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Hi, our recovery slowed down significantly towards the end,
however it was still about five times faster than the original
speed.We suspected that this is caused somehow by threading (more
objects transferred - more threads used), but this is only an
assumption.
On 11/01/18 05:02, shadow_lin wrote:
Hi,
I had tried these two method and for
backfilling it seems only osd-max-backfills works.
How was your recovery speed when it
comes to the last few pgs or objects?
2018-01-11
shadow_lin
发送时间：2018-01-11 04:53
主题：Re: How to speed up
backfill
抄送：
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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