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Consider the following scenario: You install a Microsoft SQL Server 2008 failover cluster in disk that contains a mounted volume. After the installation is complete, the mounted volume and the disk are added to the SQL Server cluster resource group. However, no dependencies are set between the mounted volume and the disk.
If no dependency exists between the mounted volume and the disk, data corruption may occur on failover. To prevent this kind of corruption, you must manually create a dependency between the mounted volume and the disk.
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(http://technet.microsoft.com/en-us/library/dd630735.aspx)Additionally, each mounted volume must also be added as a SQL Server dependency. If only the root physical disks dependency is added and the mounted volumes are not added, database corruption will occur on failover.