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"Thank you. I know that I can turn off all enclosures and then cable them cold. But the MD3220i is advertised with a hot plug enclosure functionality "...hot plug additional storage enclosures without shutting down the system". I am looking for the documentation that explains how to do this in a supported way."
"Just returned from something along these lines.We have a Dell MD3200 with 2x RCM's connected redundantly via direct SAS to two R710's using Dell 6 Gbps SAS HBA's. The MD3200 has an MD1200 enclosure connected as well.We just purchased an additional MD1220 -- brand new from Dell.Racked the MD1220. Powered it up. Blue light on the front. No HDD lights lit and will not light until connected to an RCM or a host adapter.Connected via the cascade style cabling diagram the MD1220 to the MD1200, which is connected to the MD3200. We decided to connect just one EMM first.The SAS ports on the MD1220 and MD1200 EMM's lit up.Watching MDSM as we cascade connected one EMM on the MD1220 to the EMM on the MD1200. On the Summary Tab, the "Enclosures:" ticked up from 2 to 3. Within a few seconds after that the "Physical Disks:" starting increasing as the drives were recognized. Within 10 - 15 seconds all disks were recognized. MDSM then detected a Path Redundancy issue. We plugged in the second EMM, clicked on the error message, clicked on the button to "Recheck" a few times and within another 15 seconds the Path Redundancy issue was gone and the array status was back to optimal.Running FW version 07.75.14.61 on the MD3200.-Weaver"