On Fri, 30 Jul 2004 at 7:53pm, Jim Buttafuoco wrote
> I second Marks comment on NOT recommending the 3ware cards to anyone.
>
> I have a dual XEON 3.2 Ghz system 12 G of ram with a 3ware 8506-8 in it (8 250 G drives). The hard raid performance
> was very bad. with the load avg going over 40. I then switched over to JBOD and software raid. The IO wait times
> are really high and the performance sucks. Very hard to explain to my boss where the $20k went. The system is a
> database server (postgres). I tried both kernel 2.4 and 2.6 with the same problem. I am now in the process of
> testing the adaptec raid controller.
3wares *can* work, and work well. I've got two 7500-8s on a dual Xeon
board (Supermicro), each with 8 180GB WD drives (7200 RPM) and running
hardware RAID5. Then I do a software RAID0 strips across the two arrays.
Performance is quite good:
[jlb@buckbeak jlb]$ bonnie++ -s 8192
Version 1.02c ------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
buckbeak 8G 25283 96 131142 39 83869 32 28038 99 342849 68 444.1 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 2644 21 +++++ +++ 2227 17 2548 20 +++++ +++ 2118 21
buckbeak,8G,25283,96,131142,39,83869,32,28038,99,342849,68,444.1,1,16,2644,21,+++++,+++,2227,17,2548,20,+++++,+++,2118,21
That's with a 2.4 kernel and XFS.
--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
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