Fail Over cluster on Windows Server 2008r2 and Oracle Fail Safe Manager

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Faced with the task of setting the project on a Fail Safe cluster on the following tools: Windows Server 2008 (already configured a Fail Over cluster of two nodes) and 11g2 Oracle Standard Edition One.

As far as I understand, Fail Over OS-level must deal with starting and stopping services. Why, then, provides a special tool Oracle Fail Safe Manager? if you want to put the utility for the database?

Strictly speaking, the utility of the nodes I already have, but did not understand a bit, why specify an additional layer of abstraction over the cluster OS: virtual addresses, and more.

I would be grateful for tips for installing Oracle on a cluster as a whole.
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Oracle Fail Safe — BY integrating with Windows Faiover cluster, which monitors and migrates the database in the event of failure of the nodes, the cluster recovers after a return of one of the nodes, etc. simply put, it is the cluster at the OS level, and the level of the Oracle database.
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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
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Hmm, and what kind of shared storage? Obviously it kroese and now the problem )
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