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<div dir="ltr">Having the actual file layouts would definitely help. There is one "normal" scenario where the PFL layout will be ignored, which is for files created with "open(O_APPEND)" (typically log files, or redirected output like "command >> file" ).
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<div>For performance and scalability reasons, the append-only files are by default 1-stripe files and do not specify a pool, though this is configurable via "mdd.*.append_stripe_count" and "mdd.*.append_pool".</div>
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<div>Recently this has come up as a point of confusion with observant users, especially with the increasing usage of PFL and multiple pools in the same filesystem. </div>
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<div>Two things we are looking to improve in this area (LU-17159):</div>
<div>- mark files that use the "append" layout with a flag so that they can be identified more easily (this would appear in "lfs getstripe output" and the man page)</div>
<div>- use only the first component of the PFL layout for the append files if no explicit append layout is configured. I think this would give more control to users, and be more "intuitive". </div>
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<div>Feedback is welcome. <br>
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<div dir="ltr">Cheers, Andreas</div>
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<blockquote type="cite">On May 12, 2025, at 06:51, Colin Faber via lustre-discuss <lustre-discuss@lists.lustre.org> wrote:<br>
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<div dir="ltr">\ufeff
<p dir="ltr">You don't mention the version. Also lfs getstripe of the parent directory and one of the files would be helpful as well</p>
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<div dir="ltr" class="gmail_attr">On Mon, May 12, 2025, 4:18\u202fAM Noskov, Dr. Sergey via lustre-discuss <<a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a>> wrote:<br>
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<p>Hello everyone,<u></u><u></u></p>
<p>we have two PFL pools in the lustre.<u></u><u></u></p>
<p>We notice that there are files that are in the directory of pool1, but for some reason they belong to pool2.<u></u><u></u></p>
<p>Would that be possible that PFL does not always work?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><span lang="EN-US" style="color:black">With best regards</span><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black"> <u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">Sergey Noskov<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black"> </span><span style="color:black"><u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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