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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, enclos-
ure I/O module, or enclosure power supply fails.
• This example illustrates using a Small Form Factor disk enclosure with one additional cascaded
disk enclosure. When using Large Form Factor disk enclosures, more than one additional disk
enclosure can be cascaded. For more information, see the QuickSpecs for the Large Form Factor
disk enclosure.
1. Host (server or controller
enclosure)
2. Primary disk enclosure
3. Additional cascaded disk
enclosure
4. Primary path
5. Additional path
Cabling examples48