I'm trying to plan the SQL data and log file locations within a new SAN. I have a few databases that are hardly used at all. They are mainly metadata repositories for applications that run once or twice a day, so there is essentially zero load on them at any given time. Performance will not be an issue.
For simplicity's sake, I was thinking of just placing the data and log files on the OS drive (C:) instead of creating more LUNs on the SAN. Assuming that the C:\ drive has adequate RAID fault-tolerance, is there any reason this should not be done?