All,

I have been observing for a while now a difference between how full 
robinhood believes our filesystem is and how full lfs df -h reports it is.

I am wondering if anyone has any insight into this.

A bit of history... I run frequent reports against the robinhood 
database, which also include the output of the lfs df -h command. 
Historically, the total based on rbh-du and lfs df were essentially 
identical. Lately, they seem to keep growing apart--what seems to bring 
them back together is doing a full scan of the file system. As time 
passes after a scan (changelogs are on), the 'lfs df' command reports 
that usage is more and more full than rbh-du says it is.

Indeed, I recently reinstalled (upgraded) my robinhood and noticed that 
when the report ran precisely after the filescan and before the service 
was activated (so no changelogs were being consumed) the difference was 
precisely zero. I believe that is a clue... but I don't know why this is 
happening (when there was a lengthy period where it wasn't happening) or 
what to do to fix it.

Also, it might help to know that there is a non-negligible amount of 
moving files from one OST to another taking place.

Thanks,
Jessica

-- 
Jessica Otey
System Administrator II
North American ALMA Science Center (NAASC)
National Radio Astronomy Observatory (NRAO)
Charlottesville, Virginia (USA)


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