virt-v2v does not provide any option to store the output/traces/debug messages to a log file. Also since the traces are scattered between stdout and stderr one has to first merge the streams to get any useful log (https://bugzilla.redhat.com/show_bug.cgi?id=1364053). Such option would simplify situations when virt-v2v is not run manually from command line, but is used in some other tool.
This product has been discontinued or is no longer tracked in Red Hat Bugzilla.
Reopening because Virtualization Tools has not been discontinued.