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-3828 Lustre <p>The procfs tuneable parameter that is used to define the default HSM archive ID is cannot be set persistently using lctl conf_param or lctl set_param -P. This is by design and is in part because the "hsm" procfs subtree is not created unless and until the HSM feature is itself activated.</p> <p>The parameter variable is: mdt.&lt;fsname&gt;-MDT*.hsm.archive_id</p> <p>Please consider a mechanism whereby the system-wide default for the archive ID is stored persistently by the MGS, as it simplifies administration overhead and makes other features such as server failover behave more predictably.</p> LU-3828

Default HSM Archive Identifier is not Persistent

Technical task LU-3647 Blocker Resolved Fixed John Hammond Malcolm Cowe HSM Fri, 23 Aug 2013 03:38:41 +0000 Tue, 1 Oct 2013 14:06:31 +0000 Tue, 1 Oct 2013 14:06:31 +0000 Lustre 2.5.0 Lustre 2.5.0 0 7 <p>Original test case:</p> <blockquote> <p>If I try to change the default archive ID using lctl conf_param instead of lctl set_param, the setting does not change.<br/> Tested as follows:</p> <p>On mount, default archive is set to 1 and archive commands work as expected (when no archive is specified, default is selected automatically).</p> <p>Using lctl set_param to change the default works as expected and lfs hsm_archive command picks up the change.</p> <p>Using lctl hsm_archive with --archive works as expected.</p> <p>lctl conf_param does not work:</p> <p><tt><span class="error">&#91;root@m64-1 /&#93;</span># lctl set_param mdt.scratch-MDT*.hsm.archive_id=2</tt><br/> <tt>mdt.scratch-MDT0000.hsm.archive_id=2</tt><br/> <tt><span class="error">&#91;root@m64-1 /&#93;</span># lctl get_param mdt.scratch-MDT*.hsm.archive_id</tt><br/> <tt>mdt.scratch-MDT0000.hsm.archive_id=2</tt><br/> <tt><span class="error">&#91;root@m64-1 /&#93;</span># lctl conf_param scratch-MDT*.mdt.hsm.archive_id=1</tt><br/> <tt><span class="error">&#91;root@m64-1 /&#93;</span># lctl get_param mdt.scratch-MDT*.hsm.archive_id</tt><br/> <tt>mdt.scratch-MDT0000.hsm.archive_id=2</tt></p> <p>I am assuming that this is the path one should use for conf_param. If I use conf_param the setting does not change.</p></blockquote> <p>This behavior is also true for all HSM tunable (except hsm_control). A solution is to make the proc hsm directory always visible even if HSM is off. If you agree on it I will work on a patch.</p> <p>I agree that the feature is useful and would like to see it implemented. If making the hsm procfs directory visible is a straightforward fix, then it has my support but someone else has to make the call.</p> <p>It is not a "straightforward fix", but the simplest I see. I will work on a patch. Can you validate the other patch, so I will base this new one on the other one (will simplify the review)</p> <p>Patch at <a href="http://review.whamcloud.com/7557" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/7557</a></p> <p>Landed for 2.5.0</p> Development Rank 1|hzvz2f: Rank (Obsolete) 9891