In a large Site Recovery Manager environment, you might encounter timeout errors when powering on virtual machines on a shared recovery site.
Problem
When you power on virtual machines on a shared recovery site, you see the error message Error:Operation timed out:900 seconds.
Cause
This problem can occur if a single vCenter Server instance manages a large number of virtual machines on the shared recovery site, for example 1000 or more.
Procedure
What to do next
If you still experience timeouts after increasing the RemoteManager timeout value, experiment with progressively longer timeout settings. Do not increase the timeout period excessively. Setting the timeout to an unrealistically long period can hide other problems, for example problems related to communication between Site Recovery Manager Server and vCenter Server or other services that Site Recovery Manager requires.