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From: Peter Petrakis (voodooalphadriven.org)
Date: Fri Mar 15 2002 - 08:07:03 CST

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    > The one question I don't know about FireWire... can you run SCSI protocol
    > over it like you can with Fibre? I assume that is what is happening with
    > things currently, but I don't know.

    I would say no for the moment though considering the diversity of the 1394
    spec, http://www.1394ta.org/Technology/Specifications/specifications.htm.
    It's about as far off as someone just getting the initiative to 'do' it.

    > The point being, FireWire has the potential to address far more devices
    > than SCSI -- but since it is still a serial buss, the biggest problem
    > becomes Distance. If you want SCSI 160 you are seriously distance limited.
    > One assumes that will also become the case with the new FireWire standard.

    The proposed 1394B spec fixes the distance problem. You'll actually be able
    to use
    it as a networking device. Like FibreChannel, just cheaper :-)

    > But in any case, unless you can fire off an I/O and then allow the device
    > to disconnect from the bus until it completes, the actual
    > throughput issues
    > trancend the simple meg speeds.

    Yup though I'm pretty sure FW devices can disconnect. I'll check on that.

    > With disk drives, the real killer is RPMs. Rotational Latency is where the
    > speed differences show up. 5400, 7200, 15K RPM drives all have a

    IDE seems to be 'stuck' at 5200 RPM for what reason I don't know. The new
    15K SCSI's are extremley fast but they are so LOUD that they don't belong
    anywhere but in a machine room.

    > the art in FireWire disk drives has the ability of the bus and the ability
    > of the drives pretty well matched. Hence the tremendous drop in price
    > recently of FireWire drives created by using these wrappers.

    That sounds about right. It fills it's niche nicely.

    > [And for what it's worth, I've now probably exhausted all of my
    > rememberences from my last contact with Riche Larry.]

    :-)

    Peter 

    --
www.linuxalpha.org	www.alphadriven.org
Peter Petrakis         Warrior/Engineer        voodooalphadriven.org
"<BLAM!!> Who the hell are you!? Name's Ash <click clock> Housewares..."

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