<div><br></div><div dir="auto">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..</div><div dir="auto"><br></div><div dir="auto">Much better to use symlinks.</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"> -jf</div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">tor. 19. nov. 2020 kl. 18:01 skrev Caubet Serrabou Marc (PSI) <<a href="mailto:marc.caubet@psi.ch">marc.caubet@psi.ch</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)">
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<p style="font-family:Calibri,Helvetica,sans-serif">Hi Simon,</p>
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<p style="font-family:Calibri,Helvetica,sans-serif">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.<br>
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<p style="font-family:Calibri,Helvetica,sans-serif">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. </p>
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<p style="font-family:Calibri,Helvetica,sans-serif">Thanks a lot for the hints, these are very useful. I'll test that.<br>
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<p style="font-family:Calibri,Helvetica,sans-serif">Cheers,<br>
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<p style="font-family:Calibri,Helvetica,sans-serif">Marc <br>
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<div style="font-family:Tahoma">_________________________________________________________<br>
Paul Scherrer Institut <br>
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Marc Caubet Serrabou<br>
Building/Room: OHSA/014</div>
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<b style="font-family:Calibri,sans-serif">Sent:</b> Thursday, November 19, 2020 5:42:07 PM<br>
<b style="font-family:Calibri,sans-serif">To:</b> gpfsug main discussion list<br>
<b style="font-family:Calibri,sans-serif">Subject:</b> Re: [gpfsug-discuss] Mounting filesystem on top of an existing filesystem</font>
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<p class="MsoNormal"><span>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.<u></u><u></u></span></p>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
<p class="MsoNormal"><span>Simon<u></u><u></u></span></p>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:12pt;color:black">From: </span></b><span style="font-size:12pt;color:black"><<a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" target="_blank">gpfsug-discuss-bounces@spectrumscale.org</a>> on behalf of "<a href="mailto:marc.caubet@psi.ch" target="_blank">marc.caubet@psi.ch</a>" <<a href="mailto:marc.caubet@psi.ch" target="_blank">marc.caubet@psi.ch</a>><br>
<b>Reply to: </b>"<a href="mailto:gpfsug-discuss@spectrumscale.org" target="_blank">gpfsug-discuss@spectrumscale.org</a>" <<a href="mailto:gpfsug-discuss@spectrumscale.org" target="_blank">gpfsug-discuss@spectrumscale.org</a>><br>
<b>Date: </b>Thursday, 19 November 2020 at 15:39<br>
<b>To: </b>"<a href="mailto:gpfsug-discuss@spectrumscale.org" target="_blank">gpfsug-discuss@spectrumscale.org</a>" <<a href="mailto:gpfsug-discuss@spectrumscale.org" target="_blank">gpfsug-discuss@spectrumscale.org</a>><br>
<b>Subject: </b>[gpfsug-discuss] Mounting filesystem on top of an existing filesystem<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p><span style="font-size:12pt;color:black">Hi,<u></u><u></u></span></p>
<p><span style="font-size:12pt;color:black"><u></u> <u></u></span></p>
<p><span style="font-size:12pt;color:black">I have a filesystem holding many projects (i.e., mounted under /projects), each project is managed with filesets.
<u></u><u></u></span></p>
<p><span style="font-size:12pt;color:black">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.<u></u><u></u></span></p>
<p><span style="font-size:12pt;color:black"><u></u> <u></u></span></p>
<p><span style="font-size:12pt;color:black">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?<u></u><u></u></span></p>
<p><span style="font-size:12pt;color:black">Another alternative would be independent mount point + symlink, but I really would prefer to avoid symlinks.<u></u><u></u></span></p>
<p><span style="font-size:12pt;color:black"><u></u> <u></u></span></p>
<p><span style="font-size:12pt;color:black">Thanks a lot,<u></u><u></u></span></p>
<p><span style="font-size:12pt;color:black">Marc <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:black">_________________________________________________________<br>
Paul Scherrer Institut <br>
High Performance Computing & Emerging Technologies<br>
Marc Caubet Serrabou<br>
Building/Room: OHSA/014<u style="font-family:Tahoma,sans-serif"></u><u style="font-family:Tahoma,sans-serif"></u></span></p>
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<p class="MsoNormal"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:black">Forschungsstrasse, 111<u style="font-family:Tahoma,sans-serif"></u><u style="font-family:Tahoma,sans-serif"></u></span></p>
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<p class="MsoNormal"><span style="font-size:10pt;font-family:Tahoma,sans-serif;color:black">5232 Villigen PSI<br>
Switzerland<br>
<br>
Telephone: +41 56 310 46 67<br>
E-Mail: <a href="mailto:marc.caubet@psi.ch" target="_blank" style="font-family:Tahoma,sans-serif">marc.caubet@psi.ch</a><u style="font-family:Tahoma,sans-serif"></u><u style="font-family:Tahoma,sans-serif"></u></span></p>
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