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100

101

SCSI Commands

5-206 Quantum DLT 8000 Tape System

RESERVE (10) Command (56h) (continued)

Table 5–91 RESERVE UNIT (10) Command — Field Descriptions (continued)

Field Description

Extent

If 0, requests that the entire logical unit be reserved for use only by the

initiator until the request is supplanted by another valid RESERVE command

from the same initiator, or until released via a RELEASE (10) command from

the reserving initiator, a hard reset, or a power on cycle.

If set = 1, the extent reservation option is implemented. This option allows

an application client in a multitasking environment to have multiple

reservations.

The size of the extent list is defined by the contents of the Parameter List

Length field. The extent list consists of zero or more descriptors. Each

descriptor defines an extent beginning at the specified logical block address

for the specified number of blocks. If the number of blocks is 0, the extent

begins at the specified logical block address and continues through the last

logical block address on the logical unit. The data format of extent

descriptors is shown in Figure 5-93.

Bit

Byte

7 6 5 4 3 2 1 0

0 Reserved RelAdr Reservation Type

1 - 3

(MSB)

Number of Blocks

(LSB)

4 - 7

(MSB)

Logical Block Address

(LSB)

Figure 5–93 Extent Descriptors — Data Format

1 2 ... 345 346 347 348 349 350 351 352 353 354 355 ... 407 408

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