VMware vSphere 4 Guide de l'utilisateur télécharger pdf (Page 11)

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

The resulting topology should be similar to that presented in Figure 3, which shows a vSphere 4.x server attached to an

EVA4400 array through a redundant fabric.

Figure 3. Highly-available EVA/vSphere 4.x SAN topology

The benefits of this topology include the following:

• The topology provides increased fault tolerance, with protection against the failure of an HBA, a single fabric, or a

controller port or controller.

• As described earlier, it is a best practice to access the Vdisk through the managing (optimal) controller for read I/O. Thus,

in the event of an HBA failure, failover occurs at the HBA-level, allowing the Vdisk to remain on the same controller.

For this reason, HP highly recommends configuring each HBA port in the ESX server to access one or more ports on each

controller.

• Similarly, a controller failure only triggers a controller failover and does not cause an HBA failover, reducing system

recovery time in the event of a failure.

• A fabric failure does not trigger a controller failover or force the use of the proxy path.

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VMware vSphere 4 Guide de l'utilisateur Page 11