-Frode Myklebust]

I would not mount a GPFS filesystem within a GPFS filesystem. Technically
it should work, but I’d expect it to cause surprises if ever the lower
filesystem experienced problems. Alone, a filesystem might recover
automatically by remounting. But if there’s another filesystem mounted
within, I expect it will be a problem..

Much better to use symlinks.



  -jf

tor. 19. nov. 2020 kl. 18:01 skrev Caubet Serrabou Marc (PSI) <
marc.caubet at psi.ch>:

> 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
> _______________________________________________
> gpfsug-discuss mailing list
> gpfsug-discuss at spectrumscale.org
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>
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