It is possible to use MS cluster with Oracle Fail Safe without, but in this case, you will need:
1)identify additional resources needed Oracle (discs)
2)determine the order of services to start Oracle
3)to replicate the installation of the registry and other configuration of your Oracle installation, etc.
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Oracle Fail Safe, for example, when adding a database to a group, automatically adds the same group of drives depends on the database, and determines that the disks should be available before running the database. In a planned failover, Oracle Fail Safe performs a checkpoint.
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Oracle Fail Safe also has a command line interface that can be used, e.g. backup scripts.
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As I recall, if you use FailSafe it automatically launch and configure services, and verway node (provided that there is installed). To minimize downtime I recommend to use the circuit Active/Passive in a cluster.
This configure will not prompt, do not remember, but there is a manual:
download.oracle.com/docs/html/A96685_01/toc.htm