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-10018 Lustre <p>given MDT updates statfs data from all OSTs every second it can provide data to the clients. this can be useful for idling connections feature as we won't need to connect to OST for a single OST_STATFS RPC. this can also make df less expensive in terms of RPC and faster.</p> LU-10018

MDT as a statfs proxy

Improvement Minor Resolved Fixed Alex Zhuravlev Alex Zhuravlev OSJ Fri, 22 Sep 2017 00:34:38 +0000 Wed, 5 Jun 2019 00:28:29 +0000 Sat, 1 Sep 2018 05:55:48 +0000 Lustre 2.12.0 0 6 <p>Not sure why this wasn't added automatically:</p> <p><a href="https://review.whamcloud.com/29136" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/29136</a></p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>LU-10018 protocol: MDT as a statfs proxy MDT can act as a proxy for statfs data. this should make df faster (RTT vs RTT*(#MDTs+11)) and enable idling connections so that clients don't connect to each OST just to report statfs data. the protocol has been changing slightly to let MDT differentiate self and aggregated statfs. also, obd_statfs has got a new field "granted" where OST reports how much space has been granted to the requesting MDT so that space can be added to available space. TODO: - clients to use different MDTs to balance load Change-Id: I59e03cb5abf809ae8820f874ec51dd2b74e1806c Signed-off-by: Alex Zhuravlev &lt;alexey.zhuravlev@intel.com&gt; </pre> </div></div> <p>Oleg Drokin (green@whamcloud.com) merged in patch <a href="https://review.whamcloud.com/29136/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/29136/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-10018" title="MDT as a statfs proxy" class="issue-link" data-issue-key="LU-10018"><del>LU-10018</del></a> protocol: MDT as a statfs proxy<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: b500d5193360711a6c6b07497f34e61cc590cf19</p> <p>Landed for 2.12</p> Blocker LU-7236 Related LU-11375 LU-7770 LU-11721 LU-7880 LU-7233 LU-9555 Development Rank 1|hzzklr: Rank (Obsolete) 9223372036854775807