Quantum DLT 4000 Manual descargar pdf (Pagina 107)

SCSI Commands

Quantum DLT 4000 Tape Drive 5-7

5.1.3 Status/Error Reporting

SCSI message-level errors are communicated by messages that are defined

specifically for that purpose (for example, MESSAGE PARITY ERROR,

MESSAGE REJECT). Message-level errors are also handled by drive-managed

retries. Refer to Chapter 4 for more detailed message-handling information.

SCSI command-level errors are communicated by a status code that is returned

by the drive during the STATUS phase. This phase occurs at the end of each

command, unless the command is terminated by one of the following events:

• ABORT message

• BUS DEVICE RESET message

• Hard reset condition

• Unexpected disconnect

The status code is contained in bits 1 through 5 of the status byte. Bits 0, 6, and

7 are reserved. Table 5–4 describes the status codes returned by the drive.

NOTE

In contrast to the BUSY status condition, the DRIVE NOT READY

Sense Key is returned as part of the Sense data following a REQUEST

SENSE command and indicates that a media access command has

been issued and the medium is not ready to be accessed. For

example, the medium is not installed, the medium has been

unloaded, and the drive is currently initializing the medium to

prepare it for access).

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Quantum DLT 4000 Manual Pagina 107