We are running Oracle RDB on VMS 6.2-1H3 on an Alpha Server 1000 cluster with a HSZ50 controlled StorageWorks Raid for 2 years now. Before that we had the database running for 8 years on a VAX system. We plan to upgrade to VMS 7.x in the near future.
Downtimes happen about once a year.
The cause of that problem could lay in application software design. Unfortunately we produced no dump file for further investigation. We can live with one hour downtime once a year.