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/LUDOC-442 Lustre Documentation <p>Documentation needed for <a href="https://jira.whamcloud.com/browse/LU-11213" title="DNE3: remote mkdir() in ROOT/ by default" class="issue-link" data-issue-key="LU-11213"><del>LU-11213</del></a> DNE work</p> LUDOC-442

Documentation needed for LU-11213 DNE work

New Feature Blocker Resolved Fixed Lai Siyao Joseph Gmitter Tue, 11 Jun 2019 17:28:17 +0000 Thu, 7 Nov 2019 15:26:29 +0000 Thu, 7 Nov 2019 15:26:29 +0000 Lustre 2.13.0 Manual 0 3 <p>Lai once stated the following, which needs to be expanded upon for the manual:</p> <p>A new hash type "space" is added to balance MDT space usage, once a default directory stripe is set on a plain directory, e.g.<br/> lfs setdirstripe -D -i -1 -H space &lt;dir1&gt;</p> <p>The subsequent syscall "mkdir" (NB, not "lfs mkdir ...") under &lt;dir1&gt; will choose a MDT with balanced space usage, the policy is:</p> <ul> <li>if free inodes/blocks on all MDT are almost the same, choose MDT roundrobin.</li> <li>otherwise create more subdirectories on MDTs with more free inodes/blocks.</li> </ul> <p><a href="https://jira.whamcloud.com/secure/ViewProfile.jspa?name=laisiyao" class="user-hover" rel="laisiyao">laisiyao</a>: I know we spoke about this quite some time ago, but can you look at the latest copy of the manual and suggest where exactly that we should insert the above text? Is anything more needed to add?</p> <p>As we talked before, there doesn't exist a chapter for directory creation, so even the original interface introduced by <a href="https://jira.whamcloud.com/browse/LU-11213" title="DNE3: remote mkdir() in ROOT/ by default" class="issue-link" data-issue-key="LU-11213"><del>LU-11213</del></a> is changed by <a href="https://jira.whamcloud.com/browse/LU-12624" title="DNE3: striped directory allocate stripes by QoS" class="issue-link" data-issue-key="LU-12624"><del>LU-12624</del></a>: 'space' hash type is removed, and now 'lfs setdirstripe -D -I -1' will produce the same effect, that means, if the starting MDT offset is '-1', the directory will be created by MDT space/inode usage.</p> <p>Note that the patch for <a href="https://jira.whamcloud.com/browse/LU-12624" title="DNE3: striped directory allocate stripes by QoS" class="issue-link" data-issue-key="LU-12624"><del>LU-12624</del></a> <a href="https://review.whamcloud.com/#/c/35825/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/#/c/35825/</a> is not landed yet.</p> <p>OK, so you are proposing that we create a new section/chapter this and include the changes in <a href="https://jira.whamcloud.com/browse/LU-12624" title="DNE3: striped directory allocate stripes by QoS" class="issue-link" data-issue-key="LU-12624"><del>LU-12624</del></a> for that work. What area of the manual should we insert this section?</p> <p>Maybe not in a new section, we can add this in section "13.10. Creating a directory striped across multiple MDTs", explain the effect of argument '-<del>mdt-index' and '</del>-mdt-hash' of command 'lfs setdirstripe', and also explain default directory layout here.</p> <p>Joseph Gmitter (jgmitter@whamcloud.com) uploaded a new patch: <a href="https://review.whamcloud.com/36615" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/36615</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LUDOC-442" title="Documentation needed for LU-11213 DNE work" class="issue-link" data-issue-key="LUDOC-442"><del>LUDOC-442</del></a> dne: directory creation by space/inode<br/> Project: doc/manual<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: f15a832c2ea297df514ff54326fcfcd03237c33e</p> <p>Joseph Gmitter (jgmitter@whamcloud.com) merged in patch <a href="https://review.whamcloud.com/36615/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/36615/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LUDOC-442" title="Documentation needed for LU-11213 DNE work" class="issue-link" data-issue-key="LUDOC-442"><del>LUDOC-442</del></a> dne: directory creation by space/inode<br/> Project: doc/manual<br/> Branch: master<br/> Current Patch Set: <br/> Commit: ccce8bbf109d3531df7ae5b6c65af04e9b48a757</p> Gantt End to End LU-11213 Development Rank 1|i00i13: Rank (Obsolete) 9223372036854775807