Quantum 1200 Series DAT Autochanger Guia do Utilizador descarregar pdf (Página 273)

SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-231

A reservation with the RESERVE UNIT command remains in effect until one of the following

conditions is met:

• Another valid RESERVE UNIT command from the initiator supersedes it.

• A RELEASE UNIT command from the same initiator releases it.

• A TARGET RESET message from any initiator releases it.

• A reset condition releases it.

The occurrence of the last two conditions is indicated by the drive returning a CHECK CONDITION

status, Sense Key set to UNIT ATTENTION on the next command following the condition. It is not an

error to issue a RESERVE UNIT command to a drive that is currently reserved by the requesting

initiator.

If another initiator has previously reserved the drive, the drive returns a RESERVATION CONFLICT

status.

If, after honoring the reservation, any other initiator attempts to perform any command except

INQUIRY, REQUEST SENSE, or RELEASE UNIT, the drive rejects the command with a

RESERVATION CONFLICT status. That drive ignores a RELEASE UNIT command issued by

another initiator.

An initiator that holds a current reservation may modify that reservation—for example, to switch third

parties—by issuing another RESERVE UNIT command to the drive.

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Quantum 1200 Series DAT Autochanger Guia do Utilizador Página 273