Creating GAD pairs

You must create GAD pairs on the primary storage system.

Note
  • To avoid excess traffic on your TCP/IP network, you should consider stopping Performance Monitor monitoring operations before creating multiple pairs. For details, see the Performance Guide for the storage system.
  • If you create GAD pairs when the ALUA mode is enabled, restart the server after the pair creation is complete. If you do not restart the server, the server might not be able to recognize the ALUA mode setting.

Before you begin

  • Storage Administrator (Provisioning) role is required.
  • The secondary volume must be offline from all servers.
  • You must know the port ID, host group ID or iSCSI target ID, and LUN ID of the primary and secondary volumes.
  • The logical units (LUs) at the primary and secondary sites must be defined and initialized.
  • The remote path between the primary and secondary storage systems must be installed and configured.

Procedure

  1. On the Resources tab, expand the Storage Systems tree, right-click the local storage system, and then click Remote Replication.

  2. Select the GAD Pairs tab, and click Create GAD Pairs to open the Create GAD Pairs window.

  3. Specify the remote storage system.

    • Model / Serial Number: Select the model and the serial number.
    • Path Group ID: Select the ID for the path group.

  4. In Primary Volume Selection, for Selection Object, select the port type of the local storage system.

  5. In Primary Volume Selection, from LU Selection, select the port ID and the host group name or iSCSI target alias of the local storage system.

    The volumes that can be used as primary volumes are displayed in the Available LDEVs table.

  6. In Primary Volume Selection, from the Available LDEVs table, select the primary volume.

    Specify the actual LDEV ID when specifying a volume in a virtual storage machine. Do not specify the virtual LDEV ID.

  7. In the Secondary Volume Selection, from Base Secondary Volume, specify the information related to the base secondary volume.

    • Port ID: Select the port name.
    • Host Group ID / iSCSI Target ID: Select the ID for the host group or iSCSI target.
    • LUN ID: Select the LUN ID.
    • Selection Type: Select Interval or Relative Primary Volume.

  8. Select Mirror ID.

  9. Select Quorum Disks.

  10. Select CTG ID. To register GAD pairs to a consistency group, set the same mirror ID and quorum disk for all pairs in the consistency group.

  11. Click Options if necessary.

  12. Select Initial Copy Type.

  13. In Copy Pace, specify the maximum number of tracks to be copied in a single remote I/O. The default is 15 (fast copy pace). To change the copy pace, enter a number from 1 to 4:

    • The speed of 1 is a slow copy pace, and is used to reduce impact on host I/O.
    • The speeds of 2 and 3 are a medium copy pace.
    • The speed of 4 is a fast copy pace, and the host I/O performance might be degraded.

    If you enter a number from 5 to 15, the speed of 4 (fast copy pace) is used.

  14. Select ALUA Mode.

  15. Click Add.

    The created pair is added in the Selected Pairs table. If you want to remove a pair from the Selected Pairs table, select the pair and click Remove. If you select a pair and click Change Settings, the Change Settings window appears and you can change the pair settings.

  16. Click Finish.

  17. In the Confirm window, check the settings you made, and then enter the task name in Task Name.

  18. Click Apply.

    The task is registered, and if the Go to tasks window for status check box is selected, the Tasks window appears.

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