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

[Caubet Serrabou Marc (PSI)]

Hi Jonathan,


thanks for sharing your opinions. In the sentence "Technically, mounting a filesystem on top of an existing filesystem should be possible" , I guess I was referring to that...

I was concerned about other technical reasons, such like how would this would affect GPFS policies, or how to properly proceed with proper mounting, or any other technical reasons to consider.

For the GPFS policies, I usually applied some of the existing GPFS policies based on directories, but after checking I realized that one can manage via device (never used policies in that way, at least for the simple but necessary use cases I have on the existing filesystems).


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
________________________________
From: gpfsug-discuss-bounces at spectrumscale.org <gpfsug-discuss-bounces at spectrumscale.org> on behalf of Jonathan Buzzard <jonathan.buzzard at strath.ac.uk>
Sent: Thursday, November 19, 2020 4:49:30 PM
To: gpfsug-discuss at spectrumscale.org
Subject: Re: [gpfsug-discuss] Mounting filesystem on top of an existing filesystem

On 19/11/2020 15:34, Caubet Serrabou Marc (PSI) wrote:
> 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.

This has all the hallmarks of either a Windows admin or a newbie
Linux/Unix admin :-)

Simply put /projects is mounted on top of whatever file system is
providing the root file system in the first place LOL.

Linux/Unix and/or GPFS does not give a monkeys about mounting another
file system *ANYWHERE* in it period because there is no other way of
doing it.

JAB.

--
Jonathan A. Buzzard                         Tel: +44141-5483420
HPC System Administrator, ARCHIE-WeSt.
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG
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