IBM 7133 Series Service Manual

Higher-Availability Configurations for Models 010 and 500For higher availability, you can connect more than one adapter in an SSA loop (up to eightpairs of adapter connectors if the adapters are Enhanced SSA 4-Port Adapters).In loops that have multiple adapters, you can often get best performance if you connectthe adapters as equally as possible between the disk drive modules.This example shows one 7133 connected in one loop with two adapter cards.7133 unitJ10 J91 2 3 4 5 6 7 8J6 J516 15 14 13 12 11 10 9J2J4J1J3Using systemA1 A2 B1 B2Using systemA1 A2 B1 B2The 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.Chapter 1. Reference Information 1-49