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Contents
xiv C141-E262
6.3.1 Power save mode of the interface .........................................................6-11
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