Dual domain example — best fault tolerance cabling
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.
1. Host (server or controller enclosure)
2. Primary disk enclosure
3. Additional cascaded disk enclosure
4. Primary path
5. Additional path
46 Cabling examples
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