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Hi ,
Mine is purely backfilling(remove a osd from the
cluster) and it started at 600Mb/s and ended at about 3MB/s.
How is your recovery made up?Is it backfill or log
replay pg recovery or both?
2018-01-11
shadow_lin
发件人：Josef Zelenka
<josef.zelenka@xxxxxxxxxxxxxxxx>
发送时间：2018-01-11 15:26
主题：Re: [ceph-users] How to speed up backfill
收件人："shadow_lin"<shadow_lin@xxxxxxx>
抄送："ceph-users"<ceph-users@xxxxxxxxxxxxxx>
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: [ceph-users] 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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