Re: 2 IDE - 1 CD: which interfaces
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On Saturday 24 May 2003 7:31 pm, Bill Moseley wrote:
> I can never remember. With two IDE drives and one IDE CD do you place both
> hard drives on the same IDE interface as master and slave and the CD on the
> secondary as master, or do you place the two IDE drives on separate
> interfaces and make CD slave on one of the interfaces?
>
> I think I remember that you separate the CD from the hard drives because
> the CD can slow down the entire interface. But if that's true does the CD
> always degraded the interface or only when the CD is being accessed.
>
The answer depends on what you are using the disks for.
Fundementally, for a given IDE channel, the two devices cannot be doing IO at
the same time. Because inherently the CD device is slower than a disk (even
if it can do dma) you are often advised not to put the two together.
However, if you hardly use the CD and could benefit from overlaping
operations between two hard drives (say one on hda and one on hdc) then go
ahead and do it.
that debian package sysstat contains iostat - which helps you see whats going
on.
- --
Alan Chandler
alan@chandlerfamily.org.uk
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