Dell PowerVault MD3000i - Manual (Page 106)

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Troubleshooting
d Make sure that the applicable network configuration tasks have been
done (for example, the IP addresses have been assigned to each
controller).
5 Make sure that the controller firmware is compatible with the MD Storage
Manager on your management station. If the controller firmware was
upgraded, the MD Storage Manager might not have access to the storage
array. A new version of MD Storage Manager might be needed to manage
the storage array with the new version of the controller firmware.
If this problem exists, see the Dell support website at support.dell.com.
6 Look to see if there is too much network traffic to one or more controllers.
This problem corrects itself because the MD Storage Manager tries to re-
establish communication with the controllers in the storage array at
regular times. If the storage array was unresponsive and a subsequent try to
connect to the storage array succeeds, the storage array becomes
responsive.
7 For an out-of-band storage array, look to see if management operations are
taking place on the storage array from other storage management stations.
The type of management operations being done and the number of
management sessions taking place together establish the number of
TCP/IP connections made to a controller. When the maximum number of
TCP/IP connections have been made, the controller stops responding.
This problem corrects itself because after some TCP/IP connections
complete, the controller then becomes responsive to other connection
tries.
8 If the storage array is still unresponsive, problems might exist with the
controllers.
If these problems exist, see the Dell support website at support.dell.com.