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    SubjectRe: [PATCH] libata: rewrite SCSI host scheme to be one per ATA host
    On Wed, 2009-04-22 at 14:36 -0400, Jeff Garzik wrote:
    > James Bottomley wrote:
    > > On Wed, 2009-04-22 at 16:18 +0100, Alan Cox wrote:
    > >>> Don't forget, there are ATAPI devices (some Sony CD burners and old
    > >>> phase-changers come into mind) which *do* have multiple LUNs sitting
    > >>> beyond the PATA port. I don't know if libata supports such setups (my
    > >>> old OS/2 driver does) but one shouldn't hijack LUNs to emulate targets.
    > >> It's a long time ago since I tested it but my 5 CD changer was correctly
    > >> supported by libata (or more accurately by sr...).
    > >
    > > Well, sr supports the discovered CD/DVD; ch is the actual changer
    > > manager. Usually ch attaches to one LUN and sr attaches to another.
    > Like Alan's, if I understand him correctly, my PATA ATAPI CD changer
    > simply presents a bunch of addressible LUNs. I never loaded, nor seemed
    > to need, ch.

    Yes, they both seem to be non standard changer implementations that just
    present as many CDs as they could chage to.

    The ch is actually a driver for devices which conform to the SCSI Media
    Changer standard, which tends to present LUN zero as the smc device and
    LUN1 as the selected CD/DVD

    > I should boot a current libata and see how it behaves...

    Might be fun.


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