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This article discusses issue that you must consider when you use mounted folders together with versions of Microsoft SQL Server in stand-alone and clustered environments. The availability of support for mounted folders depends on the version of SQL Server and on whether the instance of SQL Server is a stand-alone or clustered instance:.

Note Mounted folders are also known as any of the following:. However, the SQL Server Setup program requires the base drive of a mounted drive to have an associated drive letter. If the base drive of a mounted drive does not have an associated drive letter, the Setup program will assign the next available drive letter to the drive. Note If all the drive letters are already assigned, the Setup program will fail.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:. The clustered installations of SQL Server are limited to the number of available drive letters. Therefore, if you use only one drive letter for the operating system, and if all other drive letters are available as normal cluster drives or as cluster drives that are hosting mount points, you are limited to no more than 25 instances of SQL Server per failover cluster.

A mounted volume, or mount point, lets you to use a single drive letter to refer to many disks or volumes. For example, if you have a drive letter R: that refers to a regular disk or volume, you can connect or "mount" additional disks or volumes as directories under drive letter R: without the additional disks or volumes requiring drive letters of their own. Additional mount point considerations for SQL Server failover clustering include the following:.

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. Volume GUIDs are not supported in this release. The base drive is the drive that is assigned the drive letter. The base cannot be shared among failover cluster instances.

This is a usual restriction for failover clusters but is not a restriction on stand-alone, multi-instance servers. Be careful when you set up your failover cluster to make sure that both the base drive and the mounted disks or volumes are listed as resources in the resource group.

SQL Server Setup validates drive configuration as part of a failover cluster installation. Note As a best practice, do not use the letters A or B for a cluster. However, this reduces the number of possible instance to 23 instances per cluster. Mount points and the host drive must be displayed as a cluster physical disk resource.

Additionally, the physical disk that has a drive letter and each mounted volume must also be added as a SQL Server dependency. If you perform a new installation, the correct dependency permissions are set on the physical disks that have an associated drive letter and on the mount points.

The dependency permissions are set automatically during setup. This includes the cumulative update and the required service pack. Important If you use a merged slipstream, that version of the slipstream must remain available in its original location as long as the instance of SQL Server exists.

Additionally, you must set the correct dependencies in installations that are missing the required dependencies. If only the root physical disks dependency is added and the mount points dependency is not added, database corruption will occur on failover. Database corruption may also occur during a SQL Server restart should disk resources go offline and return to online state even without failing over.

Warning If you previously installed SQL Server to a root directory, you may be unable to install service packs or cumulative updates. Cluster Shared Volumes. Create a dependency in the mounted volume disk resource that specifies the disk that is hosting the mount point folder.

This makes the mounted volume dependent on the host volume, and it makes sure that the host volume comes online first. Note In Windows Server and later versions of Windows, this practice is no longer necessary. If you move a mount point from one shared disk to another shared disk, make sure that the shared disks are located in the same group.

Try to use the root host volume exclusively for mount points. The root volume is the volume that hosts the mount points. This practice greatly reduces the time that is required to restore access to the mounted volumes if you have to run the Chkdsk. This also reduces the time that is required to restore from backup on the host volume. If you use the root host volume exclusively for mount points, the size of the host volume must be at least 5 megabytes MB. This reduces the probability that the volume will be used for anything other than the mount points.

For more information about mounted drives, click the following article numbers to view the articles in the Microsoft Knowledge Base:. Need more help? Expand your skills.

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