Initial Full Synchronization of Virtual Machine Files to VMware
vSAN
Storage Is Slow

When using VMware
vSAN
storage and configuring
vSphere Replication
on multiple virtual machines, the initial full synchronization takes a long time to complete.
Configuring
vSphere Replication
on a large number of virtual machines simultaneously when using
vSphere Replication
with
vSAN
storage causes the initial full synchronization of the virtual machine files to run very slowly.
Initial full synchronization operations generate heavy I/O traffic. Configuring too many replications at the same time can overload the
vSAN
storage.
Configure
vSphere Replication
in batches of a maximum of 20 virtual machines at a time.