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-10289 Lustre <p>The SHORTIO functionality was landed in Lustre 2.11, at the same time as DoM, so these features do not currently work together. </p> <p>It <em>may</em> just be a matter of enabling the OBD_CONNECT_SHORTIO feature flag on the MDS connection, but it may be that more work is needed. </p> <p>One related possibility is to include DoM file’s dirty data in the close RPC (or conversely a close in the write RPC, whichever makes more sense). That would further reduce the RPC count for small files. Also, since the DoM close will also be updating attributes like atime or mtime/ctime, we may as well write the data at the same time to avoid more disk IO if they are done in separate RPCs. </p> LU-10289

DoM: add SHORTIO support for MDS RPCs

Technical task LU-10176 Minor Resolved Fixed Mikhail Pershin Andreas Dilger DoM Tue, 28 Nov 2017 03:41:14 +0000 Wed, 7 Mar 2018 21:27:21 +0000 Wed, 7 Mar 2018 21:26:23 +0000 Lustre 2.11.0 0 4 <p>Hm. I... I think we didn't add SHORT_IO to the OST connection flags (server, not client side)? I'm confused. I clearly remember manually verifying it was working, by noting the lack of an RDMA.</p> <p>Am I wrong? Did we not really enable it? I'll try to test a bit later.</p> <p>Uck. Short i/o doesn't seem to be working at all, even with the flags added. Not sure what changed from when I tested it carefully a while back, but something did on the way to landing, it seems.</p> <p>I'll try to find time later to investigate.</p> <p>Mike, does this mean you're going to figure out if short i/o is working on the OST side too? I haven't dug in yet.</p> <p>I see <tt>OBD_CONNECT_SHORTIO</tt> is included in <tt>ocd_connect_flags</tt> for the OST, but not for the MDT <tt>ocd_connect_flags</tt>. However, I do NOT see <tt>OBD_CONNECT_SHORTIO</tt> in <tt>OST_CONNECT_SUPPORTED</tt> or <tt>MDT_CONNECT_SUPPORTED</tt>. Maybe you missed to add it to the patch, but it was on the server that you tested against?</p> <p>Must be, yeah. Uck!</p> <p>I also added it to OST_CONNECT_SUPPORTED real quick and still didn't get short i/o yesterday. Not sure why and not sure when I can dig in. I'll try to find time soon.</p> <p>I actually did this in:<br/> <a href="https://review.whamcloud.com/#/c/30435/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/#/c/30435/</a></p> <p>Which I marked against <a href="https://jira.whamcloud.com/browse/LU-1757" title="Short I/O support" class="issue-link" data-issue-key="LU-1757"><del>LU-1757</del></a>, because we forgot to enable the feature in the OST flags too.</p> <p><a href="https://review.whamcloud.com/#/c/30435/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/#/c/30435/</a> (<a href="https://jira.whamcloud.com/browse/LU-1757" title="Short I/O support" class="issue-link" data-issue-key="LU-1757"><del>LU-1757</del></a>) landed to master. Is there anything else left for this particular issue? It appears we can close this out as resolved by <a href="https://jira.whamcloud.com/browse/LU-1757" title="Short I/O support" class="issue-link" data-issue-key="LU-1757"><del>LU-1757</del></a>?</p> <p>Agreed, sorry I didn't get it earlier.</p> <p>Resolved in <a href="https://jira.whamcloud.com/browse/LU-1757" title="Short I/O support" class="issue-link" data-issue-key="LU-1757"><del>LU-1757</del></a>.</p> <p>Thanks Patrick.</p> Related LU-1757 Development Rank 1|hzzobb: Rank (Obsolete) 9223372036854775807