After you select External Storage from the Storage Systems tree in Device Manager - Storage Navigator, 'Warning' is displayed in the Status field of the External Storage window when there is an abnormal mapping path in the external volume group of the corresponding external storage. You can check details about the abnormal mapping path in the View External LUN Properties window.
The following table shows path statuses in the View External LUN Properties window. Descriptions and corrective actions you can take are provided.
Also, see Troubleshooting path errors for specific storage systems. If you cannot resolve the issue, contact customer support.
| Status | Description | Corrective action |
|---|---|---|
| Unknown | The path status cannot be determined. | Contact customer support. |
| Blockade | The external port is blocked. | The port is blocked because of firmware replacement, package replacement, or another factor. Check the status of the local storage system. |
| External device setting changed | An external system setting has changed. For example, the path definition was deleted, or the external system itself was replaced by another device. | The port of the external system is recognized. See your device manufacturer's documentation to verify that the settings on the volumes in question have not changed. |
| LDEV size reduced | The external volume capacity was reduced. | Check the external volume capacity. If the LDEV is smaller than expected, delete the external volume, and then remap to it. |
| Not ready | The reply of the external system was NOTREADY. Either the drive is spinning up or the system is being formatted. | The path cannot be used to access the external system. Check the status of the external system. |
| Illegal request | The reply of the external system was ILLEGALREQUEST. The command cannot be run on the external system. Data protection might be set on the external system. | The external system port is recognized. Check the external system settings and correct any problems. |
| Command aborted | The reply of the external system was ABORTEDCOMMAND. An error might have occurred on the external system side. | The external system port is recognized. Check external system settings and the physical connection to the external system (cables and switches) and correct any problems. |
| Busy | The external system is in the BUSY status. | The external system port is recognized. Check whether the external system configuration causes excessive load on the system. If the load is excessive, lower the load. |
| Response error | The external system is in blocked status caused by an abnormal reply (Response). You might not be able to access the system, or data protection might be set. | The external system port is recognized. Check the settings and status of the external system and fix any problems. |
| Initiator port | The port attribute of the external system has been changed to "initiator". | Set the port attribute of the external system to "target". |
| Destage Failed | The writing of data from cache memory to the external volume failed. | Reconnect the external volume or system. When status is Normal, disconnect the volume or system. You might need to try this multiple times. |
| Unknown port | The port attribute of the external system is unknown. | The external system port is recognized. Check external system settings and
the physical connection to the external system (cables and
switches), and fix any problems. When alternate paths are configured for the external system, the following conditions might cause the unknown port status. If that is the case, verify the path configuration and add the required paths, if any.
|
| Cannot detect port | The external path has been removed or the external system port cannot be
found. Possible causes are:
|
If you cannot restore the path after checking the possible causes, contact customer support. |
| Internal error | A program error occurred, or there is a logical contradiction. | Contact customer support. |
| Timeout | Processing was retried after an abnormal reply. However, processing stopped because of a timeout. | The external system port is recognized. Check external system settings and the physical connection to the external system (cables and switches). |
| Device check error | An external volume is mapped, but you cannot access the volume in the external system. | Check the status of the volume in the external system and take any
necessary corrective action. Format the volume if it is not formatted. |
| Medium error | The external volume has become inaccessible. | Check the status of the volume in the external system and take any
necessary corrective action. Format the volume if it is not formatted. |