Subject: Re: ATAPI UltraDMA questions...
To: None <firstname.lastname@example.org>
From: Wolfgang Rupprecht <email@example.com>
Date: 02/28/2001 10:45:13
> > Are there any *reliable* benchmarking tools to check
> > performance of disks too?
> dd if=/dev/rwd0d of=/dev/null ns=64k count=8192
> > I'm currently investigating these as alternatives
> > to SCSI disks as they are half the cost and they
> > are almost as fast.
> half?! 1/4 costs!!!!
I think the raw performance of IDE is quite good (especially if you
only put one disk on a cable). The IBM DTLA-307075 (an IDE drive)
reads at 36.4 MBytes/sec.
# dd if=/dev/rwd1d of=/dev/null bs=64k count=40000
40000+0 records in
40000+0 records out
2621440000 bytes transferred in 72 secs (36408888 bytes/sec)
Thats not that shabby...
The one caveat is that all current drives are zoned, meaning that they
are faster on the outer (low-numbered) tracks than the inner ones.
The above IBM slows down by a factor of ~2 on the inner tracks.
Wolfgang Rupprecht <firstname.lastname@example.org>
Coming soon: GPS mapping tools for Open Systems. http://www.gnomad-mapping.com/