Datacom MUF gets DB01004E - PXX AREA I/O ERROR at shutdown

Products

• Datacom
• DATACOM - AD

Issue/Introduction

Datacom Multi-User Facility (MUF) region is correctly shut down and the DBMUFPR step returns RC 0 but a SNAP dump (ID=20) is generated on the MUF job log while the following messages can be found on the JESMSGLG:
DB01004E - PXX AREA I/O ERROR  
DB01001W - PXX AREA FULL       
DB00202I - MULTI-USER DISABLED 

Environment

Datacom/DB or Datacom/AD 14.0 and above

Cause

The errors are returned because the PXX dataset is shared with another MUF region (a member of the same MUFPLEX, a shadow MUF or a completely different one) .

Resolution

Each region must have its own PXX and this dataset cannot be shared with any other Datacom MUF region. Or you start DBMUFPR with PARM='NO_PXX' . 
This requirement is stated in Implementing Datacom Shadow MUF