Basic IDE - disk per channel performance

Andrew Jorgensen andrew.jorgensen at gmail.com
Mon Nov 13 17:15:38 MST 2006


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. Not
only would two disks ruin the performance, but the failure of a disk
often guarantees the failure of the bus, and therefore the failure of
all disks on that bus. In a fault-tolerant RAID setup (RAID levels
1,4,5), the failure of one disk can be handled, but the failure of two
disks (the two disks on the bus that fails due to the failure of the
one disk) will render the array unusable. Also, when the master drive
on a bus fails, the slave or the IDE controller may get awfully
confused. One bus, one drive, that's the rule.

http://tldp.org/HOWTO/Software-RAID-HOWTO-4.html#ss4.1



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