Finding the CRS resource last modified or started will be very clumpsy when you look at crsd.log or any other logs.
For that use -v flag in crsctl status resource command where you can find some important details like last server , last changed, last restart, internal status etc.
For example:-
[grid@node1 ~]$ crsctl status resource ora.mydb.test_srv.svc -l NAME=ora.mydb.test_srv.svc TYPE=ora.service.type CARDINALITY_ID=1 DEGREE_ID=1 TARGET=OFFLINE STATE=OFFLINE CARDINALITY_ID=2 DEGREE_ID=1 TARGET=ONLINE STATE=ONLINE on node1
[grid@node1 ~]$ crsctl status resource ora.mydb.test_srv.svc -v NAME=ora.mydb.test_srv.svc TYPE=ora.service.type LAST_SERVER=node2 STATE=OFFLINE TARGET=ONLINE CARDINALITY_ID=1 CREATION_SEED=137 RESTART_COUNT=0 FAILURE_COUNT=0 FAILURE_HISTORY= ID=ora.mydb.test_srv.svc 1 1 INCARNATION=5 LAST_RESTART=08/10/2011 16:32:53 LAST_STATE_CHANGE=08/10/2011 16:34:03 STATE_DETAILS= INTERNAL_STATE=STABLE
-Thanks
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