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Operational Limits of Site Recovery Manager 5.8 in a Shared Recovery Site (N:1) Configuration (2081866)

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A standard VMware vCenter Site Recovery Manager  configuration has one protection site and one recovery site, with one vCenter Server instance and one Site Recovery Manager Server instance on each site. A shared recovery site (N:1) configuration has multiple protection sites that all recover virtual machines to a single, shared recovery site. In an N:1 configuration, each protection site has its own vCenter Server and Site Recovery Manager Server instances. The recovery site in an N:1 configuration has one shared vCenter Server instance and multiple Site Recovery Manager Server instances that are all registered as extensions to the same shared vCenter Server instance. If you use vSphere Replication, the recovery site has one shared vSphere Replication appliance. You can connect a maximum of 10 protected sites to a shared recovery site.

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.  

Using Site Recovery Manager 5.8 with Array-based Replication in an N:1 Configuration

You can use array-based replication to perform recovery and reprotect in an N:1 configuration with Site Recovery Manager. Performing recovery and reprotect with array-based replication in an N:1 configuration in Site Recovery Manager 5.8 is subject to the same protection and recovery limits as for a standard 1:1 configuration. See Operational Limits for Site Recovery Manager 5.8 (2081158)

Using Site Recovery Manager 5.8 and vSphere Replication 5.8 in an N:1 Configuration

In 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 Operations

Due 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
100
40 (Site Recovery Manager throttles 100 LRO requests down to 40)
Site Recovery Manager Site Pair 2
20
20
Site Recovery Manager Site Pair 3
0
0
Site Recovery Manager Site Pair 4
0
0
Site Recovery Manager Site Pair 5
45
40 (Site Recovery Manager throttles 45 LRO requests down to 40)
TOTALS
165
100

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. 

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