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Chapter 1. Introducing SSA and the Advanced SerialRAID Adapters
This chapter describes:
v Serial storage architecture (SSA).
v The Advanced SerialRAID Adapter and the Advanced SerialRAID Plus Adapter.
Physically, the two types of adapter are the same. The Advanced SerialRAID Plus
Adapter, however, provides additional functions.
In this book, the name “Advanced SerialRAID Adapter” is used both for the Advanced
SerialRAID Adapter and for the Advanced SerialRAID Plus Adapter, unless otherwise
stated.
Serial Storage Architecture (SSA)
Serial Storage Architecture (SSA) is an industry-standard interface that provides
high-performance fault-tolerant attachment of I/O storage devices. In SSA subsystems,
transmissions to several destinations are multiplexed; the effective bandwidth is further
increased by spatial reuse of the individual links. Commands are forwarded
automatically from device to device along a loop until the target device is reached.
Multiple commands can be travelling around the loop simultaneously. SSA retains the
SCSI-2 commands, queuing model, and status and sense bytes.
3
- User’s Guide and 1
- Maintenance Information 1
- Contents 5
- Contents v 7
- Contents vii 9
- Contents ix 11
- Contents xi 13
- Contents xiii 15
- Safety Notices 17
- About This Book 19
- Web Support Pages 20
- Numbering Convention 20
- Part 1. User Information 21
- 4 Connector A2 24
- Fast-Write Cache Feature 25
- 128 MB Memory Module Feature 25
- Loops, Links, and Data Paths 27
- Simple Loop 28
- Two Loops with One Adapter 34
- Two Loops with Two Adapters 35
- Large Configurations 36
- Switching Off Using Systems 37
- Switching On Using Systems 37
- SSA Link Speed 38
- Location Code Format 39
- SSA Unique IDs 41
- Rules for SSA Loops 42
- Reserving Disk Drives 47
- Fast-Write Cache 47
- RAID Functions 49
- Availability 49
- RAID-0 Array States 51
- Good State 51
- Offline State 51
- RAID-1 Array States 52
- Rebuilding State 54
- Initial Rebuilding Operation 54
- Disk Drive Replacement 54
- Adapter Replacement 54
- RAID-5 Array State Flowchart 55
- RAID-10 Array States 56
- Exposed State 56
- Degraded State 57
- Unknown State 58
- Multiple States 58
- Building 1 Building 2 66
- Enclosure-1 69
- Enclosure-2 69
- Enclosure-3 69
- Enclosure-4 69
- Adding an SSA RAID Array 80
- Deleting an SSA RAID Array 90
- Adding a New Hot Spare Pool 103
- Service Guide for the unit) 114
- Disk Drive” on page 95 114
- Listing Hot Spare Disk Drives 131
- Listing System Disk Drives 137
- Copying Data from an Array 171
- RAID-10 Array 171
- Figure 24) 180
- Description 181
- Name (2) 188
- Another Using System 189
- Array Copy Services 193
- Prepare a Copy 195
- List All Copy Candidates 199
- List All Uncoupled Copies 201
- Delete a RAID Array Copy 203
- System 1 216
- SSA Adapter 216
- Primary 1 216
- Secondary 1 216
- Split Array Resolution 217
- = Primary 217
- System 2 218
- Split Systems 219
- Secondary 2 220
- Correctly 225
- Fast-Write Cache Card Battery 231
- SRN 42521 238
- and fsdb) to attempt to 239
- SRN 42524 240
- SRN 42525 240
- Chapter 11. SSA Error Logs 241
- Detailed Description 242
- Detail Data Formats 245
- Duplicate Node Test 247
- Error Logging Management 248
- Error Log Analysis 249
- Error Log Analysis Routine 250
- Good Housekeeping 253
- Configurations 255
- Command Syntax 257
- Object Types 258
- Instruct Types 258
- Examples 259
- SSARAID Command Attributes 264
- Arrays Only 265
- RAID Arrays Change Attributes 268
- Return Codes 273
- SSA Subsystem Overview 275
- Device Drivers 275
- Trace Formatting 276
- Device-Dependent Subroutines 278
- Managing Dumps 279
- Return Values 283
- Configuration Issues 286
- Multiple Adapters 287
- Device Attributes 290
- Error Conditions 294
- Special Files 296
- Operation 301
- Device Driver Entry Point 307
- SSA Disk Fencing 310
- SSA Target Mode 311
- Buffer Management 313
- Using SSA Target Mode 314
- SSA tmssa Device Driver 315
- Configuration Information 316
- are not applicable 317
- Implementation Specifics 324
- Related Information 324
- Installing the SSA Adapter 333
- Cron Table Entries 333
- Microcode Maintenance 334
- Exchanging Disk Drives 339
- 5. Refer to Figure 47 353
- Advanced SerialRAID Adapter 356
- 6. Refer to Figure 51 357
- Part Numbers 360
- Required Flags for Both Modes 382
- Required Flags for Copy Mode 382
- Optional Flags for List Mode 382
- Optional Flags for Copy Mode 383
- Chapter 17. SSA Service Aids 393
- The Identify Function 395
- Starting the SSA Service Aids 396
- Set Service Mode Service Aid 398
- Link Verification Service Aid 403
- Format Disk Service Aid 409
- Certify Disk Service Aid 411
- Link Speed Service Aid 416
- Example 1. Normal Loops 421
- The SRN Table 431
- Using the SRN Table 431
- Software and Microcode Errors 461
- How to Use the MAPs 463
- MAP 2010: START 464
- MAP 2320: SSA Link 465
- NO Go to step 5 on page 448 467
- MAP 2324: SSA RAID 474
- SSA Link Errors 498
- SSA Subsystem 499
- SSA Subsystem SSA Subsystem 500
- Link Status (Ready) Lights 501
- Service Aid 502
- Repair Actions 502
- Part 3. Appendixes 503
- Anmerkung: 507
- Glossary 509
- Glossary 491 511
- Numerics 513
- Part Number: 27H0678 530
- Printed in the U.S.A 530
- SA33-3285-02 530
- (1P) P/N: 27H0678 530
- Spine information: 531
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