From: jhenders@jonh.wimsey.bc.ca (John Henders) Subject: Re: SCSI Performance (Yet Again) Date: Sun, 22 Aug 1993 15:03:38 GMT
root@hip-hop.suvl.ca.us (Remco Treffkorn) writes:
>Listen, the point here is simply that some people are wondering if the
>SCSI performance is all the way up there *or* if it could be improved.
>Natually they are comparing notes. The problem is only that nobody
>can agree on the correct way to measure performance. Iozone is certainly
>not perfect, but gives you a relative measure if compiled correctly.
Exactly. In my comparisons, I even noted that the numbers I see for
performance under DOS for my Adaptec 1452b are similar, though slightly
higher. I'm curious, not whining. I'd be satisfied with some sort of
explanation, no specificly any promise of improvement. SO far, it seems
to me that the theoretical 5.7 meg/sec of the Adaptec is just that,
theory, and only a few people get even 1 meg/sec.
Again, on my ST, there was a program that bypassed the filesystem
completely to test raw disk i/o, and somehow they even made it
non-destructive so you didn't have to use a clean partition to do tests.
It seems there is no equivalent under *nix.
>Again, nobody (I hope!-) is whining. I am subjectively happy with the
>disk performance, but after having seen some people with IDE presenting
>numbers that beat the sh*t out of my setup with an Adaptec SCSI controller
>I am certainly motivated to look into the matter a bit further.
I'm happy enough with performance, as the filesystem speed of even
the minix filesystem beats the crap out of the FAT based fiesystem on my
ST. news unbatching is probably 10x faster on my linux box than on my
ST. I won't even mention the difference in deletes on 100+ files.
It is a bit mystifying to me that scsi, which I thought was supposed
to be superior to ide, gets lower numbers compared to a similar ide
drive though. I'd really like to see a comparion between 2 of the same
model drive, one scsi, one ide, like the Quantum 105 or a Maxtor.
-- John Henders GO/MU/E d* -p+ c+++ l++ t- m--- s/++ g+ w+++ -x+