Re: LINUX Jobs for 2.4 update [scsi]

From: Jens Axboe (axboe@suse.de)
Date: Sat May 27 2000 - 18:44:25 EDT

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    On Sat, May 27 2000, Gérard Roudier wrote:
    > > > I tossed the TEST_UNIT_READY
    > > > part out and INQUIRY alone works fine (one disk, 2 CDs and a tape on
    > > > a BusLogic clone - all found as per usual).
    > >
    > > Looks good to me. Although I can't possibly see what harm a TEST_UNIT_READY
    > > command could do...
    >
    > TEST UNIT READY seems not appropriate for the discovery of devices. It
    > also may return CHECK CONDITION when INQUIRY will succeed (and preserve a
    > UNIT ATTENTION CONDITION if any).
    >
    > On the other hand, it may be risky to try a TUR on an not existing LUN,
    > given that SCSI devices usually expect INQUIRY. Broken SCSI device
    > firmwares may arm on a TUR to a non existing LUN but not harm on an
    > INQUIRY.

    Thanks for shedding some light on this, it makes a lot more sense
    to me now. Anyway, the TUR has been removed so all should be well. 

    -- 
*  Jens Axboe <axboe@suse.de>
*  Linux CD/DVD-ROM, SuSE Labs
*  http://kernel.dk

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