Hi,

I get the suspicion that reading / acknowledging changelog entries got stuck on 
our Lustre 2.5.3 with Robinhood 2.5.3 doing the reading.
First indication: some now well-filled directories are continously reported by 
rbh-du with a few kbytes, lfs quota reports values quite different from 
rbh-reports.

On the MDS, there is a rather large gap in the record ids:

cat /proc/fs/lustre/mdd/nyx-MDT0000/changelog_users
current index: 2727922031
ID    index
cl2   2501225908

and the log of Robinhood reports a

2016/07/17 01:18:25 rbh-lhsm@lxrbh1[19653/1] STATS |   last read record time    
= 2016/06/28 11:32:34.623897

which is actually changing - but very slowly.

Or rather than being stuck, is this a symptom of Robinhood having a hard time 
working on the > 200 million records it seems to have missed?
(There were several interruptions and crashes during the last weeks...)


I also have the warning
  WARNING: more than 1 MDT changelog reader, only 1st reader stats will be 
stored in DB

Of course, the other changelog reader are nowhere to be seen. There are two 
MDTs, each has its own changelog "consumer". The few files on the 
secondary MDT are properly recorded by Robinhood, though. So these are not the 
additional "readers" the warning talks about.

Regards,
Thomas




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Thomas Roth
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