HP StorageWorks SAN Virtualization Services Platform Administrator Guide (5697-0934, May 2011)

Figure 13 Zoning between two servers with two HBAs and two quads of a DPM pair
DPM-storage zoning
A DPM-Storage back-end zone is used to give the DPM access to the back-end storage used to
create virtual disks managed by HP SVSP. A back-end path between the DPM and back-end storage
consists of a single DPM back-end initiator port and a single port on a back-end storage device
controller. The following rules must be applied when creating DPM-Storage zones:
• Each DPM back-end initiator port is zoned to exactly one port from each controller on a
back-end storage device. This allows for back-end failover capabilities if a storage device
port or the controller fails.
• Each DPM back-end initiator port is zoned to a different port on a given back-end storage
device controller. Zoning multiple DPM ports to a single storage device port leaves the
configuration vulnerable to a loss of availability if the storage port fails.
• Each storage device port is zoned to exactly one back-end initiator port from each DPM.
Zoning to a port from each DPM allows for back-end failover capabilities if the active DPM
fails or the particular active back-end port fails.
• Each zone has a maximum of four storage device ports. (This rule is necessary when zoning
larger arrays with more storage device ports and controllers such as the XP array.)
Using these rules, each zoned DPM back-end initiator port has exactly one back-end path to each
controller in a storage device. In the case of the HP EVA being the storage device, the dual-controller
configuration translates into two paths to the EVA through each DPM back-end initiator port. The
number of overall back-end paths is dependent on the number of ports on the storage device. For
example, an HP EVA4400 has two ports on each controller, which would equal four back-end
paths through each DPM, while the HP EVA8100 has four ports on each controller that would
equal eight paths through each DPM.
Figure 14 (page 39) illustrates full zoning between a dual, dual-port controller back-end storage
device and the first quad of each DPM. Paths between DPM initiator ports and storage device
target ports are color coordinated to represent the different zones to which they belong within the
red and blue fabrics.
38 Zoning