Intel RAID High Availability Storage User Manual page 18

Figure 10 Example of Incorrect Cabling of Two Disk Enclosures
This configuration does not work for the following reasons (the numbers correspond to the labels in the
figure):
1. The failure of an ESM in drive enclosure A causes disconnection between a server and both drive
enclosures.
2. The lack of a proper connection from a controller port number to a common enclosure ESM results in
inconsistent device reporting.
3. The failure of drive enclosure A results in disconnection of drive enclosure B from both servers.
The following figure shows how to add a second disk enclosure to an existing two-server cluster without
interrupting service on the HA configuration.
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Intel High Availability Storage User Guide
18