The campus cluster storage configuration for SQL Server is similar to the high availability storage configuration.

See Sample SQL Server high-availability cluster storage configuration.

Note that in a campus cluster each disk group spans the storage arrays at both sites. The data and database log on Site A are mirrored to Site B. Each mirrored volume can have more than two disks, but must have an even number, such as four. All the application data could be in one large mirrored volume with multiple disks, but the same number of disks are required on both sites for the mirroring.

A four-way mirror for the quorum volume provides additional redundancy. The minimum configuration would be a two-way mirror. If possible, use small disks for the quorum volume. Microsoft recommends 500 MB for the quorum volume.

The following figure shows an example campus cluster storage configuration in a Microsoft cluster environment.