Different model storage systems support some different HA configurations. This includes the physical configuration of the HA pair and the manner in which the system recognizes that it is in an HA pair.
Note: The physical configuration of the HA pair does not affect the cluster cabling of the nodes in the HA pair.
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Single-chassis and dual-chassis HA pairs
Depending on the model of the storage system, an HA pair can consist of two controllers in a single chassis, or two controllers in two separate chassis. Some models can be configured either way, while other models can be configured only as a single-chassis HA pair or dual-chassis HA pair.
HA configuration and the HA state PROM value Some controller modules and chassis automatically record in a PROM whether they are in an HA pair or stand-alone. This record is the HA state and must be the same on all components within the stand-alone system or HA pair. The HA state can be manually configured if necessary.