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SubjectRe: Linux as a SCSI _Target_ device?

On Wed, 11 Nov 1998, Jeff Noxon wrote:

> One big problem is stuffing a lot of IDE interfaces in a linux box.
> The hardware would be trivial (i.e. an 8-channel PCI IDE controller).
> But it's not exactly an off-the-shelf thing.

If you are building an 'off-the-shelf' Linux based hardware-RAID box,
you'll be better off with SCSI. No need for Ultra, just Wide and lots of
cards, lots of disks. Casing is not cheap usually, especially if it's
hot-swap, but it's such a simple component that i suspect it's just
because it's a server niche ... Anyway, Linux-RAID scales up to a few 10s
of MB/sec IO bandwith. To go near 100MB/sec it has to be a careful pick as
it's near what todays PII based system can provide ... in theory. A single
(dedicated) A dual-PII can deal with this, the MMX-XOR routine saturates
memory bandwith up to ~300MB/sec realistically. (of course at the expense
of CPU time, but this isnt a problem for a dedicated box) I'd worry more
about PCI bandwith, and about those custom 'generic SCSI device' cards.
(with such a solution, IO bandwith goes through the PCI bus twice, so we
have a max about ~100MB/sec)

-- mingo


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