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?
>
>
>
> Ooops. Missed that part of your email.
>
> Yes. The bus is only as fast as the slowest component on it. If your
> CD-ROM can only talk mode 2, that completely explains why the second
> drive is so slow.
>
> 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.
>
> Most delay today is not in the bus wiring, it is waiting for the drive
> heads to seek on the platter and traffer data to the drive buffer. If
> you can keep the buffers busy on the drives on a shared bus, there's
> really no impact to having a master/slave setup anymore (falling back to
> the highest mode that both drives can utilize the shared ATA bus).
>
> - Ian C. Blenke <ian@blenke.com> http://ian.blenke.com/
>
>
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>
thanks for the replies,
This weekend I am going to power down and crack open the case. I haven't
opened for awhile so I don't remember what kind\shape the cables are in.
I will probably move the "storage" drive over as a slave on ch. 0 and
then recheck all the timings.
-Chris
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