Re: IDE controller performance

From: Charles Sullivan (cwsulliv_at_triad.rr.com)
Date: 08/31/04 

Date: Tue, 31 Aug 2004 01:27:50 GMT

On Mon, 30 Aug 2004 13:13:31 -0400, John-Paul Stewart wrote:

> Richard Kimber wrote:
>> I currently have 2 disks on one IDE channel and a dvd recorder as master
>> on the second.
>>
>> I want to separate the disks and give them a channel each. I'm thinking
>> of buying a Promise ultra-ata 133 card.
>>
>> It would be easiest for me just to put the dvd on the first IDE channel of
>> the card, and put the slave disk as master on the old DVD channel. That
>> would seem to involve the least amount of re-configuration.
>>
>> I've seen suggestions (can't remember where) that there would be a
>> performance advantage in having the disks on the PCI controller rather
>> than on the M/B. Can anyone confirm this?
>>
>> M/B is MSI K8T Master2-FAR with 242 opterons.
>
> The only time I could imagine there being a performance advantage to the
> PCI card is if it were newer and faster than the IDE on the motherboard.
> For example, if the motherboard supported only Ultra-66 mode while the
> card (and disk) supported Ultra-133 mode, then I would think the PCI
> card might offer some advantage. However, as long as the motherboard
> supports the highest speed the disk can offer, I don't see how a PCI
> card could offer any advantage.
>
> One thing to be ware of though, is that some add-in PCI cards don't
> support the full ATAPI protocol; they are for hard disks *only*. Check
> into that before you buy if you really feel the DVD must be attached to
> the add-in card.

>From what I gather it may not be a good idea to mix a hard drive
and CD on the same Promise ribbon cable but I haven't tried that.
Depending on your bios you may not be able to boot from the CD.

I have a recent manufacture Promise Ultra133-TX2 which I use
for my hard drives and reserve the motherboard EIDE ports for
the ATAPI peripherals. The hard drives are recognized as
/dev/hde,f,g,h under Linux and boot from /dev/hde. Unless
you've got cable routing problems, this is probably the best bet.

 

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