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Chapter 3 Media Changer Commands
Reserve Element (10) Command (56h)
160 Quantum ATL SuperLoader Software Interface Guide
Reserve Element (10) Command (56h) 3
The RESERVE and RELEASE commands are used for contention
resolution in multiple-initiator systems. The RESERVE command
is used to reserve a logical unit. The RESERVE (10) Command
Descriptor Block is shown in figure 82, and the data fields are
described in table 67
on page 161.
Figure 82 Reserve
Element (10)
Descriptor
Bit
Byte7654 321 0
0
Operation Code (56h)
1
Reserved 3rdPty Reserved LongID Element
2
Reservation Identification
3
Third Party Device ID
4 - 6
Reserved
7 - 8
(MSB)
Parameter List Length
(LSB)
9
Unused Reserved Flag Link
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