I get really bad performance with the PERC2-SC (single channel)
controller,
using the Bonnie benchmark.
In fact a Pentium with 64 Mbytes and an IDE controller with a singel
disk
outperforms the measured computer in all categories except seeks per
second.
I suspect that something is broken in the kernel buffer/cache handling.
Does anyone have any tuning suggestions?
Or is it the controller/controller driver that is broken?
Suggestions on how to get the disk system up to speed are most welcome.
---------
Bonnie output:
File '/u03/Bonnie.19321', size: 2097152000
Writing with putc()...done
Rewriting...done
Writing intelligently...done
Reading with getc()...done
Reading intelligently...done
Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done...
-------Sequential Output-------- ---Sequential Input--
--Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block---
--Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU
/sec %CPU
DELL 2000 1637 26.5 1623 1.8 1418 3.4 5899 88.8 12961 15.1
76.0 2.6
------
System:
Stock Redhat 6.0
Dell Poweredge 2300, 2xPII 400
512 MByte.
5x9GB Seagate UW2 disks in RAID5 array on an PERC2-SC controller with 16
MByte memory.
64 kByte strip size.
