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<p>Hi Jonathan,</p>
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<p>thanks for sharing your opinions. In the sentence <i>"</i><font style="font-family:Calibri,Helvetica,sans-serif,serif,"EmojiFont"" size="3" face="Calibri,Helvetica,sans-serif" color="black"><span id="x_divtagdefaultwrapper" style="font-size:12pt"><i>Technically,
mounting a filesystem on top of an existing filesystem should be possible"</i> </span></font><span>, I guess I was referring to that...</span></p>
<p>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.<br>
</p>
<p>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).<br>
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<p>Thanks a lot,</p>
<p>Marc <br>
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<div class="x_PlainText">_________________________________________________________<br>
Paul Scherrer Institut <br>
High Performance Computing & Emerging Technologies<br>
Marc Caubet Serrabou<br>
Building/Room: OHSA/014</div>
<div class="x_PlainText"><font size="2"><span style="font-size:10pt">Forschungsstrasse, 111</span></font></div>
<div class="x_PlainText">5232 Villigen PSI<br>
Switzerland<br>
<br>
Telephone: +41 56 310 46 67<br>
E-Mail: marc.caubet@psi.ch</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> gpfsug-discuss-bounces@spectrumscale.org <gpfsug-discuss-bounces@spectrumscale.org> on behalf of Jonathan Buzzard <jonathan.buzzard@strath.ac.uk><br>
<b>Sent:</b> Thursday, November 19, 2020 4:49:30 PM<br>
<b>To:</b> gpfsug-discuss@spectrumscale.org<br>
<b>Subject:</b> Re: [gpfsug-discuss] Mounting filesystem on top of an existing filesystem</font>
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<div class="PlainText">On 19/11/2020 15:34, Caubet Serrabou Marc (PSI) wrote:<br>
> Hi,<br>
> <br>
> <br>
> I have a filesystem holding many projects (i.e., mounted under <br>
> /projects), each project is managed with filesets.<br>
> <br>
> I have a new big project which should be placed on a separate filesystem <br>
> (blocksize, replication policy, etc. will be different, and subprojects <br>
> of it will be managed with filesets). Ideally, this filesystem should be <br>
> mounted in /projects/newproject.<br>
> <br>
> <br>
> Technically, mounting a filesystem on top of an existing filesystem <br>
> should be possible, but, is this discouraged for any reason? How GPFS <br>
> would behave with that and is there a technical reason for avoiding this <br>
> setup?<br>
> <br>
> Another alternative would be independent mount point + symlink, but I <br>
> really would prefer to avoid symlinks.<br>
<br>
This has all the hallmarks of either a Windows admin or a newbie <br>
Linux/Unix admin :-)<br>
<br>
Simply put /projects is mounted on top of whatever file system is <br>
providing the root file system in the first place LOL.<br>
<br>
Linux/Unix and/or GPFS does not give a monkeys about mounting another <br>
file system *ANYWHERE* in it period because there is no other way of <br>
doing it.<br>
<br>
JAB.<br>
<br>
-- <br>
Jonathan A. Buzzard Tel: +44141-5483420<br>
HPC System Administrator, ARCHIE-WeSt.<br>
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG<br>
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