Hitachi Device Manager - Storage Navigator cannot access an external volume.

• An error occurred in the switch, or the switch is off.
• A cable between the local and external system is not connected properly.
• The external volume was deleted in the external system.
• An error occurred in the external volume.
• The path is changed in the external system.
• The port attribute in the local storage system is changed.
• Topology information is not properly set.

An external volume cannot be mapped.

• The number of mapped volumes exceeds the maximum number available for the local storage system:

  - VSP G100, G200: 2,048

  - VSP G400, G600, VSP F400, F600: 4,096

  - VSP G800, VSP F800: 14,080

• There are not enough LDKC:CU:LDEV numbers available for external volume mapping.

An external path is blocked.

1. See the preceding problem, "Device Manager - Storage Navigator cannot access the external volume". If the problem persists after correcting any errors, continue to step 2.
2. Confirm that the cables between the local and external systems are connected properly.
3. If the cables are properly connected, disconnect and then reconnect them. After 30 seconds, check the path status.

Action is required for a path status in the View External LUN Properties dialog box.

See Troubleshooting external path status .

The volume in the external system cannot be found even after port discovery or volume discovery was performed.

Follow any instructions given in the error message or messages and then retry the operation. If the problem persists, see Troubleshooting port and volume discovery problems .

The external volume is blocked.

• All external paths are blocked (paths are not connected).
• The external volume is not set to Read/ Write.
• The external volume is blocked by an error.

The status of the external volume is Blockade.

When errors occur in all external paths, the local storage system changes the status of the external volume to Blockade.

• Reconnect the volume or storage system.
• If the volume's status still does not change to Normal, restore the path as described in the preceding problem, "The external path is blocked", and then reconnect the volume again.

The ? sign displays in the LUN ID (Highest Priority) column of the Discovered External Volumes table in the Add External Volumes window.

A corresponding external volume was not found for the external path with the highest priority.

Look for problems with the connection to the external system that failed during volume discovery. Fix any problems, and perform the operation again.

External volume discovery was not completed because of failure.

Look for problems with the connection to the external system; also verify that the external volume is correctly configured in the external system. Fix any problems, and then perform the operation again.

After reconnecting an external volume or system, 10 minutes have passed but the status has not change from Checking.

Click Refresh on the Device Manager - Storage Navigator main window. If the status remains Checking, perform the reconnect operation again.

After disconnecting an external volume or system, the status does not change.

Click Refresh on the Device Manager - Storage Navigator main window.

Note that the time required for write processing from cache to the external volume depends on volume capacity. More time is required for larger volumes. Processing speed is about 20 MB/s. However, the processing speed also depends on the performance and status of the external storage system.