44
Direct-Attach
Topologies
The host-to-controller tray topologies presented in this section do not use switches.
The host adapters might be HBAs for Fibre Channel or SAS, HCAs for InfiniBand, or
Ethernet for iSCSI. Some controller trays and controller-drive trays support more
direct host connections than the examples shown. To connect more host connections,
follow the pattern established by the examples in this section.
When a host is connected to a dual-controller controller-drive tray or a dual-controller
controller tray, each attached host should have two host adapters installed. For
redundancy, connect one host adapter to controller A and the other to controller B.
One Host to a
Controller Tray or a
Controller-Drive
Tray
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 tray or a
dual-controller controller-drive tray.
The example in the figure identifies 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.
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