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On 10/01/18 21:53, Josef Zelenka wrote:
Hi, i had the same issue a few days back, i tried playing
around with these two:
ceph tell 'osd.*' injectargs '--osd-max-backfills <num>'
ceph tell 'osd.*' injectargs '--osd-recovery-max-active <num> '
and it helped greatly(increased our recovery speed 20x), but be careful to not overload your systems.
On 10/01/18 17:50, shadow_lin wrote:
Hi all,
I am playing with setting for
backfill to try to find how to control the speed of
backfill.
Now I only find "osd max
backfills" can have effect the backfill speed. But after all
pg need to be backfilled begin backfilling I can't find any
way to speed up backfills.
Especailly when it comes to the
last pg to recover, the speed is only a few MB/s(when there
are multi pg are backfilled the speed could be more than
600MB/s in my test)
I am a little confused about the
setting of backfills and recovery.Though backfilling is a
kind of recovery but It seems recovery setting is only about
to replay pg logs to do recover pg.
Would change "osd recovery max
active" or other recovery setting have any effect on
backfilling?
I did tried "osd recovery op
priority" and "osd recovery max active" with no luck.
Any advice would be greatly
appreciated.Thanks
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