Re: Tuning Linux for high-speed disk subsystems

Ragnar Kjørstad (kernel@ragnark.vestdata.no)
Tue, 13 Nov 2001 17:43:26 +0100

On Tue, Nov 13, 2001 at 03:29:13PM +0100, Roy Sigurd Karlsbakk wrote:
> After some testing at Compaq's lab in Oslo, I've come to the conclusion
> that Linux cannot scale higher than about 30-40MB/sec in or out of a
> hardware or software RAID-0 set with several stripe/chunk sizes tried out.

Eh, we do 60-70 MB/s reads and 110-120 MB/s writes on our RAIDs... from
linux.

> Does anyone know this stuff good enough to help me how to tune the system?
> PS: The CPUs were almost idle during the test. Tested file system was
> ext2.

I'd say you should get rid of your compaq raid controller and use a
regular SCSI-controller - 66Mhz 64 bit. (e.g. an adaptec)

-- 
Ragnar Kjørstad
Big Storage
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