Storage Navigator cannot access the external volume.

• An error occurred in the switch, or the switch is off.

• The cables are not properly connected.

• 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.

The external volume cannot be mapped.

• The number of mapped volumes exceeds the maximum number (VSP G200: 2,048, VSP G400 and VSP G600: 4,096, VSP G800: 14,080) available for the local storage system.

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

The external path is blocked.

• See the problem above, “Device Manager - Storage Navigator cannot access the external volume”. If the problem persists after correcting any errors, continue to the next item.

• Confirm that the cable between the local and external system is connected properly.

• If the cable is properly connected, disconnect it and then reconnect. After 30 seconds, check the path status.

If the path is not restored, call Hitachi Data Systems customer support.

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.

Perform any required action in the message 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 problem above, “The external path is blocked”, and then reconnect the volume again.

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

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

Confirm the connection with the external system that failed during volume discovery, correct the error, and perform the operation again.

External volume discovery was not completed because of failure.

Confirm the connection with the external system; also confirm that the external volume is correctly configured in the external system, 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.

If the problem persists after a reasonable time, call Hitachi Data Systems customer support.

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

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, this also depends on the performance and status of the external system.

If status does not change from Cache Destage after a reasonable time, call Hitachi Data Systems customer support.