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-12303 Lustre <p>Currently for each lnet_health_interval the LNet health is incremented by 1. The maximum LNet health value so it is possible to take up to 1000 seconds to recovery depending on the setup. A better way to handle this is to use the lnet_health_interval by the same amount that the health went by it.</p> Any lustre 2.12 system with LNet health enabled LU-12303

Use lnet_health_sensitivity for restoring health for each lnet_recovery_internal

Improvement Minor Resolved Fixed Amir Shehata James A Simmons Wed, 15 May 2019 20:37:59 +0000 Fri, 16 Oct 2020 06:21:54 +0000 Tue, 31 Mar 2020 11:37:59 +0000 Lustre 2.13.0 Lustre 2.14.0 0 5 <p>If the <tt>lnet_health_sensitivity</tt> was also used to increment the interface health, then there would be no point in having a variable <tt>lnet_health_sensitivity</tt> value. It would mean that there are N health decrements and the same N health increments for an interface. Also note (AFAIK, but Amir to confirm) that while the retry interval is 1s, it will increment the health for every successful RPC sent/received.</p> <p>The reason that <tt>lnet_health_sensitivity=100</tt> for decrements, but 1 for increments, this implies that the interface can only lose 1/100 = 1% of messages on that interface for it to continue to be in use. If it fails RPCs more than 1% of the time it will decrement faster than increment, which is good because you don't want to be using that interface. If it fails less than 1% it will generally remain in use. This "minimum acceptable failure ratio" is tunable by <tt>lnet_health_sensitivity</tt>.</p> <p>Your docs are wrong <img class="emoticon" src="https://jira.whamcloud.com/images/icons/emoticons/smile.png" height="16" width="16" align="absmiddle" alt="" border="0"/> It states at</p> <p><a href="https://wiki.whamcloud.com/display/LNet/LNet+Health+User+Documentation" class="external-link" target="_blank" rel="nofollow noopener">https://wiki.whamcloud.com/display/LNet/LNet+Health+User+Documentation</a></p> <p>that the health increments every time interval which is one seconds. By those docs it could be 1000 seconds before the interface is seen as healthy.</p> <p>Amir Shehata (ashehata@whamcloud.com) uploaded a new patch: <a href="https://review.whamcloud.com/36920" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/36920</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-12303" title="Use lnet_health_sensitivity for restoring health for each lnet_recovery_internal" class="issue-link" data-issue-key="LU-12303"><del>LU-12303</del></a> lnet: recover health at same rate as dec<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: 601be615b8409dc74f2f6e5c49fe0810bc443a73</p> <p>Oleg Drokin (green@whamcloud.com) merged in patch <a href="https://review.whamcloud.com/36920/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/36920/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-12303" title="Use lnet_health_sensitivity for restoring health for each lnet_recovery_internal" class="issue-link" data-issue-key="LU-12303"><del>LU-12303</del></a> lnet: recover health at same rate as dec<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: 1d94a29dbc018fd00aa1c8a7a7ae343e0c9a4b83</p> <p>Landed for 2.14</p> Related LU-12292 Development Rank 1|i00gcf: Rank (Obsolete) 9223372036854775807