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Chapter 5. Problem Determination, Diagnostics, and Recovery 387
1st ed., 6/30/04 - 312579601
Figure 24 illustrates the built-in recovery scheme for the control data sets.
CONTROL
DATA SET
1
CONTROL
DATA SET
2
PRIMARY CONTROL DATA SET
SECONDARY CONTROL DATA SET
STANDBY CONTROL DATA SET
CONTROL
DATA SET
3
DATA SET
1
DATA SET
2
CONTROL
DATA SET
2
CONTROL
DATA SET
3
CONTROL
DATA SET
3
JOURNAL
JOURNAL
JOURNAL
JOURNAL
JOURNAL
JOURNAL
HSC
EXECUTION
INITIAL
CONTROL
DATA SET
CONFIGURATION
AT FAILURE OF
PRIMARY CONTROL
DATA SET, HSC
OPERATES ON
SECONDARY DATA SET
STANDBY DATA SET
IS MADE VALID
FOR USE
AT FAILURE OF THE
SECONDARY CONTROL
DATA SET, THE HSC OPERATES
ON THE STANDBY DATA SET
PROVIDED THAT STANDBY
DATA SET WAS OPERATIONAL
- FAILED -
- FAILED -
C29343
Figure 24. Control Data Set Recovery Scheme