You can specify the -v option with the asmcmd command to display additional information with some commands to help users diagnose problems as shown in the following example:
$ asmcmd -v debug
When there is a message that must be logged during asmcmd operations, the message is written to the alert.log file or the trace.trc file.
The alert.log file is created or updated when asmcmd is started with the -v errors, -v warning, or -v normal display level. The trace.trc file is created or updated when asmcmd is started with the -v info or -v debug display level.
By default, the alert.log is file created in the $ORACLE_HOME/log/diag/asmcmd/user_username/hostname/alert/ directory. By default, the trace.trc file is created in the $ORACLE_HOME/log/diag/asmcmd/user_username/hostname/trace/ directory.
Under certain circumstances, $ORACLE_BASE and $ORACLE_HOME can be set to override the default locations of the alert.log and trace.trc files.