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-11189 Lustre <p>We're running into a problem that somehow OST devices are really slow to serve write requests. However, clients don't the situation so they would just keep sending requests, eventually this causes RPC timeout.</p> <p>This work is trying to relieve the problem by introducing a flow control on the OSC where it holds sending more requests as soon as it receives early reply.</p> LU-11189

OSC flow control

Improvement Minor Open Unresolved Zhenyu Xu Jinshan Xiong Sat, 28 Jul 2018 00:47:48 +0000 Thu, 26 Jan 2023 22:41:02 +0000 0 4 <p>Jinshan Xiong (jinshan.xiong@gmail.com) uploaded a new patch: <a href="https://review.whamcloud.com/32895" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/32895</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-11189" title="OSC flow control" class="issue-link" data-issue-key="LU-11189">LU-11189</a> osc: flow control for OSC<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: da7e7ec610d1023906c4354605c1542071195735</p> <p>On a related note, if there is heavy random read traffic on a large input file that is causing high IOPS and slowdown, you could consider to use "<tt>lfs ladvise willread /path/to/file</tt>" to prefetch the into RAM on the OST(s) it is located on. This requires that the input file is striped across enough OSTs to fit into RAM. </p> <p>Bobijam, could you please take a look at this patch and refresh it.</p> <p>I think we are still seeing similar problems under heavy load.</p> Related LU-12864 LU-11092 Development Rank 1|hzzzz3: Rank (Obsolete) 9223372036854775807