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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We have 4 file systems on our lustre cluster. All have changelog users registered for robinhood to use.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">[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></o:p></p>
<p class="MsoNormal">[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></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can anyone offer any advice on how to resolve this issue in the changelog?<o:p></o:p></p>
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal">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></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Yours<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Faye Gibbins<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:#9CC2E5;mso-fareast-language:EN-GB">Snr SysAdmin, Unix Lead Architect<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:#9CC2E5;mso-fareast-language:EN-GB">Software Systems and Cloud Services<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;color:#9CC2E5;mso-fareast-language:EN-GB">Cirrus Logic | <a href="http://www.cirrus.com/"><span style="color:#9CC2E5">cirrus.com</span></a> | +44 (0) 131 272 7398</span><span style="font-size:9.0pt;color:#9CC2E5;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><img border="0" width="439" height="117" style="width:4.5729in;height:1.2187in" id="Picture_x005f_x0020_1" src="cid:image001.png@01D2DAE7.BAD5CCC0" alt="cid:image002.png@01D2CF24.9A35B8F0"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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