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Hello,
<div class="">According to the error msgs, looks like there is a corrupted plain-LLOG file for the ChangeLogs of MDT0. And unfortunately, neither e2fsck nor lfsck can help to recover in this case.</div>
<div class="">I think that to clear this situation you need to stop/umount this MDT and re-mount it as ldiskfs to move both changelog_users and changelog_catalog files to some alternate place/name (do not remove them!), umount ldiskfs, re-start/mount your MDT,
re-run a RBH full-scan, re-register a ChangeLog user.</div>
<div class="">Only side-effect doing so, can be the volume of orphan plain-LLOGs that will be kept consuming space on MDT. You should be able to identify them by running llog_reader tool over the saved/renamed old catalog file that will list you the references
to all these remaining plain-LLOGs, allowing you to find+remove them during a new ldiskfs-mount session.</div>
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<div class="">Bruno.</div>
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<blockquote type="cite" class="">
<div class="">On Jun 1, 2017, at 4:09 PM, Gibbins, Faye <<a href="mailto:Faye.Gibbins@cirrus.com" class="">Faye.Gibbins@cirrus.com</a>> wrote:</div>
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Hi,<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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We have 4 file systems on our lustre cluster. All have changelog users registered for robinhood to use.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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We have discovered that a changelog user for one of the file systems is not catching up to its index. Manual runs of Robinhood fail to read any more records even though according to mdd/tools-MDT0000/changelog_users there are record to read!<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Over time the change log had filled and the file system had become sluggish. Wiping the robinhood mysql and reinitializing robin hood with a full scan didn’t fix the issue and like I said above three other change logs from different file systems (on the same
MSG) are ok when used from the same robinhood instance.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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What makes me think this is a lustre (and we are using 2.8 on ext4) problem is this (repeated) error we are getting in syslog:<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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[Wed May 31 14:06:59 2017] Lustre: 46400:0:(llog.c:530:llog_process_thread()) invalid length -420090294 in llog record for index 372672342/61708<o:p class=""></o:p></div>
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[Wed May 31 14:06:59 2017] LustreError: 46400:0:(mdd_device.c:261:llog_changelog_cancel()) tools-MDD0000: cancel idx 645 of catalog 0x7:10 rc=-22<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Deregistering the user from the change log and starting with a new one has not changed the behaviour and we still can’t use this new user to track changes to the file system.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Can anyone offer any advice on how to resolve this issue in the changelog?<o:p class=""></o:p></div>
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If not can anyone confirm if taking the file system down for a e2fsck/lfsck will fix issues with the changelog? I’d settle for being able to clear the whole log and starting afresh if that’s possible?<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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<span class="">Yours<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span class="">Faye Gibbins<o:p class=""></o:p></span></div>
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<span style="font-size: 9pt; color: rgb(156, 194, 229);" class="">Snr SysAdmin, Unix Lead Architect<o:p class=""></o:p></span></div>
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<span style="font-size: 9pt; color: rgb(156, 194, 229);" class="">Software Systems and Cloud Services<o:p class=""></o:p></span></div>
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