Specifications

3–11
Compaq HSG80 Array Controller ACS Version 8.4 Configuration and CLI Reference Guide
Figure 3–6 Controller Port ID and Unit Numbers in Transparent Failover Mode
Assigning Unit Numbers in Multiple-Bus
Failover Mode
In multiple-bus failover mode, the range of assignable units that are accessible from
any port on the subsystem is 0–199. Hosts obtain units by reserving the unit for sole
access. This process is performed on a first-available basis or by assigning host
access. Figure 3–7 illustrates the controller port ID and unit numbers in multiple-bus
failover mode.
Controller A
Port 1 (Active)
Units 0-99
Port 2 (Standby)
Units 100-199
Controller B
Port 1 (Standby)
Units 0-99
Port 2 (Active)
Units 100-199
CXO6187B