HP StorageWorks SAN Virtualization Services Platform administrator guide (5697-0204, January 2010)

Figure 16 Zoning between VSMs and first quad of a DPM pair
.
VSM-storage zoning
A VSM-Storage back-end zone is used to give the VSM access to the ports of the back-end storage
device to manage the storage being virtualized by SVSP, and facilitate data mover functions involving
the “slow path” such as mirroring, local snapshots, and remote replication. A back-end path between
the VSM and the storage device consists of a single port on the VSM and a storage device port. In
this type of zone, the VSM acts in the initiator role. The only rule for creating VSM-Storage zones is
that each VSM initiator port is zoned to all storage device ports on the give fabric. Unlike the DPM-Host
or DPM-Storage zoning, there is no limitation on the number of paths that exist between the VSM and
storage device. However, there is a limitation on the number of back-end LUNs that can be presented
to the VSMs. See the product release notes for the maximum number of back-end LUNs supported by
HP SVSP. Each zone has a single VSM back-end initiator port and multiple storage device target
ports.
Figure 17 illustrates zoning between VSMs and a dual, dual-port controller back-end storage device.
This can be extended for storage devices with more ports by adding them to the existing zones. Paths
between the storage device target ports and VSM initiator ports are color coordinated to represent
the different zones to which they belong within the red and blue fabrics.
Figure 17 Zoning between VSMs and two dual-port back-end controllers
.
Zoning54