On 15/06/16 13:18, Christian Balzer wrote:
"osd_scrub_min_interval": "86400",
"osd_scrub_max_interval": "604800",
"osd_scrub_interval_randomize_ratio": "0.5",
Latest Hammer and afterwards can randomize things (spreading the load out),
but if you want things to happen within a certain time frame this might
not be helpful.
We are on Hammer (0.94.7) and have osd_scrub_interval_randomize_ratio
set - it does not appear to be helping much. E.g here are our deep scrub
dates aggregated by day for one region:
Day num total size
------------------------------
2016-07-19 511 5357167224372
2016-07-20 2129 9325996976904
2016-07-21 81 10544023951
2016-07-22 9 5754126355
2016-07-25 21 0
2016-07-26 1 13
2016-07-27 19 0
2016-08-01 52 0
2016-08-05 1 0
2016-08-08 6 0
2016-08-10 230 711935323538
2016-08-11 1211 5190285214797
2016-08-12 1543 1900998763365
2016-08-13 20 41687250384
2016-08-14 26 61185603382
2016-08-15 647 1963297626685
2016-08-16 2133 8354221242053
------------------------------
Totals 8640 32824222245266
We have the deep scrub interval set to 4 weeks but only 17 days are used
for deep scrubbing, and clearly the workload is quite uneven due to the
distribution. I am attacking these two issues with a pre-emptive deep
scrubbing script that we will run nightly.
It would be cool to have a command or api to alter/set the last deep
scrub timestamp - as it seems to me that the only way to change the
distribution of deep scrubs is to perform deep scrubs...
regards
Mark
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