Date: Fri, 20 Aug 2010 12:30:07 +0200 From: Heinrich Rebehn <rebehn@ant.uni-bremen.de> To: freebsd-stable@freebsd.org Subject: ZFS performance question Message-ID: <EDFF110C-91D3-40DA-A581-9885EAAE3753@ant.uni-bremen.de>
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Hi all,
After setting up our new server (Intel Q9550 CPU, 8GB RAM, 4 x =
ST31000340NS) i did a bonnie++ benchmark on the zfs raidz that i created =
on 4 partitions on the 4 disks.
root@antsrv4 [/data/nocompression] # bonnie++ -u root -d .
Using uid:0, gid:0.
Writing a byte at a time...done
Writing intelligently...done
Rewriting...done
Reading a byte at a time...done
Reading intelligently...done
start 'em...done...done...done...done...done...
Create files in sequential order...done.
Stat files in sequential order...done.
Delete files in sequential order...done.
Create files in random order...done.
Stat files in random order...done.
Delete files in random order...done.
Version 1.96 ------Sequential Output------ --Sequential Input- =
--Random-
Concurrency 1 -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
antsrv4.ant.uni 16G 94 81 151823 39 100780 27 303 99 239853 30 =
148.3 4
Latency 4733ms 6051ms 8173ms 37504us 917ms =
1030ms
Version 1.96 ------Sequential Create------ --------Random =
Create--------
antsrv4.ant.uni-bre -Create-- --Read--- -Delete-- -Create-- --Read--- =
-Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP =
/sec %CP
16 24183 97 +++++ +++ 21715 98 17209 98 +++++ +++ =
21291 97
Latency 19779us 128us 162us 39671us 38us =
77us
=
1.96,1.96,antsrv4.ant.uni-bremen.de,1,1282303232,16G,,94,81,151823,39,1007=
80,27,303,99,239853,30,148.3,4,16,,,,,24183,97,+++++,+++,21715,98,17209,98=
,+++++,+++,21291,97, =
733ms,6051ms,8173ms,37504us,917ms,1030ms,19779us,128us,162us,39671us,38us,=
77us
I am somewhat concerned about the numbers for per-char-output and =
per-char-input. In fact, i have never before seen that low numbers in a =
bonnie test. Using a single disk with UFS yields about 6 times as much.
I know that this is not crucial for a normal file server, but i want to =
rule out any configuration errors.
Is this normal for ZFS?. Disks are accessed using ahci. I did not =
attempt any tuning yet.
BTW: Running OpenSolaris on the same hardware yields 110306 for =
per-char-write and 94698 for per-char-read.
--Heinrich
Heinrich Rebehn
University of Bremen
Physics / Electrical and Electronics Engineering
- Department of Telecommunications -
Phone : +49/421/218-62394
Fax : -3341
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