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SCSI Commands
5-12 Quantum DLT 7000 Tape System
• When a WRITE 0 FILEMARKS command is issued.
• When data has been in the cache longer than the maximum time specified by
the value of the Mode Parameter “Write Delay Time” (the default is 30
seconds).
• When a non-write type media access command is received (for example,
SPACE, READ, UNLOAD, LOCATE, ERASE).
5.2 SCSI COMMAND DESCRIPTIONS
The SCSI commands are presented in alphabetical order. Each command starts
on a new, odd-numbered page. Because information about a particular command
may span multiple pages, the command name is repeated, in italics, at the top of
every page that concerns that command. Blank pages in the chapter can be used
for note-taking.
The SCSI command descriptions that make up the rest of Chapter 5 contain
detailed information about each command supported by the Quantum DLT 7000
system tape drive. Fields common to many of the SCSI commands are supported
as follows:
Name of Field: How Field is Supported in SCSI Commands:
Logical Unit Number LUN for tape drive is 0.
Reserved Reserved bits, fields, bytes, and code values are set aside for
future standardization and must be set to 0. If the drive
receives a command that contains non-zero bits in a
reserved field or a reserved code value, the command is
terminated with a CHECK CONDITION status and the sense
key is set to ILLEGAL REQUEST.
RelAdr Relative Address. Unused; contents should be 0.
Explanations for those common fields are not repeated for every command in
which they appear.