Search the VMware Knowledge Base (KB)
View by Article ID
Operational Limits of Site Recovery Manager 5.8 in a Shared Recovery Site (N:1) Configuration (2081866)
This article provides information about the scalability limits for an N:1 configuration with Site Recovery Manager 5.8, for both array-based replication and vSphere Replication.
- For the protection and recovery limits of Site Recovery Manager 5.8 in a standard 1:1 configuration, see Operational Limits for Site Recovery Manager 5.8 (2081158).
- For information about setting up Site Recovery Manager 5.8 in an N:1 configuration, see Installing Site Recovery Manager to Use with a Shared Recovery Site in the Site Recovery Manager 5.8 documentation center.
Using Site Recovery Manager 5.8 and vSphere Replication 5.8 in an N:1 ConfigurationIn an N:1 configuration with vSphere Replication, the secondary vSphere Replication management server is shared across the different Site Recovery Manager Server pairs. You can use vSphere Replication to perform recovery and reprotect in an N:1 configuration with certain limitations.
- In Site Recovery Manager and vSphere Replication 5.8, test recovery, recovery, and reprotect operations can fail in a shared recovery site configuration if the vSphere Replication server experiences a heavy load, resulting in the error
The connection to the remote server is down. Do not perform concurrent operations on more than 200 virtual machines, with a maximum of number of 20 virtual machines per protected site when using Site Recovery Manager 5.8 and vSphere Replication 5.8.
- Site Recovery Manager handles the recovery or reprotect of a virtual machine with vSphere Replication as a long running operation (LRO). Each Site Recovery Manager Server instance on the recovery site throttles the number of LROs that it can send simultaneously to the vSphere Replication appliance on the recovery site to a maximum of 40.
How Site Recovery Manager Throttles Concurrent Long Running OperationsDue to the throttling of the number of LRO requests that Site Recovery Manager Server sends to the vSphere Replication management server, the number of recovery or reprotect operations that you start simultaneously might not match the number of operations that start immediately on the recovery site for each Site Recovery Manager site pair.
Example: Throttling of LROs
Site Recovery Manager Site Pairs
Number of Virtual Machines to Recover or Reprotect Simultaneously
Number of Concurrent LRO Requests that Site Recovery Manager Server Sends to vSphere Replication Appliance
Site Recovery Manager Site Pair 1
40 (Site Recovery Manager throttles 100 LRO requests down to 40)
Site Recovery Manager Site Pair 2
Site Recovery Manager Site Pair 3
Site Recovery Manager Site Pair 4
Site Recovery Manager Site Pair 5
40 (Site Recovery Manager throttles 45 LRO requests down to 40)
In this example, the number of recovery or reprotect operations that are started simultaneously is 165. However, the total number of concurrent LRO requests that the Site Recovery Manager Server instances send to the shared vSphere Replication appliance on the recovery site is 100. The remaining 60 operations on site pair 1 and the remaining 5 operations on site pair 5 start as LROs finish on those site pairs.
Request a Product Feature
To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.