StorageTek 6 manual Control Data Set Recovery Scheme

Figure 24 illustrates the built-in recovery scheme for the control data sets.

INITIAL		AT FAILURE OF
CONTROL		PRIMARY CONTROL
DATA SET		DATA SET, HSC
CONFIGURATION		OPERATES ON
		SECONDARY DATA SET
		STANDBY DATA SET
		IS MADE VALID
		FOR USE
		-
	-	FAILED
		DATA SET
		1

AT FAILURE OF THE SECONDARY CONTROL

DATA SET, THE HSC OPERATES ON THE STANDBY DATA SET PROVIDED THAT STANDBY DATA SET WAS OPERATIONAL

-

-FAILED

DATA SET

2

	PRIMARY CONTROL DATA SET
HSC
EXECUTION	CONTROL	CONTROL
CONTROL
DATA SET	DATA SET	DATA SET
1	2	3
	SECONDARY CONTROL DATA SET
CONTROL	CONTROL
DATA SET	DATA SET
2	3

STANDBY CONTROL DATA SET

CONTROL DATA SET 3

JOURNAL JOURNAL JOURNAL

JOURNAL JOURNAL JOURNAL

C29343

Figure 24. Control Data Set Recovery Scheme

Chapter 5. Problem Determination, Diagnostics, and Recovery 387

1st ed., 6/30/04 - 312579601