Re: Linux SATA RAID FAQ

Alan Cox
2004-08-16T23:03:24Z

On Llu, 2004-08-16 at 23:06, Andrew Morton wrote:
> I'm sitting on the vendor's driver for these cards. How does your work
> differ from this?

It uses the IDE layer instead of badly duplicating it in essence.

> hch questioned why we need the driver at all: just put the card in JBOD
> mode and use s/w raid drivers. But the thing does have an on-board CPU and
> the idea is that by offloading to that, the data transits the bus just a
> single time. The developers are off doing some comparative benchmarking at
> present.

On my set up raid1 is materially faster using their processor and raid0
is materially faster not. There are also co-existance issues with
Windows dual boot setups. The PCI single copy makes a big difference on
a 32bit/33Mhz plug in card.

Alan