CA Vtape allows its subaddress spaces to be restarted to clear error conditions that might otherwise cause a product outage. When this feature is active, the PTF levels of all modules will be reviewed when any subaddress space is restarted.
This ability also presents a challenge when applying maintenance. A subaddress space could be restarted using a different maintenance level than that of the other subaddress spaces. This is particularly problematic when PTFs have inter-module dependencies.
This problem is addressed by the Split Maintenance-Level Protection feature. Except when this feature is specifically disabled, during the restart of any subaddress space the PTF levels of all modules will be reviewed for any incompatibilities. If any discrepancies are found, warning messages will be displayed. Further, if Automatic or Library modes are selected to permit CA Vtape to manage the runtime loadlib, during startup the CA Vtape load modules will be copied at subsystem startup to a private library. This library will be used to start and restart the subaddress spaces. This effectively freezes the PTF level of the runtime code to prevent any changes from being introduced until CA Vtape is restarted.
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