Single Cluster with Mirrored NSS Volumes in Separate Buildings
NSS mirroring is intended as a solution for remote mirroring in installations where disaster recovery is required. If you have a regular RAID drive array, we recommend using hardware-powered drive redundancy instead of NSS mirroring.
Hardware configuration and placement for NSS mirroring can vary depending on geography and fault tolerance requirements. For example, the following figure depicts a simple hardware configuration in which one side of the mirrored NSS volume is located in a separate building from the rest of the cluster hardware. Should a disaster occur in one building, data would still be safe on the mirrored NSS volume in the other building.
Figure 1
Single Cluster with Mirrored NSS Volumes in Separate Buildings
The following figure depicts a more complex hardware configuration in which two clusters are placed in separate buildings, but each has one side of a mirrored NSS volume in the building with the other cluster. Should a disaster occur in one building, data would still be safe and immediately accessible on the mirrored NSS volume in the other building.
Figure 2
Two Clusters with Mirrored NSS Volumes in Separate Buildings