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.
- Verify that the vSphere Replication appliance is deployed at the source and the target sites.
- Verify that the vSphere Replication appliances are paired.
- 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.
- In the vSphere Client or the vSphere Web Client, click .
- On the Site Recovery home tab, select a site pair and click View Details.
- Click the Replications tab, select Outgoing or Incoming, and click New to configure replication.
- Select the virtual machines you want to replicate and click Next.
- Accept the automatic assignment of a vSphere Replication server or select a particular server on the target site and click Next.
- On the Target datastore page, select a datastore on which to replicate files and click Next..
When replicating multiple virtual machines, you can configure a different target datastore for each virtual machine.
- (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.
- (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 you enable the Configure datastore per disk view, you can enable or disable the automatic replication of new disks by toggling the New Hard disk switch.
- Click Next.
- (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 dropdown menu and clicking Browse.The replica files for the disk are written in the seeds file directory.
- Select the The selected seeds are correct check box and click Next.
- On the Replication settings page, use the RPO slider to set the acceptable period for which data can be lost in the case of a site failure.
The available RPO range is from 5 minutes to 24 hours.
- (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.
- (Optional) Select the quiescing method 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.
- (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.
- (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.
- (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.
- On the Ready to complete page, review your settings, and click Finish.