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File control quiesce receive exit, XFCVSDS
The XFCVSDS exit is invoked when VSAM RLS notifies CICS that processing is
required as a result of some data set-related events occurring in the sysplex.
XFCVSDS is invoked
before
CICS processing takes place, and only if a data set
name block (DSNB) exists for the data set. The actions that cause XFCVSDS to be
invoked are:
v A data set is being quiesced throughout the sysplex.
CICS is informed about this action only if it has files open in RLS mode against
the data set.
If CICS is notified about a quiesce action, the XFCVSDS global user exit
program can cancel the data set quiesce, in which case it cancels the quiesce
throughout the sysplex, and the data set remains in the unquiesced state.
v A data set is being unquiesced throughout the sysplex.
All CICS regions in the sysplex that are registered with a VSAM RLS control ACB
are informed about unquiesce actions.
v DFSMSdss wants to start a non-BWO backup of a data set.
CICS is notified about a non-BWO backup start action only if it has files open in
RLS mode against the data set.
If CICS is notified about a non-BWO backup start action, XFCVSDS can be used
to cancel the backup.
v DFSMS™ has completed a non-BWO backup of a data set.
All CICS regions in the sysplex that are registered with a VSAM RLS control ACB
are informed about non-BWO backup complete actions.
v DFSMS wants to start a BWO backup of a data set.
CICS is notified about a BWO backup start action only if it has files open in RLS
mode against the data set.
If CICS is notified about a BWO backup start action, XFCVSDS can be used to
cancel the backup.
v DFSMS has completed a BWO backup of a data set.
All CICS regions in the sysplex that are registered with a VSAM RLS control ACB
are informed about BWO backup complete actions.
file control quiesce receive exit
Chapter 1. Global user exit programs 107