DFS3620I REQUIRED RESOURCE UNAVAILABLE - RC=uu - FC=vv RESOURCE ID=xxxxxxxx - SUBSYS NAME = yyyy - JOBNAME = zzzzzzzz.

Explanation

The IMS system encountered a resource constraint while processing a request to connect to an external subsystem.

The following values for the return code (RC-uu), function code (FC-vv), resource ID-xxxxxxxx, subsys name-yyyy and jobname-zzzzzzzz are defined:
uu
The return code is passed back to the caller. For information about return codes and function codes, see the IMS Return code and function code information.
vv
The function code indicates the module name that encountered the problem. For information about return codes and function codes, see the IMS Return code and function code information.
xx..xx
The resource ID indicates that a resource was required but could not be obtained or was nonexistent. The possible values are:
GESE
Indicates that the external subsystem, to which IMS was attempting to connect, did not have an external subsystem entry defined in the subsystem PROCLIB member specified in the control region JCL or the procedure (SSM=). IMS allows different SSM values to be specified, each containing a different subsystem definition for the control and dependent regions (MPP, BMP, IFP). However, a connection is attempted by IMS only for those PROCLIB members specified in the control region. The PROCLIB member which is specified by the SSM parameter for the region (indicated by JOBNAME), contains a subsystem definition that did not exist in the control region.
AWE
Indicates that an IMS module was unable to acquire an asynchronous work element (AWE) to initialize processing.
yyyy
Indicates the subsystem where the connection failed.
zzzzzzzz
Indicates the region where the connection failed. The PROCLIB member specified using the SSM parameter for this region contains a subsystem definition which is not contained in the control region member.

System action

The attempt to connect to the external subsystem is stopped, and this message is issued to assist in determining the problem.

Operator response

Notify the system programmer.

Programmer response

The installation action is dependent upon the resource ID. Take one of the following actions, dependent upon the resource ID.
GESE
If you want to connect to the external subsystem, then add the subsystem definition to the control region subsystem PROCLIB member.
AWE
Increase the size of the shareable storage (CSA) by 4 K increments until IMS runs successfully.