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100

101

SCSI Commands

Quantum DLT 8000 Tape System 5-207

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.

Table 5–92 Reservation Types

Reservation Type Description

00b READ shared. No write operations are permitted by any initiator to

the reserved extent. Any initiator may read from the extent.

01b WRITE exclusive. No other initiator may write to the indicated

extent. Any initiator may read from the extent.

10b READ exclusive. While this reservation is active, no other initiator

may be permitted to read to the indicated extent.

11b Exclusive access. While this reservation is active, no other initiator is

permitted any access to the reserved extent.

If both the LongID and the Extent bits = 1, then the parameter list takes the format

shown below.

Bit

Byte

7 6 5 4 3 2 1 0

0 - 7

(MSB)

Third Party Device ID

(LSB)

8 - n

(MSB)

Extent Descriptors

(See Figure 5-93) (LSB)

Figure 5-94 Parameter List When LongID and Extent Bits = 1 — Data Format

1 2 ... 346 347 348 349 350 351 352 353 354 355 356 ... 407 408

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