Quantum DLT 8000 Product Manual page 351

RESERVE UNIT (10) Command (56h) (continued)
RelAdr is always 0: The DLT 8000 tape drive does not support relative addressing.
The Reservation Type field defines the type of reservation in effect for the extent being
reserved. Available types of reservations are shown below.
Reservation Type
00b
01b
10b
11b
If both the LongID and the Extent bits = 1, then the parameter list takes the format
shown below.
Bit 7
Byte
(MSB)
0 - 7
(MSB)
8 - n
Figure 5-94 Parameter List When LongID and Extent Bits = 1 — Data Format
Table 5–92 Reservation Types
Description
READ shared. No write operations are permitted by any initiator to
the reserved extent. Any initiator may read from the extent.
WRITE exclusive. No other initiator may write to the indicated
extent. Any initiator may read from the extent.
READ exclusive. While this reservation is active, no other initiator
may be permitted to read to the indicated extent.
Exclusive access. While this reservation is active, no other initiator is
permitted any access to the reserved extent.
6 5
Third Party Device ID
Extent Descriptors
(See Figure 5-93)
Quantum DLT 8000 Tape System
4 3
SCSI Commands
2 1 0
(LSB)
(LSB)
5-207