6.2.2 Access Path Display (Display of Logical Relationship Between Server Node and Storage Systems)

This software gathers information from each device and displays the status of access paths or the status of logical access paths from the server node. This function is effective for verifying the validity of system configuration setup and recognizing the effect of a resource error because it enables the logical relationship in the more complicated SAN environment to be easily determined.

If the server node operates under a Solaris environment and the storage system is a library or tape device, the tape-type drivers for which access paths can be displayed are as follows:

st, ftla, fsct, IBMtape, mt, lb, sg, sgen

Note

The Solaris server node uses special file /dev/rdsk/cXtX, /dev/rmt to obtain WWPN binding information. For this reason, to recognize WWPN binding, this special file (device file) must be created in advance. If any unused special file is in /dev/rdsk/, /dev/rmt, it causes the access path display to be incorrect. If access path display by this software differs from that by system equipment, clarify the special files defined in the following operations:

Solaris (For the environment which uses hard disk driver (HDDV), and does not use multipath control (ETERNUS Multipath Driver, MPLB, MPHD))
```
# touch /reconfigure
# /usr/sbin/shutdown -y -i6 -g0 (server node restart processing)
```
After the server node has been restarted
```
# format (Loading processing to HDDV driver's kernel)
# disks -C
```
Solaris (For the environment which uses both hard disk driver (HDDV) and multipath control (ETERNUS Multipath Driver, MPLB, MPHD), uses only multipath control or uses neither.)
```
# touch /reconfigure
# /usr/sbin/shutdown -y -i6 -g0 (server node restart processing)
```
After the server node has been restarted
```
# disks -C
```

You can check the access path status connected by the Fibre Channel on the Status column on the Access Path screen.
The status of access paths are displayed as the following icons. When you click the each status, the corresponding error content message is displayed.
In addition, if you check the access path status, click Refresh on the Action pane to update the access path status.

Access Path Status	Description	Action
Normal	The access path is normal.	No action is required. However, for HBA shown below, you must take actions for making the operating system recognize LUN. If the HBA is XSEFC401AF, XSEFC402AF, SG-XPCIE2FC-EM4, or SG-XPCIE2FC-EM8 In an environment connected to a Fibre Channel switch, configure the HBA N port settings. Refer to "4.1.1.2 N-port Settings", and check the N-port settings. If the settings are incorrect, correct them. Check the storage Ap_id by executing cfgadm -al command, and make the OS recognize the LUN by executing cfgadm-c configure Ap_id command. For details about the commands, check the man command. If the HBA is SE0X7F21F, SE0X7F22F, SG-XPCI1FCQF2, SG-XPCI2FC-QF2 SGXPCI1FC-QL2, SG-XPCI2FCQF2-Z, SG-XPCI1FC-QF4, or SGXPCIE2FC-QF8 Check the storage Ap_id by executing cfgadm -al command, and make the OS recognize the LUN by executing cfgadm-c configure Ap_id command. For details about the commands, check the man command.
Warning	The following possibilities are considered. The access path definition is inconsistent. The Fibre Channel switch is not registered.	When the access path definition is inconsistent Click status to display the error content message. Refer to "Error Messages of Access Path" in the Messages, take actions according to the instructions for the error message. When the Fibre Channel switch is not registered Register all the Fibre Channel switches connected in cascade. If the storage device and the server are connected directly to each other, no action is required.
Error	The following possibilities are considered. The access path is disconnected due to an error (if the multipath control mechanism is installed). Another part failure caused an access path error. This state also occurs if a device in the access path is faulty. The Fibre Channel cable on a route is disconnected. The access path is set "Offline" by the user. HBA was reduced or replaced. The Fibre Channel switch is not registered.	Click status to display the error content message. Refer to "Error Messages of Access Path" in the Messages, take actions according to the instructions for the error message. When an error might occur in the access path Reload the configuration to the device defined as an access path for identify whether a failure occurs or not. Replace the faulty part, and execute recovery processing. When the access path is set to "Offline", set it to "Online" as necessary. If HBA was reduced Delete the access path on the Access Path screen. Refer to "Delete Access Path" in the Web Console Guide for details on how to delete. If HBA was replaced It is required to take corrective action that corresponds to the HBA status displayed on the Server Detail screen. Perform the Reload Conf. operation as to the replaced HBA-installed device to perform the following steps: If the HBA status is "Changed" Perform access path modification operation. Refer to "10.3.1.2.1 Post-replaced HBA State Is "Changed"" for details on the inheritance operation. If the HBA status is "Unknown" Perform access path modification operation. Refer to "10.3.1.2.2 Post-replaced HBA State Is "Unknown"" for details on the modification operation. When the Fibre Channel switch is not registered Register all the Fibre Channel switches connected in cascade. If the storage device and the server are connected directly to each other, no action is required.
Unknown	The following possibilities are considered. The access path status needs to be updated. Access path settings are incorrect. HBA has been replaced. The access path is not created The Fibre Channel switch is not registered.	Click Refresh on the Action pane to update the access path status. When the server is not registered on the Management Server or Storage Cruiser's agent is not installed on the server (manually embedded server) "Unknown" is displayed because the access path status cannot be obtained. For displaying the access path status, install Storage Cruiser's agent and register the server on the Management Server. If HBA was replaced It is required to take corrective action that corresponds to the HBA status displayed on the Server Detail screen. Perform the Reload Conf. operation as to the replaced HBA-installed device to perform the following steps: If the HBA status is "Changed" Perform access path modification operation. Refer to "10.3.1.2.1 Post-replaced HBA State Is "Changed"" for details on the inheritance operation. If the HBA status is "Unknown" Perform access path modification operation. Refer to "10.3.1.2.2 Post-replaced HBA State Is "Unknown"" for details on the modification operation. When the access path is not created Create an access path. When the Fibre Channel switch is not registered Register all the Fibre Channel switches connected in cascade. If the access path is not created, create it. If the storage device and the server are connected directly to each other, no action is required.
(-) hyphen	Access path cannot be displayed because the interface is iSCSI.	No action is required.

Note

For devices that support automatic updates of the device component status, the status of the access path is automatically updated when the link status of a port is changed. It may take a few minutes to display the status of the access path after the link status is changed. For devices that support automatic updates of the device component status, refer to "2.5 Monitoring Device Component Status".
If the link status of the port is not changed or if the device does not support automatic updates of the device component status, the status of the access path is not updated automatically. When you check the status of the access path, click Refresh on the Action pane to update the status of the access path.
In an environment not connected to a Fibre Channel switch, the status of the access path is not displayed correctly.
It may take a few minutes to update the status of the access path. You can check the completion of the process on the Operation History screen.

6.2.2 Access Path Display (Display of Logical Relationship Between Server Node and Storage Systems)

6.2.2.1 Access Path Status Display