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-10843 Lustre <p>If the MGS is unmounted and remount (or failed over) <tt>lctl snapshot_create</tt> fails with the following error:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre># lctl snapshot_create -F scratch -n test Fail to freeze barrier for scratch: No such device Can't create the snapshot test </pre> </div></div> <p>snapshot_destroy still works without issue.</p> <p><b>WORKAROUND:</b> unmount/mount the MDT and <tt>snapshot_create</tt> will commence working again.</p> <p><b>NOTE:</b> <tt>mount -o remount</tt> is insufficient</p> LU-10843

snapshot_create fails after MGS restart

Bug Major Resolved Fixed Nathaniel Clark Nathaniel Clark Fri, 23 Mar 2018 13:14:38 +0000 Mon, 13 Feb 2023 02:30:56 +0000 Thu, 17 May 2018 03:05:01 +0000 Lustre 2.10.3 Lustre 2.12.0 Lustre 2.10.5 0 5 <p>After remount of MGS <tt>FSNAME-barrier</tt> is missing from <tt>mgs-&gt;mgs_fs_db_list</tt>. It is only added during <tt>mgs_handler.c::mgs_target_reg()</tt></p> <p>Nathaniel Clark (nathaniel.l.clark@intel.com) uploaded a new patch: <a href="https://review.whamcloud.com/31779" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/31779</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-10843" title="snapshot_create fails after MGS restart" class="issue-link" data-issue-key="LU-10843"><del>LU-10843</del></a> mgs: allow snapshot after MGS remount<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: d4487c2e5cdc8ac4e0f16b29e9bd05ee3bd60edb</p> <p>In debugging <a href="https://review.whamcloud.com/31779" class="external-link" target="_blank" rel="nofollow noopener">#31779</a> I used wireshare to figure out when the MGS actually started accepting barrier commands and to that end, I've added barrier parsing to wireshark: </p> <p><a href="https://code.wireshark.org/review/#/c/26692/" class="external-link" target="_blank" rel="nofollow noopener">https://code.wireshark.org/review/#/c/26692/</a></p> <p>Oleg Drokin (oleg.drokin@intel.com) merged in patch <a href="https://review.whamcloud.com/31779/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/31779/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-10843" title="snapshot_create fails after MGS restart" class="issue-link" data-issue-key="LU-10843"><del>LU-10843</del></a> mgs: allow snapshot after MGS remount<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: 2d63d5bc74a5b2477d795bf9e9b0eba94f7fc19f</p> <p>Landed for 2.12</p> <p>Minh Diep (minh.diep@intel.com) uploaded a new patch: <a href="https://review.whamcloud.com/32519" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/32519</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-10843" title="snapshot_create fails after MGS restart" class="issue-link" data-issue-key="LU-10843"><del>LU-10843</del></a> mgs: allow snapshot after MGS remount<br/> Project: fs/lustre-release<br/> Branch: b2_10<br/> Current Patch Set: 1<br/> Commit: 02c6dc424eea35cb79840f2dd1144543a502ccd9</p> <p>John L. Hammond (jhammond@whamcloud.com) merged in patch <a href="https://review.whamcloud.com/32519/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/32519/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-10843" title="snapshot_create fails after MGS restart" class="issue-link" data-issue-key="LU-10843"><del>LU-10843</del></a> mgs: allow snapshot after MGS remount<br/> Project: fs/lustre-release<br/> Branch: b2_10<br/> Current Patch Set: <br/> Commit: f01f2174bcc27c06c8cd5e64cb6e63452fe6c07b</p> Duplicate Related Development Rank 1|hzzuq7: Rank (Obsolete) 9223372036854775807 Severity