[Bug 237807] ZFS: ZVOL writes fast, ZVOL reads abysmal...
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Fri Aug 9 13:23:03 UTC 2019
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237807
--- Comment #11 from Nils Beyer <nbe at renzel.net> ---
increasing concurrency doesn't help:
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Version 1.97 ------Sequential Output------ --Sequential Input- --Random-
Concurrency 16 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
veeambackups 64G 156 99 496023 58 117847 21 5 8 40116 8 942.0 17
Latency 54528us 315ms 293ms 1579ms 81741us 74544us
Version 1.97 ------Sequential Create------ --------Random Create--------
veeambackups -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ 16878 56 +++++ +++ +++++ +++ 31661 99
Latency 2501us 43us 423ms 2225us 38us 91us
1.97,1.97,veeambackups,16,1565363711,64G,,156,99,496023,58,117847,21,5,8,40116,8,942.0,17,16,,,,,+++++,+++,+++++,+++,16878,56,+++++,+++,+++++,+++,31661,99,54528us,315ms,293ms,1579ms,81741us,74544us,2501us,43us,423ms,2225us,38us,91us
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