Chapter 3: Host Connection 53
Two Hosts to a
Controller-Drive
Tray with Switched
SAS Connections
The following figure shows an example of a switch topology with two hosts, a
controller-drive tray, and two SAS 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 10 Redundant and Non-Redundant Components in a Switched
Configuration with two Hosts and a E2600 Controller-Drive Tray or a E2660
Controller-Drive Tray
Component Redundant Non-Redundant
Hosts/servers (see note) Redundant
Host adapters Redundant
Host-to-switch cables Redundant
Switches Redundant
Controllers Redundant
Note – The hosts/servers in this example must be clustered to be redundant.
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