DFS2450I UNABLE TO ACQUIRE STORAGE FOR ENQ/DEQ BLOCKS, REASON=n

Explanation

Module DFSFXC10 was unable to acquire a block of storage for queuing control blocks. The reason codes n provide further details:
Code (dec)
Meaning
0
A block was requested that is not the first block. The amount of storage that was specified by the PIMAX parameter has not been exhausted, but a GETMAIN for another block of storage was unsuccessful. If the failure was on an attempt to acquire the last block, this message is accompanied by message DFS2451W.
8
There is no storage available for the first ENQ/DEQ block. A standard abend occurs.

System action

If the request was for the first block, the system is terminated abnormally with abend 0775. For other blocks, the task is pseudoabended with abend 0775.

System programmer response

Code
Response
0 & 8
IMS LSO=N
Increase CSA size
IMS LSO=Y or X
Increase control region local storage size
IMS LSO=S
If your system is using Fast Path, increase the ECSA size. If the system is not using Fast Path, then increase the DLI/SAS region local storage size.

If there are one or more BMPs that have updates running at the time of the failure, then have the BMPs issue checkpoints. Alternatively, if they already do, have them issue the checkpoints more frequently.