I've the same problem. "export_dir": "/storage/updatemgr/migration" setting on .json file didn't work. I created "migration" folder before the upgrade.
The log shows:
Running precheck: RecommendOrCheckExportDirTask execution failed
Error message: Not enough disk space on '/' for exporting source data 19.34 GB
including migrate set 'all' in export_dir '/storage/updatemgr/migration'.
Any idea how to point exporting source data to "/storage/updatemgr/migration" ?
Jouni
