...
Of more interest would be a test which involved large files with lots
of seeks all around (something like bonnie++ should do that).
...
Here's the bonnie++ numbers for the RAID 5 x 6 disks. I believe this was
with write-through and 64k striping. I plan to run a few others with
different block sizes and larger files- I'd be happy to send out a link
to the list when I get a chance to post them somewhere. I've also been
running some basic tests with pgbench just to help jumpstart customizing
postgresql.conf, so that might be of interest too.
bash-2.05b$ bonnie++ -d bonnie -s 1000:8k
Version 1.93c ------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
1000M 587 99 246900 71 225124 76 1000 99 585723 99
8573 955
Latency 14367us 50829us 410ms 57965us 1656us
432ms
Version 1.93c ------Sequential Create------ --------Random
Create--------
-Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP
16 28192 91 +++++ +++ +++++ +++ 26076 89 +++++ +++
+++++ +++
Latency 25988us 75us 37us 24756us 36us
41us
1.93c,1.93c,
,1,1155223901,1000M,,587,99,246900,71,225124,76,1000,99,585723,99,8573,9
55,16,,,,,28192,91,+++++,+++,+++++,+++,26076,89,+++++,+++,+++++,+++,1436
7us,50829us,410ms,57965us,1656us,432ms,25988us,75us,37us,24756us,36us,41
us
...
Thanks for sharing your numbers.
...
You're welcome- I prefer to see actual numbers rather than people simply
stating that RAID controller X is better, so hopefully more people will
do the same.
- Bucky