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

Figure 14 Zoning between 2 dual-port controllers and first quad of each DPM
Figure 15 (page 39) illustrates full zoning between a dual, quad-port controller back-end storage
device and the first two quads of each DPM.
Figure 15 Zoning between 2 quad-port controllers and two quads of each DPM
If greater control over the available paths to each LUN is required (for example, to improve load
balancing), use a combination of more restrictive zoning and LUN presentation to the DPM from
the back-end storage device.
Unlike the DPM-Host zoning where the front-end paths created to a DPM are considered similar
to one another, the paths in the DPM-Storage zoning are very different from one another. Depending
on the type of back-end storage device and its firmware, there are generally two types of back-end
path relationships: active/passive paths or active optimized/non-optimized paths. With
active/passive back-end paths, the LUN can only be accessed through the active paths. This
behavior is similar to the active/passive relationship between DPMs and hosts in an HP SVSP
domain. Active optimized/non-optimized paths allow for the LUN to be accessed through either
type of path. As the name suggests, accessing a LUN using the non-optimized path can lead to
less than the peak performance expected from the storage device. This is true in the case of the
HP EVA where using the active non-optimized paths for reads to a LUN results in internal proxy
I/Os between storage controllers and should be avoided.
DPM-storage zoning 39