Changing the port setting of an external storage system

You can change the port setting of an external storage system from the Edit External WWNs window. However, it is important to note the following:

• If the current setting is error-free, it is best to continue using it.

• For an external volume with normal I/O, set I/O Timeout from 5 - 15 seconds.

• Use the external system’s recommended values for other port settings.

Prerequisites

You must have Storage Administrator (Provisioning) role to perform this task.

Procedure

1. Open the External Storage window.

In the Hitachi Command Suite:

1. On the Resources tab, click Storage Systems, and then expand All Storage Systems.

2. Expand the target storage systems, right-click External Storage, and then select System GUI.

In Device Manager - Storage Navigator:

1. Click Storage Systems, and then expand the Storage Systems tree.

2. Click External Storage.

2. Click the External Paths tab.

3. On the External Paths tab, select Edit External WWNs.

4. In the Edit External WWNs window, change the desired settings.

 The current values for the external WWN display unless you have selected multiple paths with different values. Then the fields are blank.

• QDepth. Enter the number of Read/Write commands that can be issued (queued) to the external volume at one time. The number can range from 2 to 128.

• I/O Timeout. Enter the number of seconds that should pass before I/O to the external volume times out. The range is 5 to 240 (seconds).

• Path Blockade Watch. Enter a time that should elapse from the time when the connection to the external volume goes down to the time when the external volume is blocked. Commands from the host are accepted until Path Blockade Watch passes, then the status of the external volume and all paths to that volume becomes Blockade. The range is from 5 to 180 (seconds).

5. Click Finish.

6. In the Confirm window, check settings, accept or enter a new task name, and then click Apply.

© 2015 Hitachi, Ltd. All rights reserved.