Re: cdrecord and scsi-3 compliance
>From: Andy Polyakov <appro@fy.chalmers.se>
>> One can imagine burners w/ disc change mechanism,
>One should rather imagine e.g. FCAL tower enclosure for multiple
>off-the-shelf units. Host can address individual units by LUN, but it
>(addressing) is done at lower communication layer, not in command data
>block. I mean if one would project SCSI-3 on ISO 7 layer networking
>model and put command block at transport layer, LUN addressing would end
>up at network, if not link layer.
True for good old SCSI, not true for ATAPI drives.
They just don't have a different way to signal lun numbers.
>As for disc changing units. MMC specification provides for this through
>MECHANISM STATUS(BDh) and "slotted" LOAD/UNLOAD MEDIA(A6h) commands.
>Media is changed explicitly by issueing latter command. A.
I've never seen any drive that supports this and I did not yet see an OS
where it seems that this is supported.
Using different luns will just work anywhere.
Jörg
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EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
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