DFSIOTCK
DFSIOTCK (in source module DFSGGSP0) is a CSECT within the DL/I space management load module DFSDHDS0. It determines if MVS I/O toleration is required. I/O toleration is required in an IMS XRF environment when the host standby system is in the process of a takeover and is currently performing database backouts as a result of the takeover.
Hints
For performance considerations for CSECT DFSIOTCK, please refer to module DFSDHDS0.
Reference Sources
More information is available in the IMS DBSOURCE Library Data Set. See your IMS system programmer.