"nova show" command doesn't retrieve all the log records from table instance_faults

I am designing the log window (see below) for titan to show the error log for an instance. When the instance is fail to start, i can use “nova show” to get the error message, but the message is only the last record of table instance_faults, so the log message is not complete. Any openstack command can retrieve all the log records from table instance_faults for a specific instance?

Log window
Log window