[lustre-discuss] ?==?utf-8?q? ?==?utf-8?q? ?= Changelog users failing to clear records in 2.8, can anyone help

nanava@luis.uni-hannover.de nanava at luis.uni-hannover.de
Mon Jan 7 10:39:51 PST 2019

Any advice here what could be done to avoid storage overflow?. As only a few gb is left on mdt, we plan to resize the storage  device, though this seems to be not a permanent solution ..

Thank you.

> has this problem been resolved? We experience the same issue when we can't clear the changelog records and as a result MDT is gradually running out of space.
> Will update to 2.10.x on MDS resolve the issue ?
> Thanks.
> Regards
> -----
> Gizo Nanava
> Leibniz Universitaet IT Services
> Leibniz Universitaet Hannover
> Schlosswender Str. 5
> D-30159 Hannover
> Tel +49 511 762 7919085
> http://www.luis.uni-hannover.de
> On Thursday, June 1, 2017 16:09 CEST, "Gibbins, Faye" <Faye.Gibbins at cirrus.com> wrote: 
> > Hi,
> > 
> > We have 4 file systems on our lustre cluster. All have changelog users registered for robinhood to use.
> > 
> > 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!
> > 
> > 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.
> > 
> > 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:
> > 
> > [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
> > [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
> > 
> > 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.
> > 
> > Can anyone offer any advice on how to resolve this issue in the changelog?
> > 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?
> > 
> > Yours
> > Faye Gibbins
> > Snr SysAdmin, Unix Lead Architect
> > Software Systems and Cloud Services
> > Cirrus Logic | cirrus.com<http://www.cirrus.com/>  | +44 (0) 131 272 7398
> > 
> > [cid:image002.png at 01D2CF24.9A35B8F0]
> > 
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Dr. Gizo Nanava
Leibniz Universitaet IT Services
Leibniz Universitaet Hannover
Schlosswender Str. 5
D-30159 Hannover
Tel +49 511 762 7919085

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