Contents
Safety Notices........................xv
Definitions of Safety Notices ...................xv
Safety Notice for Installing, Relocating, or Servicing............xv
About This Book ......................xvii
Who Should Use This Book ...................xvii
What This Book Contains ....................xvii
If YouNeed More Information ...................xvii
Web Support Pages......................xviii
Numbering Convention.....................xviii

Part 1. User Information ........................1

Chapter1. Introducing SSA and the Advanced SerialRAID Adapters .....3
Serial StorageArchitecture (SSA) ..................3
TheAdvanced SerialRAID Adapters (type 4–P) .............4
Fast-Write Cache Feature ...................5
128 MB Memory Module Feature .................5
Lights of theAdvanced SerialRAID Adapters .............6
PortAddresses of theAdvanced SerialRAID Adapters ..........6
SSAAdapter ID during Bring-Up ..................6
Chapter2. Introducing SSA Loops .................7
Loops, Links, and Data Paths ...................7
Simple Loop ........................8
Simple Loop —One Disk Drive Missing ...............9
Simple Loop —TwoDisk Drives Missing ..............10
One Loop with TwoAdapters in One Using System ...........11
One Loop with TwoAdapters in Each of Two Using Systems .......12
TwoLoops with One Adapter ..................14
TwoLoops with Two Adapters ..................15
Large Configurations ......................16
Switching Off Using Systems ..................17
Switching On Using Systems ..................17
Configuring Devices on an SSALoop ................18
SSALink Speed .......................18
Identifying and Addressing SSA Devices ...............19
Location Code Format ....................19
Pdisks, Hdisks, and Disk Drive Identification .............19
SSAUnique IDs ......................21
Rules for SSALoops ......................22
Checking the Level of theAdapter Microcode ..............23
Rules for the Physical Relationship between Disk Drives andAdapters .....24
One Pair ofAdapter Connectors in the Loop .............24
Pairs ofAdapter Connectors in the Loop –Some Shared Data .......25
Pairs OfAdapter Connectors in the Loop –Mainly Shared Data ......26

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