Michael Herf wrote:
I have also had slow scrubbing on filesystems with lots of files, and I
agree that it does seem to degrade badly. For me, it seemed to go from
24 hours to 72 hours in a matter of a few weeks.
I did these things on a pool in-place, which helped a lot (no rebuilding):
2. disabled compression and rebuilt affected datasets (is compression on?)
That one shouldn't have made any difference because if the data is only
being read for the purposes of a scrub it won't be uncompressed.
What probably made more difference was the fact that you "rebuild" some
datasets and if you didn't export the pool those would now all possibly
be hot in the ARC.
--
Darren J Moffat
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