SCSI Commands

RESERVE UNIT Command (16h) (continued)

A reservation via the RESERVE UNIT command remains in effect until one of the following conditions is met:

∙The initiator that made the reservation sends another RESERVE UNIT command.

∙The tape drive is released via a RELEASE UNIT command from the same initiator.

∙A BUS DEVICE RESET message is received from any initiator.

∙A hard reset occurs.

The occurrence of the last two conditions is indicated by the drive returning a CHECK CONDITION status, sense key of 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 logical unit, the target 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 command is rejected with a RESERVATION CONFLICT status. That logical unit 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 tape drive.

Medium Changer Considerations for RESERVE UNIT Command

The optional Element Reservation feature defined for Medium Change devices as described in the ANSI SCSI-2 specification is not supported. The RESERVE command is defined the same as for the tape drive. The whole loader unit may be reserved. This is separate from a reservation of the tape drive.

The RESERVE / RELEASE commands operate on a LUN basis. The Medium Changer and the tape drive are generally handled as different devices. In the case of a reserved drive LUN, a MOVE MEDIUM command issued to the Medium Changer LUN cannot insert or remove a tape cartridge to or from a tape drive unless the tape drive is reserved by the same initiator.

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Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Reserve Unit Command 16h
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