Options for Initiating Duplexing Rebuild

The DUPLEX option in the CFRM policy allows you to specify for each structure how the initiation of duplexing rebuild is to be handled:

DUPLEX(DISABLED) — Duplexing rebuild is not allowed. If a duplexing rebuild is in progress for the structure at the time the CFRM policy changes to DUPLEX(DISABLED), MVS™ will automatically attempt to stop the duplexing rebuild and fall back to the old structure.
DUPLEX(DISABLED) is the default.
DUPLEX(ALLOWED) — Duplexing rebuild is allowed to be manually established through the SETXCF operator command or the IXLREBLD macro, but will not be automatically initiated by MVS.
DUPLEX(ENABLED) — Duplexing rebuild is allowed for both manual initiation and automatic initiation by MVS. If duplexing rebuild is not in progress at the time the CFRM policy changes to DUPLEX(ENABLED), MVS may start a duplexing rebuild.

Note that changes to the CFRM policy that affect the DUPLEX option will always take effect immediately. If the structure is allocated at the time of the CFRM policy change, the DUPLEX option will not be made pending. Any duplexing rebuild actions that are required because of the CFRM policy change will take effect immediately.