Promise UDMA, FastTrack & NT.

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Joined: Jul 8 1999

Information required on FastTrack and NT Please. Is it possible to run an Adaptec SCSI controller (2940U2W) and a Promise/ FastTrack on the same Mboard (GA-6BXD) under NT?
Can someone please explain the difference between Promise UDMA and FastTrack cards.
Does NT4 support UDMA or FastTrack and depending upon your answer what transfer speeds are possible?
Thanks in anticipation.


Joined: Mar 8 1999


Yes. I'm running an Adaptec SCSI (not your exact one) and a Promise card on the same system (probably a different motherboard to yours).

The key is to get the IRQs right. See my forthcoming articcle on upgrading my network.


That's actually a difficult question. Promise say that the difference is that the Promise Ordinary will control up to 4 drives of any size, but you can only have one in a system.
The Fastrak does the same, and also offers RAID (striping, spanning and mirroring). And you can put two cards on one system.

The truth is that the Raiding is done in software, not by the card. I have an untested
suspicion that the cards are actually the same, with different drivers. For evidence of this, see my forthcoming etc etc.


Yes, both. The possible transfer speeds are:
blinding, very blinding and totally blinding.

You get blinding, by using either card, with any drive.

You get very blinding, by using the Fastrak and using striping, because then you're writing data to two drives at once.

You get totally blinding by doing the above, and putting a big gob of memory into the NT
box (256 mb, more if you want). That helps NT cache things.

The exact definition of the three sorts of blinding, in megabytes per second, depends on the drives you use, the speed of your computer, how much memory cache the drives have, how much memory the computer has, etc etc etc.

I'm able to copy a 150 mb file, from a workstation across my network, to the NT server, in 24 seconds. That's 6 mb/second. I can't think why you'd want it faster. And, remember, that's including the slowness of reading from the workstation, and the network overhead.