Before you can use a data set in RLS access mode, you must ensure that it is eligible. To be eligible for RLS:
You can specify a data set's attributes using the Access Method Services (AMS) DEFINE CLUSTER or ALTER CLUSTER commands.
Specifying a LOG parameter of NONE, UNDO or ALL ensures that the recoverability of the data set is not undefined. You cannot open files in RLS mode if the LOG parameter of the associated data set is UNDEFINED. If you specify LOG(ALL), you must also specify a forward recovery log stream on the LOGSTREAMID parameter.
To use backup while open (BWO) for an RLS-accessed sphere, specify the BWO parameter. Specifying BWO(TYPECICS) means that backup while open can be used. All other values for BWO (including undefined) mean backup while open is not allowed. BWO(TYPECICS) is only valid if LOG(ALL) and LOGSTREAMID are also specified.
If you have some data sets that specify imbed, you must remove the IMBED option before you can use the data sets in RLS mode. Redefine a new data set without IMBED and use the AMS REPRO function to copy the old data set to the new data set.