Modifying a Global Mirror session

Complete this task to modify an existing Global Mirror session by modifying the session properties.

Note:

You must pause the Global Mirror session before making any modifications.
If you are using DS CLI, query the Global Mirror processing status after you pause the processing.

Global Mirror supports data consistency across multiple volumes, multiple LSSs, and multiple storage units using sessions. A session is a collection of volumes that are managed together during the creation of consistent copies of data. Use the following rules to create sessions:

An LSS can only be assigned to one session.
A Global Mirror master storage unit coordinates the consistency group that is identified by a single session ID.
You are responsible for correctly defining sessions and managing the volumes within that session.
A maximum of eight storage units are allowed per session.

Perform the following steps to modify the properties of a Global Mirror session:

In the navigation, select Real-time Manager > Copy Services > Global Mirror. A page containing a list of sessions displays. Select one or more sessions on which to perform an action.
On the Global Mirror — Main page, select Modify from the Select Action drop-down list. Then click Go. The Modify Global Mirror — Select volumes page is displayed.
From the Modify Global Mirror — Select volumes page, accept or modify the selected storage complex from the Select storage complex drop-down list.
Accept or modify the selected volumes from the Select volumes navigation. The volumes that you selected appear in the Selected volumes list.
1. Optionally, you can click the Create FlashCopy button to create a new FlashCopy relationship. After you create the FlashCopy relationship and the table resets, the new valid volumes are available for selection.
2. Optionally, you can click the Create Metro Mirror button to create a new Metro Mirror relationship. After you create the Metro Mirror relationship and the table resets, the new valid volumes are available for selection.
When you have finished selecting your volumes, click Next. The Modify Global Mirror — Define Global Mirror properties page is displayed.
Accept or modify the session number in the Enter session number field.
Note: The session number consists of two hexadecimal characters ranging from 01 - FF (1-255 in decimal). This number is unique across the enterprise and uniquely identifies the session.
Accept or modify the storage complex for the master LSS in the Select storage complex for master LSS field.
Optionally, specify the master LSS in Select master LSS.
Note: The master LSSs that are available for selection depend on what you specified for Select storage complex for master LSS.
Optionally, specify the consistency group interval time in Consistency group interval time. This value indicates how long (in seconds) you must wait between the formation of consistency groups. If the value is set to zero, the consistency group is formed continuously. The default value is 0. The maximum value is 65 535 seconds.
Optionally, specify the maximum coordination interval in Maximum coordination interval. This value indicates the maximum time (in milliseconds) that XDC pauses the primary host I/O to form a consistency group. The default value is 50. The maximum value is 65 535 milliseconds.
Optionally, specify the maximum time writes are inhibited to the remote site before stopping the current consistency group in Maximum time writes inhibited to remote site. This value indicates the maximum amount of time (in seconds) that writes are inhibited to the remote site before stopping the current consistency group. The default value is 30.
Click Next. The Modify Global Mirror — Select subordinates page is displayed.
Accept or modify the selected subordinates. The subordinates that you selected appear in the Selected subordinates list.
Note: In a single session, you can only select one subordinate per storage unit that is not the master storage unit. Subordinate storage units and LSSs are limited to those storage units that have paths from the master LSS.
Optionally, you can click the Create path button to create a new path. After you create the Metro Mirror relationship and the table resets, the new valid subordinates are available for selection.
Click Next. The Modify Global Mirror — Verification page is displayed.
In Modify Global Mirror — Verification, review the attributes and values to verify that they are correct.
If the attributes and values are not correct, click Back as appropriate to return to the page where you want to make changes and then specify the correct values. Otherwise, click Finish.