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Re: ide-scsi with 2 drives



On Thu, 2004-12-30 at 09:41 -0500, Andrew Schulman wrote:
[snip]
> An optical drive (slow) running on the same IDE channel as a hard drive 
> (fast) will slow down data transfer to and from the hard drive, when the 
> optical drive is operating (by forcing a lower DMA mode?).  So in the 
> configuration above, if both DVD drives are operating at once-- say, 
> when making a direct disc-to-disc copy-- then both hard drives become 
> slow.  Bad.
> 
> OTOH, if both hard drives are on the same IDE channel, then they may 
> compete with each other for the bandwidth on that channel.  So again 
> this can slow things down.

The thing is that, unlike SCSI, only one device can be using an
IDE bus at any one time.

I guess the better solution would be to have One Big Hard Drive
on hda, and then put the 2 optical drives on hdc and hdd.  (How
often do you use 2 optical drives at the same time?

The optimal solution is to have them each on their own channel.
PATA, SATA & "PATA RAID sockets" fit the bill here.

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