You observe that logging entries are no longer being written out to the db2diag.log file.
The following error message is reported in the <instance>.nfy log
ADM14000E DB2 is unable to open diagnostic log file
"/db2/<SID>/db2dump/db2diag.log". Run the command "db2diag -rc "0x870f0016"" to find out more.
and the following warning message is repeated throughout the OS syslog
Open of log file "db2dump/db2diag.log" failed with rc 0x870F0016#Process ID: 58614#012Process name: db2sysc 0#012EDU ID: 23311#012EDU name: db2agent
DB2 LUW 9.1 and later
CLP session connection reset peer hang SQL0902C file permission , KBA , BC-DB-DB6 , DB2 Universal Database for Unix / NT , Problem
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