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388 VM/HSC 6.0 System Programmer’s Guide
1st ed., 6/30/04 - 312579601
All HSCs in operation must be stopped to perform the restore operation.
If the three control data sets fail, the journal(s) can be used to restore a valid control data
set.
Refer to “Backup Utility” on page 211 for detailed information about running the
BACKup utility. Refer to “Restore Utility” on page 276 for detailed information about
running the RESTore utility.
Control Data Set Error Diagnostics
Numerous messages are provided to permit you to diagnose problems pertaining to the
control data sets. The messages describe error circumstances including:
• block mismatches between copies of the control data sets
• missing DD statements required for control data set initialization
• various backup and restore actions
• discrepancy block information, and other pertinent diagnostic information.
Refer to the HSC Messages and Codes Guide for more information about messages
encountered that pertain to the control data sets and the BACKup and RESTore utilities.
Control Data Set Processes
Several important processes are available to you for recovery purposes. These are
designed to permit you to keep your library running when there are apparent problems
with the primary control data set. Processes include how to:
• initialize and run the HSC on one copy of the control data set
• switch to any backup copy of the control data set
• switch the control data set in a multi-host environment.
Initializing/Running the HSC on One Copy of the Control Data Set
You have the option of initializing and running the HSC on only one copy of the control
data set. With the available PARMLIB control statements, you can specify secondary and
standby control data sets; however, if for any reason, the HSC can run on only one of the
control data sets, the HSC continues to run normally.
The HSC has the capability of determining which of any number of control data sets are
valid and consequently chooses a valid data set with which to continue operation.
It is highly recommended that you initialize, in addition to the primary control data set, a
secondary and a standby control data set. With these data sets, you can recover from
problems with the primary control data set.