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

Figure 7 Dual-fabric port configuration for 4–port and 8–port dual-controller back-end storage devices
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Figure 8 DPM dual-fabric port configuration
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Notice how each DPM quad has a target and initiator on both the red and blue fabrics.
Figure 9 Single VSM dual-port configuration
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Figure 10 Host server dual-port configuration
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DPM-host zoning
A DPM-Host front-end zone is used to give a host access to the virtual disks created in HP SVSP and
presented through the DPM front-end target ports. A front-end path between the DPM and the host
consists of a single host port and a single DPM front-end port. The following rules must be applied
when creating DPM-Host zones:
• Each host port on a single host is zoned to exactly one front-end target port from each DPM.
Zoning to a port from each DPM allows for failover capabilities if the active DPM fails or the
particular active front-end port fails.
• Each host port on a single host is zoned to a different port on a given DPM. Zoning multiple ports
on a host to a single DPM front-end port leaves the configuration vulnerable to a loss of availability
if the DPM port fails.
Using the rules described, each zoned host port has exactly two front-end paths to a presented virtual
disk with one front-end path through each DPM. (This is one exception to the guideline in “HP SVSP
zoning principles” on page 46, where it states that each zone contains only two physical devices
where a target device can be represented by multiple ports but an initiator device can be represented
by only a sing port. The DPM front-end ports used in this zone are strictly target ports in HP SVSP and
have no interaction with each other.)
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