Strategies for Data Protection - Brocade

Highly Available StorageFigure 11, alternate pathing can be configured as Fabrics A and B,which provide each server with a primary and secondary path to storageassets.Figure 11. Providing alternate paths from servers to storageIn this example, the failure of a storage port on the array or any link orport through Fabric A would still allow access through Fabric B. Withboth sides active in normal operation, though, each individual serversees two separate images of the same storage target: one from the Aside and one from the B side. A mechanism is therefore required toreconcile this side effect of dual pathing and present a single image ofstorage to the initiator. Typically, this reconciliation is performed by adevice driver installed on the host. The driver may include the additionalability to load balance between alternate paths to maximizeutilization of all fabric connectivity.Strategies for Data Protection 21