Here is a sequence that repeats for hours in the system log (console) I will see whether this goes away after disconnecting the TM disk.
Oct 14 14:42:41 gallix syslogd[157]: ASL Sender Statistics
Oct 14 14:43:15 gallix AMPDeviceDiscoveryAgent[1020]: Entered:_AMMuxedDeviceDisconnected, mux-device:192
Oct 14 14:43:15 gallix AMPDeviceDiscoveryAgent[1020]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:192
Oct 14 14:44:17 gallix AMPDeviceDiscoveryAgent[1020]: Entered:_AMMuxedDeviceDisconnected, mux-device:193
Oct 14 14:44:17 gallix AMPDeviceDiscoveryAgent[1020]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:193
Oct 14 14:44:47 gallix AMPDeviceDiscoveryAgent[1020]: Entered:_AMMuxedDeviceDisconnected, mux-device:194
Oct 14 14:44:47 gallix AMPDeviceDiscoveryAgent[1020]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:194
Oct 14 14:47:05 gallix AMPDeviceDiscoveryAgent[1020]: Entered:_AMMuxedDeviceDisconnected, mux-device:195
Oct 14 14:47:05 gallix AMPDeviceDiscoveryAgent[1020]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:195
Oct 14 14:47:14 gallix AMPDeviceDiscoveryAgent[1020]: Entered:_AMMuxedDeviceDisconnected, mux-device:196
Oct 14 14:47:14 gallix AMPDeviceDiscoveryAgent[1020]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:196
Oct 14 14:48:38 gallix AMPDeviceDiscoveryAgent[1020]: Entered:_AMMuxedDeviceDisconnected, mux-device:197
Oct 14 14:48:38 gallix AMPDeviceDiscoveryAgent[1020]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:197
Oct 14 14:49:22 gallix AMPDeviceDiscoveryAgent[1020]: Entered:_AMMuxedDeviceDisconnected, mux-device:198
Oct 14 14:49:22 gallix AMPDeviceDiscoveryAgent[1020]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:198
Oct 14 14:49:54 gallix AMPDeviceDiscoveryAgent[1020]: Entered:_AMMuxedDeviceDisconnected, mux-device:199
Oct 14 14:49:54 gallix AMPDeviceDiscoveryAgent[1020]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:199
Oct 14 14:52:20 gallix AMPDeviceDiscoveryAgent[1020]: Entered:_AMMuxedDeviceDisconnected, mux-device:201
Oct 14 14:52:20 gallix AMPDeviceDiscoveryAgent[1020]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:201
Oct 14 14:53:28 gallix AMPDeviceDiscoveryAgent[1020]: Entered:_AMMuxedDeviceDisconnected, mux-device:200
Oct 14 14:53:28 gallix AMPDeviceDiscoveryAgent[1020]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:200
Oct 14 14:53:28 gallix syslogd[157]: ASL Sender Statistics