System Setup and Configuration
3.8 Firmware Commands and Utilities Used in System Configuration
$ALLCLASS$DIA
u
where:
ALLCLASS is the allocation class for the system and devices, and
u
is a unique
unit number.
Using mass storage expanders, you can fill multiple DSSI buses: buses 0 and
1 supplied by the CPU module, and a third and fourth DSSI bus using two
KFQSA adapters. Each bus can have up to seven DSSI devices (bus nodes 0–
6). When more than one bus is being used, and your system is using a nonzero
allocation class, you need to assign new unit numbers for devices on all but
one of the DSSI buses, since the unit numbers for all DSSI storage devices
connected to a system’s associated DSSI buses must be unique.
Figure 3–8 illustrates the need to program unit numbers for a system using
more than one DSSI bus and a nonzero allocation class. In the case of the
nonzero allocation class, the operating system sees three of the ISEs as
having duplicate device names, which is an error, as all unit numbers must be
unique.
System Setup and Configuration 3–31
