Eben King wrote:
> 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.
>
Good point. I don't do much drive -> drive copying as I have an entire
drive for system and a second drive with 2 partitions mounted /srv and
/home
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