> -----Original Message-----
> From: Daniel Roesen [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, April 25, 2000 3:07 PM
> To: [EMAIL PROTECTED]
> Subject: Re: performance limitations of linux raid
>
>
> On Tue, Apr 25, 2000 at 10:28:46PM +0100, Paul Jakma wrote:
> > Clue: the Promise IDE RAID controller is NOT a hardware RAID
> > controller.
> >
> > Promise IDE RAID == Software RAID where the software is written by
> > Promise and sitting on the ROM on the Promise card getting called by
> > the BIOS.
>
> Clue: this is the way every RAID controller I know of works
> these days.
Then you've never used a RAID card. I've got a number of RAID cards here, 2
from compaq, 1 from DPT, and another from HP (really AMI), and all of them
implement RAID functions like striping, double writes (mirroring), and
parity calculations for RAID4/5 in firmware, using an onboard CPU. All the
controllers here are i960 based, but I've heard that the StrongARM procs are
much faster at parity caclculations. The controllers that I've used that
are software are the Adaptec AAA series boards. The other one that I know
of is this Promise thing.
Greg
