Service manual

System Overview 1-3
Figure 1–1 shows the front view of the GS320 system cabinets. Systems from 1
to 32 CPUs, from 4 Gbytes to 256 Gbytes of memory, and from 13 to 27 PCI
slots for I/O options can be built in these cabinets. Expander cabinets
containing additional storage and/or PCI I/O capacity are optional and can
bring the total number of PCI slots to 224. For storage configuration rules, see
Appendix A and the AlphaServer GS80/160/320 User’s Guide.
The power cabinet contains:
• Two AC input boxes
• up to four power subracks, one for each system box, with two to three AC to 48 VDC
power supplies in each subrack (two power supplies are required)
• the operator control panel
• one required master PCI box plus optionally another PCI box and storage device or
two storage devices
• one terminal server
System cabinet 1 contains:
• up to two system boxes
• a console serial bus module
• a dual-output clock module in systems with one or two QBBs
• a distribution board in systems with only two QBBs
• an H-switch clock module for systems with more than two QBBs
• an hierarchical switch in systems with more than two QBBs
• a blower
System cabinet 2 contains:
• up to two system boxes
• a blower
Expander cabinet contains:
• up to four PCI boxes
• from two to ten disk storage shelves