Operational Limits for vSphere Replication 6.x (2102453)
5 minute Recovery Point Objective (RPO)
In vSphere Replication 6.1.x you can use the 5 minute Recovery Point Objective (RPO) if the target and the source sites use Virtual SAN storage. If you change the target site to a site that does not use Virtual SAN, you cannot set the RPO value to less than 15 minutes. The 5 minute RPO is limited to 100 VMs per Virtual SAN cluster.
In vSphere Replication 6.5.x you can use the 5 minute Recovery Point Objective (RPO) if the target and the source sites use VMFS 6.0, VMFS 5.x, NFS 4.1, NFS 3, VVOL and Virtual SAN 6.0 storage and later. The 5 minute RPO can be a applied to a maximum of 100 VMs on VMFS 6.0, VMFS 5.x, NFS 4.1, NFS 3 and Virtual SAN 6.0 storage and later. The maximum for VVOL datastore is 50 VMs.
Maximum number of virtual machines
The maximum number of virtual machines that you can protect by using vSphere Replication 6.x is 2000 per vSphere Replication appliance. The maximum number of virtual machines that you can assign to each vSphere Replication server is 200. So, if you deploy the maximum of 9 additional vSphere Replication servers, the total number of virtual machines that you can protect is 2000, taking into account the replications handled by the vSphere Replication server that is embedded in the vSphere Replication appliance. You can distribute the virtual machines across the vSphere Replication servers as you see fit, so long as no single vSphere Replication server manages more than 200 virtual machines.
NOTE: The maximum of 2000 replications is supported by new deployments of vSphere Replication 6.x after a minor adjustment. See the Solution section below.
If you upgraded an existing vSphere Replication appliance, for example 5.8 to 6.x, you must apply additional configuration to the appliance to enable the support of up to 2000 replications. See Configuring Upgraded vSphere Replication Appliances to Support up to 2000 Replications (KB 2102463).
If you plan to replicate more than 500 virtual machines, you must change the default value for event maximum age at the vSphere Replication appliance:
- In the remote console session to the vSphere Replication appliance, open the
/opt/vmware/hms/conf/hms-configuration.xmlfile for editing.
- Change the event maximum age as follows:
- Restart the HMS service by running the following command:
# service hms restart
- Stop VCTA service by running following command:
# service vmware-vcd stop
NOTE: Stopping this service interrupts the replications to and from the cloud.
NOTE: If a connectivity issue occurs in your environment or the vSphere Replication appliance encounters a problem, the offline or downtime period should not exceed the period set in the hms-eventlog-maxage tag. After the problem is resolved, there must be enough time for the events to be delivered within the maximum age period.
It is possible to create a vSphere Replication setup with more than two sites, in which each site has a vCenter Server instance and a vSphere Replication appliance. If you have more than two sites, you can protect more than 500 virtual machines. For example, you can create a setup with three sites, Site A, Site B, and Site C:
- Site A replicates 1000 virtual machines to site B
- Site A replicates 1000 virtual machines to site C
- Site B replicates 1000 virtual machines to site C
In this example, the total number of replicated virtual machines is 3000, but each site only handles 2000 replications.
- Site A has no incoming replications and 2000 outgoing replications
- Site B has 1000 incoming replications and 1000 outgoing replications
- Site C has 2000 incoming replications and no outgoing replications
By setting up more than two vSphere Replication sites, in which no individual site exceeds 2000 replications, the total number of replications can be greater than 2000.
|vSphere Replication appliances per vCenter Server instance||
|Maximum number of additional vSphere Replication servers per vSphere Replication appliance
|Maximum number of protected virtual machines per vSphere Replication appliance||
|Maximum number of protected virtual machines per vSphere Replication server||200|