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-6713 Lustre <p>Seen on Lustre 2.7.0.</p> <p>While create a 128 MDT filesystem, I noticed that clients sometimes take a long time to connect to new MDTs after they've been added. I saw a lot of these messages on a client's console:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>Jun 12 00:08:13 client00 kernel: LustreError: 1275:0:(fld_request.c:170:fld_client_add_target()) Skipped 12 previous similar messages Jun 12 00:08:13 client00 kernel: Lustre: 1275:0:(lmv_obd.c:300:lmv_init_ea_size()) scratch-clilmv-ffff880772a0ec00: NULL export for 11 Jun 12 00:08:13 client00 kernel: Lustre: 1275:0:(lmv_obd.c:300:lmv_init_ea_size()) Skipped 462 previous similar messages Jun 12 00:08:19 client00 kernel: LustreError: 1277:0:(fld_request.c:170:fld_client_add_target()) cli-scratch-clilmv-ffff880772a0ec00: Attempt to add target scratch-MDT0025-mdc-ffff880772a0ec00 (idx 37) on fly - skip it Jun 12 00:08:19 client00 kernel: LustreError: 1277:0:(fld_request.c:170:fld_client_add_target()) Skipped 13 previous similar messages Jun 12 00:08:19 client00 kernel: Lustre: 1277:0:(lmv_obd.c:300:lmv_init_ea_size()) scratch-clilmv-ffff880772a0ec00: NULL export for 12 Jun 12 00:08:19 client00 kernel: Lustre: 1277:0:(lmv_obd.c:300:lmv_init_ea_size()) Skipped 258 previous similar messages Jun 12 00:08:25 client00 kernel: Lustre: 1278:0:(lmv_obd.c:300:lmv_init_ea_size()) scratch-clilmv-ffff880772a0ec00: NULL export for 13 Jun 12 00:08:25 client00 kernel: Lustre: 1278:0:(lmv_obd.c:300:lmv_init_ea_size()) Skipped 56 previous similar messages Jun 12 00:08:25 client00 kernel: LustreError: 1278:0:(fld_request.c:170:fld_client_add_target()) cli-scratch-clilmv-ffff880772a0ec00: Attempt to add target scratch-MDT0027-mdc-ffff880772a0ec00 (idx 39) on fly - skip it Jun 12 00:08:25 client00 kernel: LustreError: 1278:0:(fld_request.c:170:fld_client_add_target()) Skipped 8 previous similar messages </pre> </div></div> <p>Eventually the client did connect to all the MDTs, but took about ~20 minutes. </p> LU-6713

Noisy error messages on client while creating DNE filesystem

Bug Major Resolved Fixed Di Wang Robert Read Fri, 12 Jun 2015 01:17:58 +0000 Fri, 1 Jul 2016 18:51:26 +0000 Tue, 28 Jul 2015 13:00:21 +0000 Lustre 2.7.0 Lustre 2.8.0 Lustre 2.8.0 0 7 <p>We saw some what is likely a related problem during performance testing. If "lfs mkdir -c" is used to create striped directories right after mount (before the MDSes all connect to each other), then the striped directories will have too few stripes.</p> <p>It would be interesting to get a debug log from the client and one of the MDSes, if possible, to see where it is spending so much time. Even with the MDSes creating 128*128=65536 connections between themselves, that shouldn't be more than a few seconds of RPCs. </p> <p>wangdi (di.wang@intel.com) uploaded a new patch: <a href="http://review.whamcloud.com/15269" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/15269</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-6713" title="Noisy error messages on client while creating DNE filesystem" class="issue-link" data-issue-key="LU-6713"><del>LU-6713</del></a> lmv: lock necessary part of lmv_add_target<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: e04b00e82d25202950380d7cc2b31db9aff7d27a</p> <p>This slowness might because lmv-&gt;lmv_init_mutex cover too much area in lmv_add_target. I just shrink the protection area of lmv_add_target(). see above patch.</p> <p>Oleg Drokin (oleg.drokin@intel.com) merged in patch <a href="http://review.whamcloud.com/15269/" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/15269/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-6713" title="Noisy error messages on client while creating DNE filesystem" class="issue-link" data-issue-key="LU-6713"><del>LU-6713</del></a> lmv: lock necessary part of lmv_add_target<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: 1670c57315340db997c9058950148a05634f43f1</p> <p>Landed for 2.8</p> Development Rank 1|hzxflz: Rank (Obsolete) 9223372036854775807 Severity