• Configure replication using Unisphere

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    Configure replication using Unisphere

    Configure replication interfaces

    Before you begin

    Obtain the following information for each Storage Processor (SP):

    • IP address associated with the replication interface. Although you can specify an IPv4 or IPv6-based address, ensure that you specify the same type of address for both SPs.
    • IP address mask or prefix length that identifies the associated subnet.
    • Gateway IP address associated with the interface.
    • If applicable, the VLAN ID (between 1 and 4095) you want to associate the replication interface with.
      For the network to continue functioning properly, ensure that you set the VLAN ID only when you have configured the network switch port to support VLAN tagging of multiple VLAN IDs.
    Procedure
    1. Under Data Protection, select Replication > Interfaces.
    2. Perform one of the following actions:
      • To create a replication interface, select the Add icon. On the Create Replication Network Interface window, specify the relevant information:
        • For asynchronous replication, from the Ethernet Port list, select an Ethernet port available.
        • For synchronous replication, from the Ethernet Port list, select Sync Replication Management Port.
          Do not use Sync Replication Management Port for asynchronous replication interfaces.
      • To modify a replication interface, select the interface, and then select the Edit icon. On the Replication Interface Properties window, specify the relevant information.

    Configure replication connections

    Before you begin

    Ensure that you have set up relevant replication interface pairs, one on each SP, on the source and destination systems. Obtain the following information:

    • For remote replication, the IP address and associated user authentication credentials to connect to the remote system.
    • For local replication, the password associated with your user account.
    • The connection mode you want to use for the replication-Asynchronous, Synchronous, or Both. File-based storage resources only support Asynchronous connection mode.
    Procedure
    1. Under Data Protection, select Replication > Connections.
    2. Perform one of the following actions:
      • To create a replication connection, Select the Add icon. On the Create Replication Connection window, specify the relevant information.
      • To modify a replication connection, select the replication connection, and then select the Edit icon. On the Replication Connection Properties window, specify the relevant information.
      • If new replication interfaces were added, or existing replication interfaces were deleted, the remote system connection may become outdated. Select the relevant replication, and then select Verify and Update to update the remote system connection to pick up the latest replication interface changes on the local and remote systems.

    Create a replication session

    Before you begin

    Ensure that you have first created relevant replication interfaces and connections, and then determine the following:

    • The replication mode you want. You can choose from the following options:
      • Asynchronous
      • Manual
      • Synchronous
      The synchronous replication mode is available only for block-based storage resources.
    • The Recovery Point Objective (RPO) for the replication session.
    • The system you want to assign as the replication destination system. This is based on the replication connections configured on the storage system.
    • The name, pool, storage provisioning, and tiering policy you want to use for the destination storage resource. The system will automatically created a destination storage resource as part of this process.
    Procedure
    1. Under Storage, select the storage resource, and then select Edit.
      For file storage, you must first configure replication on the NAS server.
    2. On the Properties window, select the Replication tab.
    3. Select Configure Replication.
    4. In the Create a Session window, specify the relevant information.
      Once you specify the necessary information for the destination storage resource or NAS server, the system will automatically create the storage resource or NAS server on the destination system.

    Manage replication sessions

    A replication session establishes an end-to-end path for a replication operation between a source and destination. The replication source and destination may be remote or local, so the session establishes the path that the data follows as it moves from source to destination.

    If you want to set up a replication session, see Configure replication.

    Procedure
    1. Access the Replication Session Details screen in one of the following ways:
      • If you know the name of the replication session, go to Data Protection > Replication > Sessions.
      • If you know the name of the storage resource or NAS server associated with the replication session, go to the Replication tab on the Properties window of the relevant storage resource or NAS server.
    2. Perform one of the following actions:
      Action Description
      Modify a session
      Select the Edit icon to modify the name and synchronization settings of the session.
      Delete a session
      Select Delete. Deleting a replication session also deletes the internal snapshots used by the session. You can individually delete replication sessions at the source and destination systems. If the connection between the systems is healthy, the session on the destination system gets automatically deleted when you delete the session on the source system.
      You cannot delete a replication when a synchronization is in progress.
      Pause and resume a session
      Select Pause or Resume. A replication session is automatically paused when a failover occurs. Resuming a session from the destination system reverses the direction of the replication. Changes on the destination system are copied over back to the source system at the next RPO interval after a connection is restored.
      Manually synchronize a session
      Select Sync. Changes since the last sync are replicated to the destination system.
      Fail over a session in an unplanned emergency
      Select Failover. In response to an unplanned emergency scenario in which the source has become unavailable, the access modes of the source and destination storage resources are switched. After the failover operation, the destination object's status becomes read/write.
      In this type of failover, any active data transfers are terminated, causing a potential loss of data. If the source site is still available when you perform a failover, the system attempts to change the source object from read/write to read-only.
      Fail over a session in preparation for a planned downtime
      Select Failover with Sync. The destination synchronizes with the source storage resource, the replication session is stopped, and the access modes of the storage resources are switched. After the failover operation, the destination object's status becomes read/write and the source object's status becomes read-only.
      To perform this type of failover, both the source and destination objects of the session must be available.
      Fail back a session
      Select Failback. A failback operation performs switches the access modes of the storage resources following a failover operation. Once the destination synchronizes with the source again, the source storage resource's status returns to read/write and the destination storage resource's status returns to read-only.
      You can perform this action from the destination system only. Both the source and destination storage resources must be available to perform a successful failback operation.
      Any modifications to the attributes of the source storage resource are not automatically synchronized over to the destination storage resource. When a failover occurs, ensure that you modify the attributes of the associated destination storage resource to match the attributes of the source storage resource.

    Configure an override network address for file replication

    If you have file replication configured with a destination site on a different physical network, to ensure minimal downtime during a failover, ensure that you modify the destination NAS server properties to include an override address for the network interface.

    You may still need to manually fail over individual file systems associated with the NAS server.

    To configure an override address on the destination NAS server:

    Procedure
    1. Under Storage, select File > NAS Servers.
    2. On the General tab, select the network interface, and click Edit.
    3. On the Edit NAS Server Network Interface screen, select the Override address checkbox, and specify relevant address information.