Basic IDE - disk per channel performance

Michael Halcrow mike at halcrow.us
Mon Nov 13 17:27:17 MST 2006


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On Mon, Nov 13, 2006 at 05:15:38PM -0700, Andrew Jorgensen wrote:
> On 11/13/06, Kenneth Burgener <kenneth at mail1.ttak.org> wrote:
> >Is there a benefit of putting a software raid array on separate
> >channels?
> 
> >From The Linux Software-RAID HOWTO:
> 
> It is very important, that you only use one IDE disk per IDE bus.

That's why I have three chipsets to service 6 disks in my RAID. Don't
put the OS disk and a RAID disk on the same channel. And don't try to
use two SIL0680 chips in the same box (the Linux driver probably can't
handle two cards); get a SIL0680 and a High Point or a Promise. Or,
better yet, get a 4-channel IDE card.

Keep in mind that trying to manage 6+ ribbon cables in any box can be
a pain in the neck. The IDE connections seem to be a bit flimsy in my
box too, leading to phantom drive failures (OS-reported failures that
aren't really drive failures; some cable just needed to be
reseated). The next time I build a software RAID, I am definitely
going all SATA.

Mike
.___________________________________________________________________.
"The thing about hell is that's exactly the place where you want to
be."
 - Joseph Campbell

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