It was sequential using a modified Bonnie benchmark with multiple
processes running (though I was getting around the same performance
using the raw device using a program I wrote). I was writing 10GB
files to each device, so that should get rid of any cache usage. This
is on an ES40 (Quad 500MHz 21264 Alphas) with the 64bit 66MHz PCI bus.
The drives are 10K RPM Seagate Cheetahs in a 4 data + parity RAID 5
configuration. The reason I am using a sequential test is I'm
interested in seeing what I can expect for maximum throughput.
BAPper
On Wed, Mar 08, 2000 at 11:45:39AM -0000, Matthew Clark wrote:
> Under what circumstances are you "only" achieving 26MB/s - what file size?
> was it random or sequential?
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of Brian Pomerantz
> > Sent: 08 March 2000 05:07
> > To: [EMAIL PROTECTED]
> > Subject: Re: Benchmarking.. how can I get more out of my box?
> >
> >
> > Well, I know I'm not getting the performance I want out of the Mylex
> > DAC1164P. I was only getting 26MB/s on write throughput with 2 RAID 5
> > chains (5+p). I'm certain that either the card is not optimized, the
> > driver is not optimized, or both. One of the things that we have
> > found here at LLNL is that there MUST be synchronization between the
> > firmware on the controller, the driver, the host OS VFS layer, and the
> > file system.
