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Hello,

> People keep pushing SCSI disks in Ultra 5 and 10s, but, are they
> really faster?

Yes ( 40MB/s or more vs. about 16MB/s )

> My ultra 10 with some random (and I do mean random) cheap ide disk is 
> faster doing disk i/o then almost anything else I have at home and 
> competitive with the faster (cpu wise) ultra 2 with very fast scsi 
> disks.  Would it be all that much faster if I had
> scsi disks then?

The reason to push for SCSI isn't only speed - the onboard IDE chip 
just plain sucks. It only does PIO4 with DMA which maxes out at 16MB/s, 
no such things as checksums or anything to protect transfers ( UDMA33 
and up added these ) and IDE ( at least this variant of IDE ) has a 
tendency to suck CPU cycles while SCSI controllers tend to be more 
intelligent on their own.

The other reason is that the U10 firmware supports some SymBIOS chips 
natively so almost any garden variety 53C8xx card should be bootable - 
can't be said about faster IDE or SATA cards . These would work in 
NetBSD though.

have fun
Michael
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