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ECSA Requirement

During initialization, the LAM Subsystem acquires storage from the Extended Common Service Area (ECSA) to contain the anchor points for control blocks. You can compute ECSA space for the LAM Subsystem using the following formula:

ESCA bytes equals ((MAXUSER plus 1) times 4) =
     876 +((number of wide record master file - 17) * 48)

The MAXUSER parameter is defined in the IEASYSxx member of SYS1.PARMLIB.