SQL Server 2005 supports mount points in cluster...

BOL SQL 2005 ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/udb9/html/a655225d-8c54-4b30-95fd-31f588167899.htm

  • SQL Server 2005 supports mount points; the clustered installations of SQL Server are limited to the number of available drive letters. Assuming that you use only one drive letter for the operating system, and all other drive letters are available as normal cluster drives or cluster drives hosting mount points, you are limited to a maximum of 25 instances of SQL Server per server.

    A mounted volume, or mount point, allows you to use a single drive letter to refer to many disks or volumes. If you have a drive letter D: that refers to a regular disk or volume, you can connect or "mount" additional disks or volumes as directories under drive letter D: without the additional disks or volumes requiring drive letters of their own.

    Special mount point considerations for SQL Server 2005 failover clustering:

    • SQL Server Setup requires that the base drive of a mounted drive has an associated drive letter. For failover cluster installations, this base drive must be a clustered drive.
    • The base drive, the one with the drive letter, cannot be shared among virtual servers. This is a normal restriction for virtual servers, but is not a restriction on stand-alone, multi-instance servers.
    • Take extra care when setting up your virtual server to ensure that both the base drive and the mounted disks or volumes are all listed as resources in the resource group. SQL Server Setup does not take care of this automatically, nor does SQL Server check for this during CREATE/ALTER DATABASE.
    • Ensure that the mounted disks or volumes are mounted under the correct lettered base drive, and make sure that the mounted drive is set to be dependent on the parent drive.