IPLOG file filled up and could not be automatically extended by NetMaster because of these error messages:
IEC070I 034(004)-220,jjj,sss,IPLOG,dev,volser, IEC070I hlq.IPLOG, IEC070I hlq.IPLOG.D,cat IPLO8103 ssss IPLOG I/O ERROR, LOGGING HAS STOPPED, EXTRACT DATA AND RESET NDBNM3040 NCLID 000257: $IPLO81Z 886 ERROR 4 COND TYPE_ERROR
Per IBM documentation, RC 034 SFI 004 means:
End of volume - Non-extended addressable. The new allocation amount would exceed 4 GB.
IPLOG is allocated on a SMS class that doesn't support extended addressability
NetMaster usually automatically recovers IPLOG running a reorg. If you want to use extended format for IPLOG, allocate it using a SMS class that allows extended format.
See also How to rebuild the Netmaster IPLOG article