Chapter 3: Host Connection 55
Four Hosts to a
Controller Tray or a
Controller-Drive
Tray
The following figure shows an example of a switch topology with four hosts, a
controller tray or a controller-drive tray, and two zoned switches. The following table
describes which of the components in this topology are non-redundant and present a
risk of a single point of failure.
ATTENTION Possible loss of data access – You must install alternate path software
or an alternate path (failover) driver on the host to support failover in the event of an
HBA failure or a host channel failure.
Table 11 Redundant and Non-Redundant Components in a Switched
Configuration with Four Hosts and a Controller Tray or a Controller-Drive Tray
Component Redundant Non-Redundant
Host/server (see note) Redundant
Host adapter Redundant
Host-to-controller cable Redundant
Switch Redundant
Controller Redundant
Note – The hosts/servers in this example must be clustered to be redundant.
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