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Redundancy is established by installing separate data paths between the host

and the storage array, in which each path is to one of the two RAID controller

modules installed in the storage array. Redundancy protects the host from

losing access to data in the event of path failure, because both RAID

controller modules can access all the disks in the storage array.

Single Controller Configurations

Figure 2-1 through Figure 2-3 show two and four hosts, each connected to

only one RAID controller module. The hosts can share storage space but

without redundant paths, if one path were to fail, the server on that path

would be disconnected from the storage array.

Figure 2-1. Two Hosts Connected to a Single Controller

Storage array

Server 1

Server 2

Corporate, public,

or private network

Hardware Installation