Creating a Metro Global Mirror session and adding copy sets

A Metro Global Mirror session is a method of continuous, remote data replication that operates between three sites of varying distances apart. Metro Global Mirror combines Metro Mirror synchronous copy and Global Mirror asynchronous copy into a single session, where the Metro Mirror target is the Global Mirror source.

1. Follow these steps to create a Metro Global Mirror session:
   1. In the menu bar, click Sessions.
   2. On the Sessions page, click Create Session.
   3. In the Create Session window, select the following options:

      Hardware type

      Select the hardware type DS8000®.

      Session type

      Select a Metro Global Mirror session type.

      Session name

      Enter a name to identify the session. The session name can be up to 250 alphanumeric characters. The default name for a new session is newsession.

      Site x Location

      For each site that is in the session, select the location for the site or None. The site location, if available, is set by storage system on the Storage Systems page.

      You can associate a location with each storage system and each site in a session. This site awareness ensures that you can select only storage systems that have either a matching site location for each role or have no defined location when you add copy sets to a session.

      Session image

      Shows an image that represents the session. The session image is displayed when you select a session type. The image is a visual aid to help you create your session.

      This image shows the number of roles in the session and how the roles are distributed between the sites. The arrows indicate the type of copy between roles:

      • Straight arrows = synchronous replication
      • Straight arrows with an asynchronous replication symbol = asynchronous replication
      • Lightning bolts = FlashCopy® replication

      If you selected a location for the sites that are in the session, the sites are labeled with the site location. If you did not select site locations, the sites are labeled with Site x, where x is the site number. You can hover the mouse pointer over the site location to view the text in a larger format.

   4. Click OK.
   5. If the session was successfully created, click Launch Add Copy Sets Wizard and continue to the next step.
      If the session was not created, refer to the displayed message text to fix the problem.
2. Follow these steps to add copy sets to the session:
   1. In the Add Copy Sets wizard, enter the following information for the choose volume pages. The field names that are displayed depend on the storage system type. When you complete the information on each page, click Next.

      Storage system

      Select a storage system. If the volume role has a site location that is assigned to it, you can select a storage system that is assigned to the same location as the role or a storage system that is not assigned to a location. Storage systems that have a location are listed under the location. Storage systems that do not have a location are listed under None. If the role does not have a site location, you can select any storage system.

      Logical storage system

      Select a logical subsystem (LSS).

      Volume

      Select one volume or all volumes. The volumes are limited to the volumes within the LSS, I/O group, or pool that you selected.

      The use of extent space-efficient volumes in volume roles is dependent on the capabilities of the storage system.

      Session image

      Shows an image that represents the session in which the role for which you are selecting volumes is highlighted. This image shows how many roles are in the session and how the roles are distributed between the sites.

      Volume Details

      Shows information about the selected volume, including the volume name, full name, type, capacity, and whether the volume is protected and space-efficient.

      Use a CSV file to import copy sets

      Select this option to import copy sets from a comma-separated value (CSV) file. Click Browse to select the CSV file.

   2. On the Select Copy Sets page, select from the following options and click Next:

      Select All

      Click this button to select all of the copy sets in the table.

      Deselect All

      Click this button to clear all of the copy sets in the table.

      Add More

      Click this button to add another copy set to the list of copy sets to be created.

      When you click Add More, you are returned to the Choose Host1 page of the wizard. On this page, the Storage system and Logical storage system, I/O Group, or Pool lists are populated with the values from the previously selected copy set. Repeat the previous steps to complete the choose volume pages and add additional copy sets.

      Selection check boxes

      Select one or more copy sets that you want to create.

      Host 1

      Lists the volume IDs that are associated with the Host1 role. You can click the link to display information about the volume, including the full name, type, capacity, and whether the volume is protected and space efficient.

      Copy Set

      Displays the copy set information for the specified copy sets and any warning or error messages that are associated with the copy set.

      A warning or icon next to the Show button indicates that you cannot create a copy set for the H1 volume. Click Show to view the message.

   3. On the Confirm page, the number of copy sets to be added is displayed. Click Next.
   4. A progress bar is displayed. When the copy sets are added, review the results and click Finish.
3. Follow these steps to add properties for the session:
   1. On the Sessions page, select the session.
   2. From the Session Actions list, select View/Modify > Properties.
   3. In the View/Modify Properties notebook, select the options that you want. For a description of the options, see Viewing session properties.
   4. Click OK.