On Wed, 11 Jan 2006, Ian C. Blenke wrote:
> Chris Mathey wrote:
>
> > Both disks are capable of UDMA mode 5, however /dev/hdc only lists up
> > to udma2. Why do you think mode 5 is not listed? I haven't checked but
> > It's possible a CD-ROM is slaved on the same channel. Could that be it?
>
> You would actually be better off putting _both_ of your IDE harddrives
> on the _same_ bus, and the CD-ROM on the other.
>
> While it may once have been true that putting a master/slave on the same
> bus would slow it down, at UDMA mode 5+ rates, any slowdown is not
> perceptible. You _might_ notice a 5-10% slowdown on that bus with
> bonnie, at most, if at all.
But copying data between the drives will be subject to a 50% slowdown, as
the source drive writes to RAM, then the destination drive reads from RAM.
Can't do them simultaneously, as there's only one cable. Each drive
evaluated independently, though, would be as Mr. Blenke said.
Ideally, you'd probably get an extra PCI IDE card and hook the CD to that,
but that depends how much an extra 10.4 MB/s is worth, and how often you do
drive -> drive copying.
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