DFS1278E LUMx POOL LIMIT REACHED, ALL APPC INPUT WILL BE REJECTED.

Explanation

The LUMP or LUMC storage pool has less than 1 MB of free storage. In the message text, x can be either P or C.

System action

IMS tells APPC/MVS to reject all advanced program-to-program communication (APPC) input until the pool has more than 5 MB of storage. APPC input that is already processing can continue.

Programmer response

Check whether there are any stopped resources that prevent executing transactions. Make sure no client floods IMS with transactions. Consider specifying a larger LUMP or LUMC pool limit.