Reserve (10) command (56h) (continued) – Quantum 10K II User Manual
Page 262
SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
5–195
RESERVE (10) Command (56h) (continued)
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 5–91 Extent Descriptors — Data Format
The Reservation Type field defines the type of reservation in effect for the extent
being reserved. Available types of reservations are shown in Table 5-93.
Table 5–93 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.
RelAdr is always 0: The Quantum Atlas 10K II hard disk drive does not support
relative addressing.
If both the LongID and the Extent bits = 1, then the parameter list takes the format
shown in Figure 5-92.
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 5-91 Above)
(LSB)
Figure 5–92 Parameter List When LongID and Extent Bits = 1 — Data Format