A CA Vtape Subsystem is a main address space and multiple subaddress spaces. To clear error conditions that can cause product outage, you can restart subaddress spaces individually. If maintenance is applied, the link list is changed, or the CA Vtape PROCs are changed, a subaddress space could be restarted with a different code level than the other address spaces in the subsystem.
The Split Maintenance-Level Protection feature addresses the problem. When this feature is active, all module PTF levels are reviewed for incompatibilities during a subaddress space restart. If discrepancies are found, warning messages are displayed.
If the Automatic or Library modes of this feature are selected during startup, the CA Vtape load modules are copied to a private library. This library is used to start and restart the subaddress spaces. This effectively freezes the runtime code maintenance level to prevent any changes from being introduced until the subsystem is restarted.
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