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
2018-01-11
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lin.yunfan
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