Alan Cox wrote: > On Llu, 2006-03-27 at 09:43 -0800, Linus Torvalds wrote: > >>The fact is, BUS/ID/LUN crap really doesn't make sense for the majority of >>devices out there. Never has, never will. The fact that old-fashioned SCSI >>devices think of themselves that way has absolutely zero to do with >>reality today. > > > It is still a very visible reality if you work in a data centre or with > server kit, or if you have tape arrays or multi-CD towers. The LUN or > device number in particular are generally the number emblazoned on each > slot in the unit and knowing the LUN reliably is sort of critical to not > making embarrasing (and career limiting) screwups when swapping drives. > > Controller is a pretty abstract concept and except on arrays so is > device, but both device and LUN do need to be accessible reliably for > the hardware that thinks that way. What other hardware does is > irrelevant and "-EINVAL" seems as good an answer as anything. USB multi-card readers seem to like the concept of LUNs as well. Doug Gilbert "What, never? Well, hardly ever." G+S HMS Pinafore - : 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
