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. James -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
