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Re: Promise FastTrak Ultra ATA RAID host adapter

daemon@ATHENA.MIT.EDU (Dave Wreski)
Sat May 23 16:49:24 1998

In-Reply-To: <35671E1F.7F9D43B8@quiotix.com>
Date: 	Sat, 23 May 1998 17:41:59 -0400 (EDT)
From: Dave Wreski <dave@nic.com>
To: "Jeffrey B. Siegal" <jbs@quiotix.com>
Cc: linux-scsi@vger.rutgers.edu


>> And I HIGHLY doubt the truth of their claims. 25M/s? Maybe
>> with UDMA/33. *MAYBE*. But VERY doubtful. Drives aren't THAT good.
> 
> I get about 9+M/sec reading using a Quantum Fireball ST on a non-Ultra IDE
> controller, so it seems possible to achieve 25M/sec using UDMA, two IDE
> channels, and slightly faster drives.

So what exactly does that 33M/sec represent? Is that like the 40M/sec that
SCSI-3 is supposed to achieve, but never does?

Is that like the 'bus speed', as in the speed from the drive to the bus, or
somesuch?

Thanks,
Dave


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