D3000 Disk Enclosure User Guide (734753-001, March 2014)

Dual domain example
This example illustrates cabling for a dual-domain configuration in a pattern that offers best possible
fault tolerance. In this configuration, note the following:
• A multi-port, dual-domain controller in the host and dual-port disk drives in the disk enclosure
are required for dual-domain deployments.
• Cables from each I/O module in the disk enclosure to the server or controller enclosure and
to additional cascaded disk enclosures provide dual-domain connectivity.
• The reversing of the cable paths ensures access to the storage, even if the controller, cable,
enclosure I/O module, or enclosure power supply fails.
• This example illustrates using a disk enclosure with one additional cascaded disk enclosure.
More than one additional disk enclosure can be cascaded. For more information, see the
QuickSpecs for the enclosure.
Dual domain example 43