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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.
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Bit
Byte
76543210
0 Reserved RelAdr Reservation Type
1 - 3
(MSB)
Number of Blocks
(LSB)
4 - 7
(MSB)
Logical Block Address
(LSB)
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