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

[Uwe Falke]

Just the risk your parent system dies which will block your access to the 
child file system mounted on a mount point within. 
If that is not  bothering , go ahead mount stacks . As for the symling 
though : it  is also gone if the parent dies :-). 

Mit freundlichen Grüßen / Kind regards

Dr. Uwe Falke
IT Specialist
Hybrid Cloud Infrastructure / Technology Consulting & Implementation 
Services
+49 175 575 2877 Mobile
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From:   KG <spectrumscale at kiranghag.com>
To:     gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:   19/11/2020 17:41
Subject:        [EXTERNAL] Re: [gpfsug-discuss] Mounting filesystem on top 
of an existing  filesystem
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



You can also set mount priority on filesystems so that gpfs can try to 
mount them in order...parent first

On Thu, Nov 19, 2020, 21:19 Jonathan Buzzard <
jonathan.buzzard at strath.ac.uk> wrote:
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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