An unidentified device or an occurs when the storage management software cannot access a device. In many instances, an unidentified device message appears when the storage management software is attempting to add a new . Causes for this error include network connection problems, the device is turned off, or the device does not exist.
If a storage system is managed by using both and on the same host, a network connection problem on the might prevent direct communication with the storage system over the network. However, you might still be able to manage the storage system over the in-band connections. The opposite situation can also occur.
If a storage system is managed through more than one , it is possible that the storage system might become unresponsive to communication over the connections given by one host. However, you might still be able to manage the storage system over the connections provided by another host.
Note: Before you perform any recovery procedure to access the device, make sure that the host-agent software is installed and running. If you started the host before the host was connected to the storage system, the host-agent software will not be able to find the storage system. If so, make sure that the hardware connections are secure, and restart the host-agent software.