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TC configuration

Configuring TrueCopy requires you to understand and follow a configuration workflow.

Configuration workflow

You must have Storage Administrator (Remote Copy) role to perform most TrueCopy operations using Device Manager - Storage Navigator.

Configuration consists of the following operations.

(VSP 5000 series) You can also perform these additional procedures prior to the initial copy:

Unless otherwise stated, this user guide assumes a configuration in which the primary storage system connects to the P-VOL and the secondary storage system connects to the S-VOL. The local storage system refers to the storage system connected to the management client or CCI. The remote storage system refers to the system connected to the local storage system.

Defining port attributes (VSP 5000 series)

Bidirectional ports must be set up on the primary and secondary systems for TrueCopy command and data transfer.

Before you begin

  • Storage Administrator (System Resource Management) is required.
  • The number of hosts connected to a Target port must be limited to 128 or fewer to avoid disconnection.
  • See for information about Target, and Bidirectional ports.
  • If you are changing a Target port to a Bidirectional port, prepare the port for the change as follows:
    • Confirm that the port is offline.
    • Disconnect the port from the host.
    • Remove all channel paths to the port.
  • If you are changing a Fibre channel port or iSCSI port from a Bidirectional port to a Target port, prepare the port for the change as follows:
    • Release all pairs using the ports.
    • Delete the paths from the Bidirectional port to the remote storage system.
    • Disconnect the connection from the local storage system to the remote storage system. See Deleting remote connections.

Procedure

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

  2. In the Storage Systems tree, click Ports/Host Groups/iSCSI Targets.

  3. In the Ports/Host Groups/iSCSI Targets window, click the Ports tab, select the port to be changed, and click Edit Ports.

  4. In the Edit Ports window, select a Port Attribute: Bidirectional.

    For all other settings, see the Provisioning Guide for Open Systems.
  5. Click Finish.

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

  7. Click Apply to save your settings.

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, VSP Fx00 models, and VSP E series, 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 Storage system preparation.
  • The data path must be set up. See Data path requirements and configurations.
  • (VSP 5000 series) The port attributes on the local and remote systems must be configured for TrueCopy. See Defining port attributes (VSP 5000 series).
  • The remote system serial number, LDKC, controller ID, path group ID, and port numbers are required.
  • One of the fields, Round Trip Time, is covered extensively in Round trip time option.
  • Another field, Minimum Number of Paths, is also covered in more detail in Minimum number of remote paths option.
  • 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. You can perform operations involving remote paths from CCI even while changing the firmware.
  • 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. You can perform operations involving remote paths from CCI even when a microcode or firmware change is not complete.

In a configuration where VSP E590 or VSP E790 is connected to either of the following storage systems, you cannot perform operations involving remote paths from Device Manager - Storage Navigator on a storage system other than VSP E590 and VSP E790. Perform operations involving remote paths from CCI.

  • VSP G/F350, G/F370, G/F700, G/F900: Earlier than 88-08-01-xx/xx
  • VSP E990: Earlier than 93-04-01-xx/xx

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. (VSP 5000 series) In the Add Remote Connection window, select the Connection Type:

    • For TC, select System (connects system by system).
    • For TCz, select CU (connects CU by CU).

    NoteWhen 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.
  6. In the Remote Storage System box, specify the following:

    1. For Model, select the storage system model and number. Select 8 for VSP 5000 series, 7 for VSP G1x00, VSP F1500, 19 for HUS VM, and 18 for VSP E series, VSP Gx00 models and VSP Fx00 models, and 6 for VSP.

      HUS VM (19) and VSP E series, VSP Gx00 models and VSP Fx00 models (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 5100 and VSP 5500: 1 to 99999 (5 digits)

      - VSP G1x00, and VSP F1500: 1 to 99999 (5 digits)

      - VSP: 1 to 99999 (5 digits)

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

      VSP E590, VSP E790: 600001 to 699999 (6 digits)

      - HUS VM: 200001 to 265535 (6 digits)

      Note
      • When 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.
      • When the remote storage system is VSP 5000 series, specify 5 + serial number (6 digits in total) in CCI, or specify the serial number only (5 digits in total) in Device Manager - Storage Navigator.
      • When the remote storage system is VSP G1x00 or VSP F1500, specify 3 + serial number (6 digits in total) in CCI, or specify the serial number only (5 digits in total) in Device Manager - Storage Navigator.
  7. 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.

  8. In Select Type, select the port type.

  9. 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.

  10. 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 (remote I/O missing interrupt handler) time is the waiting time from when copy starts until when it ends. This value applies to the slots which received the request of copying data between storage systems.
    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.

  11. Click Finish.

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

  13. Click Apply to save your settings.

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

Setting the remote replication options

You can set storage system and CU options for Maximum initial copy activities, Blocked path monitoring, and Blocked path SIM monitoring.

NoteIf iSCSI is used in a remote path, the blocked path monitoring remote replica option must be set to at least 40 seconds (default). If blocked path monitoring is less than 40 seconds, the path might be blocked due to a delay in the network such as many switches in a spanning tree protocol (STP) network or a long distance connection.

Before you begin

You must have the role of Storage Administrator (Remote Copy).

Procedure

  1. Open the Replication window.

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

    2. In the Storage Systems tree, click Replication.

  2. In the Replication window, click Edit Options Remote Replication.

  3. In the Edit Remote Replica Options window, for Copy Type, select TC or TC/TCMF.

  4. Change Storage System Options as needed. Settings apply to the storage system.

    1. For Maximum Initial Copy Activities, specify the number of volumes to be copied concurrently per initial copy operation.

      The range is from 1 to 512 volumes. The default is 64. The default setting might not limit the impact on performance, depending on your number of data paths, pairs, and so on. You should consider these factors when making a selection. When you change the maximum initial copy activities setting, the new setting applies to pairs created or resynchronized after the setting was changed, not to existing pairs.

      If the value is too large, the number of pending processing in a remote storage system increases, and the response time of a remote I/O for the update I/O might be affected. For example, if you set 64 for Maximum Initial Copy Activities, and register 65 TrueCopy pairs, the local storage system starts creating the 64 pairs first. It does not start creating the 65th pair before one of the pairs is synchronized.

    2. For Blocked Path Monitoring, enter the number of seconds for the system to monitor blocked paths. The range is 2-45 seconds, and the default is 40.

      If all paths become monitored because of path error, an MIH may occur in the host. Therefore, the time you specify must be less than the host's MIH timer setting.
    3. For Blocked Path SIM Monitoring, enter the number of seconds for the system to monitor SIMs reported for blocked paths. The range is from 2 to 100 seconds.

    4. For Services SIM of Remote Copy, specify whether or not services SIMs in the remote CU are reported to the host.

  5. Change CU Options as needed. Settings apply to the selected CU only.

    1. Select the CU with the options to be changed, and then click Change CU Options. If you do not want to change CU options, click Finish.

    2. In the Change CU Options dialog box, for Maximum Initial Copy Activities, specify the number of volumes to be copied concurrently per initial copy operation for the CU. The range is from 1 to 16 volumes.

      This option is available only when Maximum Initial Copy Activities is Enable.
    3. For Services SIM of Remote Copy, specify whether or not services SIMs in the remote CU are reported to the host.

    4. Click OK.

  6. In the Edit Remote Replica Options window, click Finish.

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

  8. Click Apply to save your settings.

Completing SIMs for TC (VSP 5000 series)

When the cause of a SIM for TC has been resolved, you need to complete the SIM by using the Complete SIMs (TC) window. Completing the SIM changes the SIM status to Completed and removes the SIM alert from the header of the Device Manager - Storage Navigator window.

NotePerforming this task completes all uncompleted SIMs for both TC and TCz operations. If the cause of any of the SIMs has not been resolved, new SIMs will be issued.

Before you begin

  • Required role: Storage Administrator (System Resource Management)

Procedure

  1. Resolve the cause of the SIM.

  2. Open the Complete SIMs (TC) window.

    In Device Manager - Storage Navigator:
    1. From the Device Manager - Storage Navigator menu, click Actions.

    2. Click Remote Replication Complete SIMs (TC).

  3. If desired, select Go to tasks window for status.

  4. Click Apply.

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