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Technical white paper | HP Enterprise Virtual Array Storage and VMware vSphere 4.x and 5.x configuration best practices

Figure C-2. I/O routes

In this example, even though the EVA array has a total of eight controller ports (four on each controller), all I/O seems to be

routed through just two ports on Controller 1. Note that SAN zoning is only allowing each HBA to see ports 1 and 2 of each

controller, explaining why no I/O is seen on ports 3 and 4 even though round robin I/O path policy is being used.

The system is unbalanced because, despite having three Vdisks preferred to Controller 2, most of the workload is handled

by Controller 1.

You can verify this imbalance by reviewing the appropriate Vdisk path information. Figure C-3 provides path information for

Vdisk9; Figure C-4 provides information for Vdisk5.

Figure C-3. Path information for Vdisk9

Figure C-4. Path information for Vdisk5

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VMware vSphere 4 Guida Utente Pagina 58