VMware Site Recovery uses vSphere Replication to protect individual virtual machines and their virtual disks by replicating them from one vCenter Server instance to another. With this procedure you can add the virtual machines to protection groups and recovery plans.

When you configure replication, you set a recovery point objective (RPO) to determine the maximum data loss that you can tolerate. For example, an RPO of 1 hour seeks to ensure that a virtual machine loses the data for no more than 1 hour during the recovery. For smaller RPO values, less data is lost in a recovery, but more network bandwidth is consumed keeping the replica up to date. The RPO value affects replication scheduling, but vSphere Replication does not adhere to a strict replication schedule.

Every time that a virtual machine reaches its RPO target, vSphere Replication records approximately 3800 bytes of data in the vCenter Server events database. If you set a low RPO period, this can quickly create a large volume of data in the database. To reduce the volume of data that is kept in the vCenter Server events database, limit the number of days that vCenter Server retains event data. See Configure Database Retention Policy in the vCenter Server and Host Management Guide. Alternatively, set a higher RPO value.

vSphere Replication guarantees crash consistency amongst all the disks that belong to a virtual machine. If you use quiescing, you might obtain a higher level of consistency. The available quiescing types are determined by the operating system of the virtual machine.
Note: VMware Site Recovery with enhanced replication capability including 1 minute RPO, auto-scaling, and load balancing, scales to a limit of 4000 protected VMs by provisioning additional ESXi hosts to accommodate the workload requirements. Enhanced replication distributes the replications on all available hosts in the target cluster. Re-balancing of the workload occurs automatically every 30 minutes. The number of replicated VMs per host on the target site depends on, but is not limited to the virtual machines disks size, number of disks, change rate, and RPO.

Prerequisites

  • Verify that the vSphere Replication appliance is deployed at the source and the target sites.
  • Verify that the vSphere Replication appliances are paired.
  • Enhanced replications require both sites of the pairing to be with a minimum version of vSphere Replication 8.8.0.x.
  • Scale-out mode replications require minimum versions vSphere Replication 8.8.0.x and SDDC version 1.22.0.11 on the target site when the target is a VMware Cloud on AWS SDDC.
  • vSphere Replication 8.8 and later requires network encryption for Enhanced replications.
  • Enhanced replications require minimum versions vSphere Replication 8.8.x, vCenter Server 8.0u2, and ESXi host 8.0u2 on the target site when the target is an on-premises SDDC.
  • Enhanced replications require TCP network connectivity on ports 31031 and 32032 from the ESXi hosts on which the replicated VMs are running to the ESXi hosts of the cluster containing the target datastore. Make sure your firewall settings are adjusted accordingly.
  • To enable the quiescing of virtual machines that run Linux guest OS, install the latest version of VMware Tools on each Linux machine that you plan to replicate.

Procedure

  1. In the vSphere Client, click Site Recovery > Open Site Recovery.
  2. On the Site Recovery home tab, select a site pair and click View Details.
  3. Click the Replications tab, select Outgoing or Incoming, and click Create new replication to configure replication.
  4. Accept the automatic assignment of a vSphere Replication server or select a particular server on the target site and click Next.
    Note: To use Site Recovery Manager with enhanced replication, select Enhanced replication.
  5. On the Virtual machines page of the Configure Replication wizard, select the virtual machines you want to replicate and click Next.
  6. On the Target datastore page, select a datastore or a datastore cluster on which to replicate files.
    When replicating multiple virtual machines, you can configure a different target datastore for each virtual machine. You can also use different target datastores for the various disks.
    Note: All datastores that are selected as the target of the replicated disks must be read and write accessible by at least one host on the target site.

    If after configuring the replication the read and write access gets broken, the replication will get into an unrecoverable state.

    1. (Optional) Select the Select seeds check box.
      Replication seeds can reduce the network traffic during the initial full synchronization, but unintended use of replication seeds might lead to data loss.
    2. (Optional) Select or deselect the Auto-include new disks in replication check box.
      Keep the check box selected to automatically include new disks in the replication, with the same replication configuration as the source virtual machine. Disk format for the automatically included disks is determined the following way: If all replicated disks use the Same as source format, the Same as source format is applied to the automatically included disks. If that is not the case, but all replicated disks use the same format, for example Thin provision, the same format ( Thin provision) is applied to the automatically included disks. If all replicated disks use different formats, the Same as source format is applied to the automatically included disks.

      If Auto-include new disk is deactivated, adding a new disk will cause the replication to enter an Error state until the new disk is either included or excluded from the list of the replicated disks through the Reconfigure Replication wizard. You must avoid virtual machine disk changes untill the replication is in OK state.

    3. (Optional) Activate or deactivate the Configure datastore per disk view.
      If you activate the Configure datastore per disk view, you can specify a different datastore for each disk. You can also include or exclude existing disks from replication, and you can also activate or deactivate the automatic replication of new disks. To include or exclude a new or existing disk from being replicated, select or deselect the respective disk.
    4. Click Next.
  7. (Optional) On the Replication mapping tests page, test the connectivity between all compute resources in the replication.
    1. To test the connectivity in a specific cluster pair, select a cluster pair and click Run Test.
    2. To test the connectivity in all cluster pairs, click Run All Tests.
    3. Click Next.
  8. (Optional) On the Select seed page, review the suggested replication seeds and change them if necessary.
    You can select seed files for each virtual machine disk and search for seeds by using the drop-down menu and clicking Browse.
    1. Select the The selected seeds are correct check box and click Next.
    The replica files for the disk are written in the seeds file directory.
  9. On the Replication settings page, configure the replication settings for the virtual machine.
    1. Use the RPO slider to set the acceptable period for which data can be lost if a site failure occurs.
      The available RPO range is from 5 minutes to 24 hours. If you select Enhanced replication, the available RPO range is from 1 minute to 24 hours.
    2. (Optional) To save multiple replication instances that can be converted to snapshots of the source virtual machine during recovery, select Enable point in time instances and adjust the number of instances to keep.
      Note: You can keep up to 24 instances for a virtual machine. For example, if you configure vSphere Replication to keep 6 replication instances per day, the maximum number of days you can set is 4 days.

      The number of replication instances that vSphere Replication keeps depends on the configured retention policy, but also requires that the RPO period is short enough for these instances to be created. Because vSphere Replication does not verify whether the RPO settings will create enough instances to keep, and does not display a warning message if the instances are not enough, you must ensure that you set vSphere Replication to create the instances that you want to keep. For example, if you set vSphere Replication to keep 6 replication instances per day, the RPO period must not exceed 4 hours, so that vSphere Replication can create 6 instances in 24 hours.

    3. (Optional) Activate quiescing for the guest operating system of the source virtual machine.
      Note: Quiescing options are available only for virtual machines that support quiescing. vSphere Replication does not support VSS quiescing on Virtual Volumes.
    4. (Optional) Select Enable network compression for VR data
      Compressing the replication data that is transferred through the network saves network bandwidth and might help reduce the amount of buffer memory used on the vSphere Replication server. However, compressing and decompressing data requires more CPU resources on both the source site and the server that manages the target datastore.
    5. (Optional) Activate the network encryption of the replication traffic.
      If you select Enhanced replication, this option is automatically turned on and cannot be deactivated. If you configure a replication of an encrypted VM, this option is automatically turned on and cannot be deactivated.
    6. (Optional) Activate DataSets replication.
  10. (Optional) On the Protection group page, you can optionally add the virtual machine to a protection group.
    Option Description
    Add to existing protection group Adds the virtual machine to an existing protection group.
    Add to new protection group Adds the virtual machine to a new protection group. If you select this option, you must enter protection group name.
    Do not add to protection group now Select this option if you do not want to add the virtual machine to a protection group.
  11. (Optional) On the Recovery plan page, you can optionally add the protection group to a recovery plan.
    Option Description
    Add to existing recovery plan Adds the protection group to an existing recovery plan.
    Add to new recovery plan Adds the protection group to a new recovery plan. If you select this option, you must enter recovery plan name.
    Do not add to recovery plan now Select this option if you do not want to add the protection group to a recovery plan.
  12. On the Ready to complete page, review your settings, and click Finish.