Re: yet another deep-scrub performance topic

[Caspar Smit <casparsmit@xxxxxxxxxxx>]

On a Luminous 12.2.7 cluster these are the defaults:

ceph daemon osd.x config show

   "osd_scrub_max_interval": "604800.000000",
   "osd_scrub_min_interval": "86400.000000",
   "osd_scrub_interval_randomize_ratio": "0.500000",
   "osd_scrub_chunk_max": "25",
   "osd_scrub_chunk_min": "5",
   "osd_scrub_priority": "5",
   "osd_scrub_sleep": "0.000000",
   "osd_deep_scrub_interval": "604800.000000",
   "osd_deep_scrub_stride": "524288",
   "osd_disk_thread_ioprio_class": "",
   "osd_disk_thread_ioprio_priority": "-1",

You can check your differences with the defaults using:

ceph daemon osd.x config diff

Kind regards,
Caspar

Op di 11 dec. 2018 om 12:36 schreef Janne Johansson <icepic.dz@xxxxxxxxx>:

Den tis 11 dec. 2018 kl 12:26 skrev Caspar Smit <casparsmit@xxxxxxxxxxx>:
>
> Furthermore, presuming you are running Jewel or Luminous you can change some settings in ceph.conf to mitigate the deep-scrub impact:
>
> osd scrub max interval = 4838400
> osd scrub min interval = 2419200
> osd scrub interval randomize ratio = 1.0
> osd scrub chunk max = 1
> osd scrub chunk min = 1
> osd scrub priority = 1
> osd scrub sleep = 0.1
> osd deep scrub interval = 2419200
> osd deep scrub stride = 1048576
> osd disk thread ioprio class = idle
> osd disk thread ioprio priority = 7
>

It would be interesting to see what the defaults for those were, so
one can see which go up and which go down.

--
May the most significant bit of your life be positive.

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