IBM 7133 Series Service Manual

| Cable Configurations for Models 010 and 500| In the diagrams, the SSA connectors are numbered. These connector numbers match| those shown in “Model 010 Internal Connections” on page 1-17 and “Model 500 Internal| Connections” on page 1-20.Simplest Configuration for Models 010 and 500A 7133 Model 010 or Model 500 that is in base configuration includes four disk drivemodules. These modules are installed in the left-hand four slots at the front of the 7133.The other 12 disk drive slots contain dummy disk drive modules. The disk drive modulesare linked in groups of four. Each group of four modules is linked to two external SSAconnectors.In the simplest configuration, the SSA loop is completed by connecting these two SSAconnectors to one of the two pairs of connectors on an SSA adapter card in the usingsystem:7133 unitJ10 J91 2 3 4Using systemA1 A2 B1 B2When a Model 010 or Model 500 is in this configuration: The two fan-and-power supply assemblies in the 7133 provide redundant power andcooling to the disk drive modules. No improvement in performance is gained if the disk drive modules are moved toother slots and connected in more than one loop. If the modules are moved to otherslots, they might no longer have the protection of redundant power and cooling.The cables are described in “SSA Cables” on page 1-43. The internal connections ofModel 010 are shown in “Model 010 Internal Connections” on page 1-17; those of Model500 are shown in “Model 500 Internal Connections” on page 1-20.For information about the rules for SSA loops, see the “Rules for SSA Loops” onpage 1-42.1-44 7133 Service Guide