Exabyte EXB-8205 Instruções de Operação Página 276

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19.1 About This Command
The RESERVE UNIT command reserves the CTS for an initiator’s
exclusive use or, if third-party reservations are in effect, for another
SCSI device’s use. The reservation remains in effect until a RELEASE
UNIT (17h) command is received from the same initiator or until the
CTSisresetbyaSCSIbusreset,aBusDeviceResetmessage,ora
power-on reset.
It is not an error for the initiator that made the last reservation to send
another valid RESERVE UNIT command.
If the CTS is reserved and any command (other than an INQUIRY
(12h), PREVENT/ALLOW MEDIUM REMOVAL (1Eh), or REQUEST
SENSE (03h) command) is received from another initiator, the
command will not be honored. Reservation Conflict (18h) status is
returned to the initiator that sent the command.
19.2 Field Definitions
Byte 01, Bit 4 - 3rdPty
The 3rdPty bit is used to request third-party reservations, as follows:
0 – A third-party reservation is not requested.
1 – A third-party reservation is requested.
Byte 01, Bits 3 through 1 - Third Party Dev ID
The Third Party Dev ID field indicates the SCSI ID of the device for
which the initiator is making the third-party reservation.
Byte 05, Bits 7 and 6 - Vendor Unique
There are no vendor unique definitions for this command.
19-2
EXB-8205 and EXB-8505
(Standard and XL)
510503
19 RESERVE UNIT (16h)
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