Replication

This page allows system administrators to manage replications. You can create, edit, and delete replication tasks. You can also run/stop the syncing and view the information of your replication tasks.

For the best user experience, it is recommended to install the same version of Snapshot Replication on your source server and destination server.

To create a replication task for an iSCSI LUN:

  1. Go to the Replication page.
  2. Click Create.
  3. You will see the Create Replication Task wizard.
  4. Click Next to continue.
  5. Select the location and network type for the destination.
  6. Follow the steps of the wizard to create an iSCSI LUN replication.
    Note: If the destination server is a dual-controller model, you can click on the Advanced Settings button on the Specify the replication destination server in the wizard, and tick Enter additional information for a dual-controller model to enter another controller’s information.

Note:

Manage your replication with VMware vCenter Site Recovery Manager

To delete an iSCSI LUN replication:

  1. Select the iSCSI LUN replication task you wish to delete.
    Note: You can press and hold Ctrl or Shift to select multiple items.
  2. Click Action > Delete.
  3. You will see a confirmation message. Click Delete to confirm the action.

To edit an iSCSI LUN replication:

  1. Select the iSCSI LUN replication task you wish to edit.
    Note: You can press and hold Ctrl or Shift to select multiple items.
  2. Click Action > Edit.
  3. You will see a window containing the following tabs:
  4. In the Partner Server tab, you can edit the partner server information, including the hostname, username, and password. Click Advanced Settings to further edit your iSCSI LUN replication task:
  5. In the Schedule tab, you can configure the following options:
  6. In the Advanced tab, you can tick/untick Enable application-consistent snapshots checkbox to switch between the following consistent states:
  7. Click OK to apply the new settings.

Note:

To view information on an iSCSI LUN replication:

  1. Select the iSCSI LUN replication task you wish to view.
  2. Click Info.
  3. You will see a window containing the following information:

To run the syncing of an iSCSI LUN replication:

  1. Select the iSCSI LUN replication task you wish to sync.
    Note: You can press and hold Ctrl or Shift to select multiple items.
  2. Click Action > Sync.
  3. Enter the description of the snapshot to be taken.
  4. Tick/untick the Lock checkbox to determine whether the snapshot will ignore the retention settings when automatic removal is to be triggered.
  5. Tick/untick Enable application-consistent snapshots checkbox to switch between the following consistent states:
  6. Click OK to confirm the action.

Note:

To stop the syncing of an iSCSI LUN replication:

  1. Select the syncing iSCSI LUN replication task you wish to stop.
    Note: You can press and hold Ctrl or Shift to select multiple items.
  2. Click Action > Stop.
  3. You will see a confirmation message. Click Stop to confirm the action.

One-to-many/Extended Replication

You can create multiple replications for an iSCSI LUN to multiple destinations, forming a one-to-many scheme. You can also create an extended replication for a replicated iSCSI LUN, forming an extended scheme.

Note:

Maximum Number of Replication Tasks

The maximum number of replication tasks varies depending on your Synology Unified Controller models. Please visit Synology's website for information about applied models.

Synology Unified Controller

Retention Policy

This option provides an ideal solution to help you specify the maximum amounts of snapshot versions to save your volume space, but you may need to retain your snapshots for longer periods of time. There are a few things to note about Retention Policy:

Example 1:
If you want to keep daily snapshots for the past 3 months, weekly snapshots for the past 4 to 6 months, and monthly snapshots for the past 7 to 9 months, you need to input 0 for hourly snapshots, 90 for daily snapshots, 24 for weekly snapshots, 9 for monthly snapshots, and 0 for yearly snapshots.

Example 2:
If you want to keep hourly snapshots for the past 2 days, daily snapshots for the past week, weekly snapshots for the past month, and monthly snapshots for the past year, you need to input 48 for hourly snapshots, 7 for daily snapshots, 4 for weekly snapshots, 12 for monthly snapshots, and 0 for yearly snapshots.