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11 Configuration best practices
SAN topology
The SAN configuration for the EVA Cluster contains four fabrics while the standard SVSP configuration
contains only two fabrics. This allows the EVA Cluster to be directly plugged into the customer SAN,
and enables the back-end components to be preconfigured in the factory. This simplification will
enable many debugging, troubleshooting, and performance features in the future. One side effect of
this simplification is that the popular stretch domain configuration, additional DPM groups, and partial
virtualization of EVAs cannot be supported with this configuration. It is possible to reconfigure an
EVA Cluster into a highly formed SVSP configuration, but it is a fair amount of work.
The EVA Cluster must be installed into SANs that are reliable and have sufficient amounts of available
Fibre Channel (FC) network capacity and bandwidth to support the added requirements. For example,
the Data Path Modules should be considered high bandwidth devices and therefore need to be
attached to core or director class FC switches. In addition, any path from a server, through the DPMs,
to the back-end storage, must be free of congestion and not over subscribed. The following sections
mention some best practices for good SAN design that avoids creating congestion.
Redundant fabrics from the servers to the EVA Cluster
The EVA Cluster must be deployed into SANs that consist of dual-redundant fabrics as defined in the
HP SAN Design Reference Guide (http://www.hp.com/go/sandesignguide). Using any logical
separation in a single SAN fabric will not deliver the isolation and availability necessary in a production
environment. HP recommends that the two fabrics be constructed so they are easy to understand and
troubleshoot. For example, the cable and port assignment scheme could be designed to use mirror
image or point symmetry.
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