Re: scsi disk question: u2w vs. uw
Sorry, but this is rubbish! The SCSI controller will have no effect on the
disk rotational velocity. However this is not what the poster asked! If
you put an Ultra 2 wide on a non wide channel the transfers will be eight
bits at a time instead of 16, i.e. half the speed, but it will work
fine. Some cards like the AHA2940UW have a wide and a narrow channel, if
the Ultra wide disk is put on the UW channel and the Ultra disk is on the
standard channel there will be no effect on performance.
HTH JohnG
32865e97b5342e762ab140e00f3da23b - Just 'Debian'
On Mon, 22 May 2000, Dan Hutchinson wrote:
> By default the SCSI card will slow the rpm to the slowest hard disk ie..
> if you have one disk at 10000rpm and one at 7200rpm both hard disks will
> be at 7200 rpm
>
> ---- "John F. Davis" <davis@skink.net> wrote:
> > Hello
> >
> > This is not a Debian linux question per se, but I
> > know someone on this list will know for sure.
> >
> > Can you mix scsi disks on a Adaptec 2930u2 adapter
> > and not have the slower disk slow down the faster one?
> >
> > I.e, I have a computer which currently has a u2w disk
> > with a u2w card and I want to know if I will get
> > a performance hit if I add a regular uw disk to the
> > same scsi channel. The card does not have two channels,
> > so if I add the second disk it has to be on the same
> > channel as the original disk.
> >
> > JOhn
> >
> >
> > --
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> > < /dev/null
> >
> >
>
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