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Storage HA:
The storage volumes are stored in RAID 6 redundant aggregates i.e. they can deal with 2 disk failures and still function with reduced performance. These volumes are served to the clients by a host called a head. There are two heads primary and secondary. The disks are served to the client by the primary but in case of primary head failure, the secondary head takes over the role of the primary for the disk and starts serving the data. This failover is done in few seconds and is more or less transparent to the client. The storage heads are connected to the redundant storage subnet via redundant bonded ethernet cards i.e. the network connection between the storage heads and the storage subnet does not have a single point of failure.
Storage subnet:
Storage subnet is a completely redundant switched network i.e. there is no single point of failure in the storage subnet.