https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-15307 Lustre <p>We have users that will set directory stripe count by using "<tt>-1</tt>" as in <br/> "<tt>lfs setdirstripe -c -1</tt>".</p> <p>Filesystem with small number of MDTs (4-8) this was ok. But as the MDT count gets lager (&gt;32) this is not always desirable. Most of the time we don't want users to set directory stripe counts so large. We would like config option for max default directory size setting for ("<tt>lfs setdirstripe -c -1</tt>"). But would still like the ability to allow setting stripe counts larger for those who explicitly request it, but not unintentionally.</p> LU-15307

Option to set max directory stripe count per filesystem

New Feature Critical Resolved Fixed Feng Lei Andreas Dilger easy Thu, 2 Dec 2021 06:27:59 +0000 Thu, 31 Mar 2022 22:14:03 +0000 Wed, 26 Jan 2022 14:32:35 +0000 Lustre 2.7.0 Lustre 2.15.0 0 4 <p>In addition to limiting the stripe count used when selecting "<tt>-c -1</tt>" it also makes sense to return an error from "<tt>lfs setdirstripe</tt>" when creating a <b>default</b> directory striping that has a stripe count &gt; 1 but does not have max-inherit set. There have repeatedly been problems hit when a filesystem is configured with "<tt>lfs setdirstripe -c N -D $MOUNT</tt>" (for any <tt>N</tt> &gt; 1) causing <tt>REMOTE_PARENT_DIR</tt> to be filled or have tens of millions of entries, excessive MDT inode usage, performance issues, etc.</p> <p>With automatic DNE MDT space balancing (<a href="https://jira.whamcloud.com/browse/LU-13440" title="DNE3: limit directory default layout inheritance" class="issue-link" data-issue-key="LU-13440"><del>LU-13440</del></a>) the need to stripe directories by default is almost completely eliminated. It should still be possible to set this by explicitly specifying <tt>--max-inherit=N</tt>, but this is too dangerous to let users shoot themselves in the foot by accident by what "seems" like a good idea but is actually very bad over time.</p> <p>Split the requirement of <tt>lfs setdirstripe</tt> command to <a href="https://jira.whamcloud.com/browse/LU-15314" title="set default max-inherit to 3 for default dir stripe policy if stripe count is not 0 or 1" class="issue-link" data-issue-key="LU-15314"><del>LU-15314</del></a></p> <p>"Feng, Lei &lt;flei@whamcloud.com&gt;" uploaded a new patch: <a href="https://review.whamcloud.com/45724" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/45724</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-15307" title="Option to set max directory stripe count per filesystem" class="issue-link" data-issue-key="LU-15307"><del>LU-15307</del></a> lod: add option to set max dir stripe count<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: 5aa4307f3d5d058f09f1636180b541c870b44031</p> <p>"Oleg Drokin &lt;green@whamcloud.com&gt;" merged in patch <a href="https://review.whamcloud.com/45724/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/45724/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-15307" title="Option to set max directory stripe count per filesystem" class="issue-link" data-issue-key="LU-15307"><del>LU-15307</del></a> lod: add option to set max dir stripe count<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: 09c83ef26cca5b27bfbc05538c2df93d5a396fb7</p> <p>Landed for 2.15</p> Cloners LU-9162 Related LU-10329 LU-15314 LUDOC-501 Development Rank 1|i02bcv: Rank (Obsolete) 9223372036854775807