It should actually work to spcify them both as /archive since its 2 different physical paths. A clue to what the issue could be is to check in debugfile.
I have problems creating the log to.
I have set the config the way it should but for some reason there is no log file created.
When doing a search i get "Unable to read search logfile"
have you scheduled as the manual says?
you can also test it by making searchlog a command and trigger it via site command:
createsearchlog = EXEC ..\scripts\ioA\ioA.exe SEARCHLOGCREATE