Mixing IDE and IDE-SCSI emulation on a Channel

From: Reuben D. Budiardja (techlist_at_voyager.phys.utk.edu)
Date: 02/27/04

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    To: redhat-list@redhat.com
Date: Fri, 27 Feb 2004 08:56:05 -0500

    Hi all,
    I recently put in a CD-RW drive in my system, and make it the master drive on
    the secondary channel (hdc). The CD Rom drive that was already there becomes
    the slave hdd.
    Following the CD-Writing-Howto, I finally figure out how to use
    cdrecord/xcdroast and that I have to use the CD-RW as a SCSI device using the
    ide-scsi emulation module (the Redhat doc in redhat site is horrible and not
    helping by the way).

    But I still can't figure out how to play regular CD player, or rip a CD to mp3
    using grip on that CD-RW drive, which acts as if it were a SCSI device. No
    problem, I thought, I just use the other CD-rom drive. However, when ripping
    a CD, I notice that the performance is kinda slower than usual. For example,
    lame would have to sit idle waiting for the ripping to complete, when usually
    the ripping of 1 CD would complete and lame would be behind like 75 % of
    completion.
    Another problem, I have found the CD-ROM device to generate errore like below,
    2 times after I installed the CD-RW:

    kernel: hdd: ATAPI reset complete
    kernel: hdd: irq timeout: status=0xd0 {Busy}
    kernel: hdd: irq timeout: error=0xd0LastFailedSense 0x0d

    Once it makes the system hung intermittenly, it almost crashed the system. But
    I managed to reboot and it seems that it fixed the problem (at least up till
    now). I don't know if this just coincidence of has anything to do with the
    newly installed CD-RW.

    So, no real quantitative assesment yet (not sure how to do that), but I am
    wondering if mixing the IDE-SCSI simulated device (CD-RW) and IDE/ATAPi
    device (CD-rom) in a single channel as Master and Slave would make my CD-ROM
    slower and generate those problems.

    Any info / comments will be greatly appreciated.

    Thanks.
    RDB 

    -- 
Reuben D. Budiardja
Department of Physics and Astronomy
The University of Tennessee, Knoxville, TN
---------------------------------------------------------
"To be a nemesis, you have to actively try to destroy 
something, don't you? Really, I'm not out to destroy 
Microsoft. That will just be a completely unintentional 
side effect."
                 - Linus Torvalds -
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