>>>>> "Kent" == Kent Nilsen <[EMAIL PROTECTED]> writes:
Kent> I've got exactly the same problem on a Mylex hardware RAID-
Kent> controller, writing is nearly twice as fast as reading. The
Kent> drives are Barracuda 50Gb drives, the controller is a
Kent> DAC1164P. I use the latest firmware, and latest drivers from
Kent> dandelion.com. Kernel version is 2.2.14, distribution=Mandrake
Kent> 7.0. Single PIII-600 on dual motherboard (Asus P2B-DS), 392 Mb
Kent> RAM.
Kent> Do you by any chance have problems with the entire system
Kent> freezing after a while or during lots of activity? I've got that
Kent> problem, though my firmware should be a fixed version.
Funny (or not), this sounds a lot like my current problems.
I have a HP Netserver LH4 with integrated HP Netraid controller. When
doing heavy I/O on the Netraid controller the entire system more or
less freezes. I am using newet firmware version (have even tried a
few older versions), and have tried it on 2.2.14 and 2.2.15pre14.
Doing bonnie on a single 9GB HP disk shows the following:
-------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
100 7771 99.5 6753 3.8 4513 9.2 7830 99.6 245756 100.8 22572.5 95.9
That is approx. 4 times faster on block read than block write, but
100% cpu load on block read!!
I was coming to the conclusion that I had to look deep into the AMI
Megaraid driver to try and locate the problem, but could the problem
by chance be more generic ?
Can anyone offer some qualified guidance about where to start look for
this problem ?
/bart
