HP StorageWorks Enterprise Virtual Array Cluster FIO Starter Kit Podręcznik Użytkownika Pobierz pdf (Strona 41)

Figure 12 Zoning between 2 dual-port controllers and first quad of each DPM

Figure 13 illustrates full zoning between a dual, quad-port controller back-end storage device and

the first two quads of each DPM.

Figure 13 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

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HP StorageWorks Enterprise Virtual Array Cluster FIO Starter Kit Podręcznik Użytkownika Strona 41