Dell PowerVault MD3820f - Manual (Page 239)

• Source virtual disk and snapshot virtual disk (for example, if the snapshot virtual disk has been
removed).
• Standard virtual disk and virtual disk copy (for example, if the virtual disk copy has been removed).
Unidentified Devices
An unidentified node or device occurs when the MD Storage Manager cannot access a new storage array.
Causes for this error include network connection problems, the storage array is turned off, or the storage
array does not exist.
NOTE: Before beginning any recovery procedure, make sure that the Host Context Agent software
is installed and running. If you started the host before the host was connected to the storage array,
the Host Context Agent software is not able to find the storage array. If so, make sure that the
connections are tight, and restart the Host Context Agent software.
• If a storage array is managed by using both out-of-band management and in-band management
using the same host, a management network connection problem may prevent direct
communication with the storage array. However, you may still be able to manage the storage array
over the in-band connections. The opposite situation can also occur.
• If a storage array is managed through more than one host, it is possible that the storage array may
become unresponsive to communication over the connections given by one host. However, you may
still be able to manage the storage array over the connections provided by another host.
Recovering From An Unidentified Storage Array
To recover from an unidentified storage array:
1. Make sure that the network connection to the storage management station is functional.
2. Make sure that the controllers are installed and that the power to the storage array is turned on.
Correct any existing problems before continuing.
3. If you have an in-band storage array, use the following procedure. Click Refresh after each step to
check the results:
a) Make sure that the Host Context Agent software is installed and running. If you started the host
before the host was connected to the controllers in the storage array, the Host Context Agent
software is not able to find the controllers. If so, make sure that the connections are tight, and
restart the Host Context Agent software.
b) Make sure that the network can access the host by using the ping command in the following
syntax: ping <host-name-or-IP-address-of-the-host>
If the network can access the host, continue to step c. If the network cannot access the host, skip
to step d.
c) Remove the host with the unresponsive status from the MD Storage Manager, and add that host
again.
If the host returns to optimal status, you have completed this procedure.
d) Make sure that the power to the host is turned on and that the host is operational.
e) If applicable, make sure that the host bus adapters have been installed in the host.
f) Examine all external cables and switches or hubs to make sure that you cannot see any damage
and that they are tightly connected.
g) If you have recently replaced or added the controller, restart the Host Context Agent software so
that the new controller is found.
If a problem exists, make the appropriate modifications to the host.
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