Quantum DAT 24 Drive Guia do Utilizador descarregar pdf (Página 43)

SCSI Interface Description Page 31

General Operation

• The Reserve and Release commands may be addressed to either LUN, but

affect both LUs as a unit. In other words, if an initiator has reserved either LU,

then both LUs will reply with a status of Reservation Conflict to most SCSI

commands from other initiators. This is departure from the SCSI standard, but it

prevents the situation of each LU being reserved by a different initiator.

• Busy status affects the Autoloader as one unit. LUN 0 is busy when LUN 1 is

busy, and vice versa.

• The Ready and Not Ready conditions are reported separately for the two LUs.

For example, if the loader contains a magazine, but no cassette has yet been

loaded into the drive, then LUN 1 will be ready and LUN 0 will not. Whenever

the drive contains a cassette, both LUs will be ready.

• Reset conditions affect the Autoloader as one unit. A Bus Device Reset or SCSI

Bus Reset initializes both LUN 0 and LUN 1.

• An Unload command to LUN 0 ejects the cassette from the drive and stores it in

the magazine slot in which it last resided. If the Autoload feature is enabled, the

next cassette in sequence is then loaded. An Unload command to LUN will

return a cassette in the drive (if any) to its original magazine slot and will then

eject the magazine.

• Following is a list of Request Sense sense key/additional sense code/qualifier

values that are particular to the medium changer. A complete list appears in the

Request Sense command discussion in Chapter 3.

Sense Code Title

05/21/01 Invalid Element Address

05/3B/0D Medium Destination Element Full

05/3B/0E Medium Source Element Empty

02/3A/00 Medium Not Present (Reported if there is no magazine in the

loader or if the magazine is empty and the drive contains no

cassettes)

06/28/00 Not Ready To Ready Transition (Reported after magazine is

inserted or if cassettes are loaded or changed by front panel

command. Cassette movement by SCSI command will not

result in this condition.

Loading and Initialization

The Scorpion 240 autoloader uses a six-slot magazine that is keyed to prevent

incorrect insertion of cassettes into the magazine and incorrect insertion of the

magazine into the loader. The slots are numbered 1 through 6, with 1, 2, and 3 on

one side of the magazine and 4, 5, and 6 on the other. When a magazine is inserted

into the loader, the door folds down and out of the way and the magazine should be

pushed in gently until the loader mechanism begins to draw the magazine in; the

door must be allowed to close.

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Quantum DAT 24 Drive Guia do Utilizador Página 43