Chapter 3: Host Connection 47
One Hosts with
Direct SAS
Connections to Four
Controller-Drive
Trays
The following table lists the components in this topology that are non-redundant and
present a risk of a single point of failure. The following figure shows an example of a
direct-attach topology with one host and a dual-controller controller-drive tray.
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 a
SAS HBA failure or a host channel failure.
Table 6 Redundant and Non-Redundant Components in a Direct-Attached
Configuration with One Host and Four Controller-Drive Trays
Component Redundant Non-Redundant
Host/server (see note) Non-Redundant
HIC (SAS) Redundant
Host-to-controller cables Redundant
Controllers Redundant
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