Service manual

Table 5–2 shows the maximum number of scalar and vector processors
supported in a VAX 6000 Model 400 system.
Table 5–2: Processor Module Combinations
Maximum
CPUs
Maximum
Vectors
Configuration
(Slot 1 at Right)
6 0 P P P P P P
4 1 M V P P P P
2 2 M V P M V P
Figure 5–4 shows system configurations for a VAX 6000 Model 400 system
with one or two vector processors. The diagram on the left indicates the
configuration for two scalar/vector pairs (V- -P) with a memory module in
the slot to the left of the vector processor. The diagram on the right shows
a single scalar/vector pair with additional scalar processors.
Typically, processors are placed in the right <REFERENCE>(XMI) slots,
beginning with slot 1 and extending to slot 6. Memories are placed in the
middle slots, from slot A to slot 5 and then slots B and C, and VAXBI
adapters are installed in the left side of the card cage, beginning with slot
E. However, in a system with a vector processor, the modules should be
installed as shown in Figure 5–4. These configurations must be followed to
avoid damage to the modules and for performance reasons:
• Because the <REFERENCE>(xrv) module has VLSI components with
heat sinks protruding from both sides, only a memory module,
with its low components, can be placed next to side 2 of the
<REFERENCE>(xrv).
• In a system with one scalar/vector pair and one or more additional
scalar processors, the scalar processor of the pair should be prevented
from being the boot processor for performance reasons.
If the scalar/vector pair is to the left of other scalar processors, then the
processor of the scalar/vector pair will not become the boot processor
unless other processors fail self-test or have been disabled with the
SET CPU console command. Alternatively, you can issue the SET
CPU/NOPRIMARY command and give the node number of the attached
scalar processor that you do not want to be the boot processor.
<REFERENCE>(XRV) Vector Processor 5–7