Well given the lack of responses I went with trial and error. The end result is that I have migrated 32bit splunk to a new 64bit server. This was achieved by stopping the splunk services, backing up the splunkdb folder (I have it on a separate drive) and program files folders, building the new server, installing a vanilla splunk installation on the new server, stopping the splunk services and then copying the splunkdb and program files folders over the new installation. Then restart the services.
I still want to migrate from 32bit to 64bit but this can wait for another day.
... View more