Creating a new Global Mirror session

Complete this task to create a new Global Mirror session.

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.
The administrator is 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 create a new Global Mirror session:

In the navigation, select Real-time Manager > Copy Services > Global Mirror.
On the Global Mirror — Main Page, the following selection are required before selecting any volumes:
1. Select a storage complex from the Storage complex drop-down list.
2. Select a storage unit from the Storage unit drop-down list.
Select Create from the Select Action drop-down list. Then click Go. If an existing Global Mirror session does not exist, there are no check boxes to select and the pull-down list only allows for session creation. The Create new Global Mirror session — Select volumes page is displayed.
Select the volumes that you want to add to the session 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 Create Global Mirror — Define properties page is displayed.
In Create Global Mirror — Define properties, specify 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 Global Mirror session.
Specify the storage complex for the master LSS in the Select master LSS field.
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 65535 seconds.
Optionally, specify the maximum coordination interval in Maximum coordination interval. This value indicates the maximum time (in milliseconds) that the primary host I/O is paused to form a consistency group. The default value is 50. The maximum value is 65535 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 seconds.
Click Next. The Create Global Mirror — Verification page is displayed.
In Create 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 to complete the Global Mirror session creation process.