I've seen a lot of cases where enabling compression helps with systems
that are disk-bound. If you've got extra CPU ... give it a shot.
On 1/18/2011 10:11 AM, Michael Armstrong wrote:
I've since turned off dedup, added another 3 drives and results have improved
to around 148388K/sec on average, would turning on compression make things more
CPU bound and improve performance further?
On 18 Jan 2011, at 15:07, Richard Elling wrote:
On Jan 15, 2011, at 4:21 PM, Michael Armstrong wrote:
Hi guys, sorry in advance if this is somewhat a lowly question, I've recently
built a zfs test box based on nexentastor with 4x samsung 2tb drives connected
via SATA-II in a raidz1 configuration with dedup enabled compression off and
pool version 23. From running bonnie++ I get the following results:
Version 1.03b ------Sequential Output------ --Sequential Input- --Random-
-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
nexentastor 4G 60582 54 20502 4 12385 3 53901 57 105290 10 429.8 1
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 7181 29 +++++ +++ +++++ +++ 21477 97 +++++ +++ +++++ +++
nexentastor,4G,60582,54,20502,4,12385,3,53901,57,105290,10,429.8,1,16,7181,29,+++++,+++,+++++,+++,21477,97,+++++,+++,+++++,+++
I'd expect more than 105290K/s on a sequential read as a peak for a single
drive, let alone a striped set. The system has a relatively decent CPU, however
only 2GB memory, do you think increasing this to 4GB would noticeably affect
performance of my zpool? The memory is only DDR1.
2GB or 4GB of RAM + dedup is a recipe for pain. Do yourself a favor, turn off
dedup
and enable compression.
-- richard
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