> On Mon, 7 Dec 1998, C S Hendrix wrote:
>
> > Regarding DPT controllers: really, they aren't that great. I like
> > them, and a lot of people told me before I got it that it was the
> > best thing since sliced bread. Easy to program, and very fast.
> > But I've been somewhat disappointed in the speed. Granted I only
>
> What kind of speed are you getting? What dos "hdparm -t" say when you do it
> on your DPT?
Well, I never really trusted hdparm, but I get this on the first
wide scsi drive:
/dev/sda:
Timing buffered disk reads: 32 MB in 6.87 seconds = 4.66 MB/sec
A couple of minutes ago I got 5.25 MB/sec for the same drive.
The RAID devices I have get just about identical values from hdparm.
I question what use it is for testing my SCSI system because
I believe a simple large I/O benchmark (time copying a gig or
something) shows the drives to be faster than hdparm.
Lemme check...
OK, 431318 Kbytes in 4 minutes, 35 seconds.
That is about 1.5MB/sec, to and from the same md device.
Technically you double that to get throughput since it was reading
and writing that chunk of data.
I personally think this system should be faster than that. It is
a DPT 2044W, dual PPro running Linux 2.1.124, Dario's DPT driver
with all the performance goodies checked, and dual Seagate Hawk
fast-wide SCSI drives. I know those drives aren't the fastest
around, but they aren't terrible either.
-- Shannon - shendrix@widomaker.com - www.widomaker.com/~shendrix/myresume.html ---------------------------------------------------------------------- "When you say 'I wrote a program that crashed Windows', people just stare at you blankly and say 'Hey, I got those with the system, *for free*'." -- Linus Torvalds
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