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On Mar 16, 2023, at 04:50, Passerini Marco <<a href="mailto:marco.passerini@cscs.ch" class="">marco.passerini@cscs.ch</a>> wrote:<br class="">
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By trial and error, I found that, when using project quotas, the maximum ID available is<span class="Apple-converted-space"> </span><span class="">4294967294</span>. Is this correct?</div>
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Yes, the "-1" ID is reserved for error conditions.<br class="">
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">If I assign quota to a lot of project IDs, is the performance expected to go down more than having just a few or is it fixed?</div>
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<div>Probably if you have millions or billions of different IDs there would be some performance loss, at a minimum just because the quota files will consume a lot of disk space and memory to manage. I don't think we've done specific scaling testing for the
number of project IDs, but it has worked well for the "expected" number of different IDs at production sites (in the 10,000s).</div>
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<div>I've recommended to a few sites that want to have a "unified" quota to use e.g. PROJID=UID for user directories, PROJID=1M + UID for scratch, and PROJID=2M+N for independent projects, just to make the PROJIDs easily identified (at least until someone implements
LU-13335 to do projid<->name mapping).</div>
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<div>How many IDs were you thinking of using?</div>
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<div>Cheers, Andreas</div>
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<div>Andreas Dilger</div>
<div>Lustre Principal Architect</div>
<div>Whamcloud</div>
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