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Contents
6.4 Read-ahead Cache..........................................................................................6-13
6.4.1 Data buffer structure ..........................................................................6-13
6.4.2 Caching operation..............................................................................6-14
6.4.3 Using the read segment buffer ...........................................................6-16
6.5 Write Cache....................................................................................................6-20
6.5.1 Cache operation .................................................................................6-20
CHAPTER 7 Maintenance and Diagnosis .....................................................7-1
7.1 Maintenance .....................................................................................................7-2
7.1.1 Rules for maintenance..........................................................................7-2
7.1.2 Maintenance requirements...................................................................7-3
7.1.3 Maintenance levels...............................................................................7-5
7.1.4 Disk drive revision number..................................................................7-6
7.1.5 Tools and test equipment .....................................................................7-8
7.1.6 Self-diagnostics....................................................................................7-8
7.1.7 Test.......................................................................................................7-8
7.2 Operation Confirmation .................................................................................7-11
7.2.1 Operation test.....................................................................................7-11
7.2.2 Diagnostic test....................................................................................7-11
7.3 Troubleshooting Procedure ............................................................................7-12
7.3.1 Troubleshooting procedure................................................................7-12
7.3.2 Troubleshooting disk drive replaced in field .....................................7-12
7.3.3 Troubleshooting at factory.................................................................7-14
7.4 Disk Drive Removal Procedure......................................................................7-15
7.5 Spare Disk Drive ............................................................................................7-15
Glossary ...........................................................................................................GL-1
Acronyms and Abbreviations.........................................................................AB-1
Index ................................................................................................................. IN-1
xiv C141-E280