46
Two Hosts to a
Controller Tray or a
Controller-Drive
Tray
The following table lists the components in this topology which 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 two hosts and a dual-controller controller tray or a
dual-controller controller-drive tray.
The example in the figure shows HBA1 and HBA2 as connecting points on the host.
For other configurations, these connecting points might be host channel adapters
(HCAs) for InfiniBand connections, Ethernet adapters for iSCSI connections, or a
combination of one HBA and one iSCSI Ethernet adapter.
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, HCA, or iSCSI Ethernet adapter failure or a host channel failure.
Table 5 Redundant and Non-Redundant Components in a Direct-Attached
Configuration with Two Hosts and a Controller Tray or a Controller-Drive Tray
Figure 2 Direct-Attach Topology – Two Hosts and a Controller Tray or a
Controller-Drive Tray
Component Redundant Non-Redundant
Host/server (see note) Redundant
iSCSI Ethernet adapter,
HBA, HCA, or SAS
Redundant
Host-to-controller cable Redundant
Controller Redundant
Note – The hosts/servers in this example must be clustered to be redundant.
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