Adding remote connections

You can configure the storage systems for TrueCopy by adding a remote connection from the primary to the secondary system. Adding the connection and setting up remote paths prepares the systems for TC commands and operations.

Depending on the system configuration, remote connection from the secondary storage system to the primary storage system is also added. For VSP Gx00 models and VSP Fx00 models, perform this procedure in the primary storage system.

Caution

Do not add or delete a remote connection or add a remote path at the same time that the SCSI path definition function is in use.

Before you begin

  • The local and remote systems must be ready for TC operations. See the section on storage system preparation in the TrueCopy User Guide.
  • The data path must be set up. See the section on data path requirements and configurations in the TrueCopy User Guide.
  • The port attributes on the local and remote systems must be configured for TrueCopy. See the section on defining port attributes in the TrueCopy User Guide.
  • The remote system serial number, LDKC, controller ID, path group ID, and port numbers are required.
    NoteWhen using RAID Manager (including Raidcom), the VSP G1000 and G1500, and VSP F1500 serial numbers require a prefix of "3".
  • One of the fields, Round Trip Time, is covered extensively in the planning section on round trip time in the TrueCopy User Guide.
  • Another field, Minimum Number of Paths, is also covered in more detail in the planning section on minimum number of remote paths in the TrueCopy User Guide.
  • Remote path settings are required to perform TC pair operations and check pair status in Device Manager - Storage Navigator. Make sure to complete the procedure. If you cancel remote path settings, you will be unable to perform operations and check status.
  • Operations involving remote paths cannot be performed when changing the firmware. Make sure a firmware change completes before beginning operations involving remote paths.
  • When using virtual storage machine volumes, make sure to specify the physical serial number of the storage system, not the serial number of the virtual storage machine.
  • Operations involving remote paths cannot be performed if changing the microcode or firmware is interrupted due to an error or operation cancellation. Make sure a microcode or firmware change completes before beginning operations involving remote paths.

Procedure

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

  2. In the Storage Systems tree, click Replication Remote Connections.

  3. In the Remote Connections window, click the Connections (To) tab.

  4. In the Connections (To) tab, click Add Remote Connection.

  5. In the Remote Storage System box, specify the following:

    1. For Model, select the storage system model and number. Select 7 for VSP G1000 and G1500, and VSP F1500, 6 for VSP, 5 for USP V/VM, 19 for HUS VM, and 18 for VSP Gx00 models and VSP Fx00 models.

      HUS VM (19) and VSP Gx00 and VSP Fx00 (18) can be selected only when System is selected for Connection Type.

    2. For Serial Number, enter one of the following remote storage system serial numbers.

      - VSP G1000 and G1500, and VSP F1500: 1 to 99999 (5 digits)

      - VSP or USP V/VM: 1 to 99999 (5 digits)

      - HUS VM: 200001 to 265535 (6 digits)

      - VSP Gx00 models and VSP Fx00 models: 400001 to 499999 (6 digits)

      NoteWhen using virtual storage machine volumes, make sure to specify the serial number of the physical storage system, not the serial number of the virtual storage machine.

  6. In the Remote Paths box, specify the following:

    1. For Path Group ID, select the path group ID (00-FF). A storage system can have a maximum of 64 registered path group IDs.

    2. For Minimum Number of Paths, select the minimum number of paths between the remote storage and local storage system. If the number of paths drops below the minimum, the local storage system splits the pair.

      The range is 1-8, and the default is 1.

    3. In the path ports boxes, select the ports used by the remote path.

      You can add more remote paths by clicking the Add Path button. See Configuring additional remote paths for more information.
      NoteSet 1 for Minimum Number of Paths if the local storage system has a TrueCopy pair that contains critical data for disaster recovery. By setting 1, you can continue TrueCopy operation even when there is only one path to the remote storage system.

      To maintain high performance operation in the local storage system, set 2 or a greater value (8 as the maximum number of paths for a path group) for Minimum Number of Paths.

      If the number of paths goes below the minimum number of paths and the TrueCopy pair is split, deciding whether to fence the P-VOL of the pair (to reject all write I/Os) is determined according to the primary volume fence level.

  7. In Select Type, select the port type.

  8. Select the port to use for the local storage system and the remote storage system. If you selected iSCSI for the port type, enter the IP address and the TCP port number for the port of the remote storage system. To add a path, click Add Path. If necessary, you can add a path later in the Add Remote Paths window.

  9. Click Options to access additional settings, which are optional.

    1. For RIO MIH Time, enter an interval in seconds that, if exceeded, causes the data-transfer operation to be reported as failed by the system. The range is 10-100 seconds, and the default is 15. RIO MIH means "remote I/O missing interrupt handler".

    2. For Round Trip Time, enter a time limit for data copy from P-VOL to S-VOL in ms. The range is 1-500 ms, and the default is 1.

  10. Click Finish.

  11. In the Confirm window, review the settings and enter a task name in the Task Name box.

  12. Click Apply to save your settings.

    If you selected Go to tasks window for status, the Tasks window is displayed.

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