/usr/lpp/mmfs/bin/mmcommon notifyOverload will not cause tracing to be started. One can verify that using the underlying command being called as shown in the following example with /tmp/n containing node names one each line that will get the notification and the IP address being the file system manager from which the command is issued.
/usr/lpp/mmfs/bin/mmsdrcli notifyOverload /tmp/n 1191 192.168.117.131 3 8 The only case that deadlock detection code will initiate tracing is that debugDataControl is set to "heavy" and tracing is not started. Then on deadlock detection tracing is turned on for 20 seconds and turned off. That can be tested using command like /usr/lpp/mmfs/bin/mmsdrcli notifyDeadlock /tmp/n 1191 192.168.117.131 3 8 And then mmfs.log will tell you what's going on. That's not a silent action. 2018-03-12_10:16:11.243-0400: [N] sdrServ: Received deadlock notification from 192.168.117.131 2018-03-12_10:16:11.243-0400: [N] GPFS will attempt to collect debug data on this node. 2018-03-12_10:16:11.953-0400: [I] Tracing in overwrite mode <== tracing started Trace started: Wait 20 seconds before cut and stop trace 2018-03-12_10:16:37.147-0400: [I] Tracing disabled <== tracing stopped 20 seconds later mmtrace: move /tmp/mmfs/lxtrace.trc.c69bc2xn01.cpu0 /tmp/mmfs/trcfile.2018-03-12_10.16.11.2982.deadlock.c69bc2xn01.cpu0 mmtrace: formatting /tmp/mmfs/trcfile.2018-03-12_10.16.11.2982.deadlock.c69bc2xn01 to /tmp/mmfs/trcrpt.2018-03-12_10.16.11.2982.deadlock.c69bc2xn01.gz > What's odd is there are no log events to indicate an overload occurred. Overload msg is only seen in mmfs.log when debugDataControl is "heavy". mmdiag --deadlock shows overload related info starting from 4.2.3. # mmdiag --deadlock === mmdiag: deadlock === Effective deadlock detection threshold on c69bc2xn01 is 1800 seconds Effective deadlock detection threshold on c69bc2xn01 is 360 seconds for short waiters Cluster c69bc2xn01.gpfs.net is overloaded. The overload index on c69bc2xn01 is 0.01812 <==
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