----- Original Message -----
From: "Dan Hollis" <[EMAIL PROTECTED]>
To: "Jarkko Kniivil�" <[EMAIL PROTECTED]>
Sent: Thursday, July 20, 2000 1:20 AM
Subject: Re: 3Ware Escalade 5000 & 6000, opinions?
> On Thu, 20 Jul 2000, [iso-8859-1] Jarkko Kniivil� wrote:
> > between Linux (2.2.x) SW RAID and LVM. And then there's the idea that
maybe
> > the sophisticated elevator routines that make SCSI drives so much better
in
> > JBOD setups are not so much better in a RAID setup if the controller has
its
> > own elevator routines.
>
> The elevator routines are in the linux kernel.
>
Sorry if I used the wrong term but I was referring the routines in the drive
firmware that respond to command tag queueing and optimally rearrange the
order of subcommands in the queue. Isn't this elevator term basically the
same concept, or am I mistaken?
> Don't fool yourself, most SCSI drives are the exact same hardware as the
> IDE drive, just with a different physical interface. But the firmware is
> largely the same.
>
If thats the case why do people buy SCSI if not for the multi-tasking
scalability in server conditions, ie. the rearrangement of IO requests? I
had the impression that a SCSI drive has a certain electrical interface not
much different from IDE (although more scalable) but the main difference was
in controller PCB on the drive which is housing a more sophisticated
firmware and possibly a more efficent CPU/DSP supporting the firmware.
> -Dan
>
// Jarkko
