There are known issues currently affecting replication for VMware Database Management Essentials 1.0 on vSphere 6.7 GA and 6.7 U1.
First, there can be an issue where the replication appears to be in progress, but the checksum fails to complete. The replication fails to resolve until the host is rebooted.
Additionally, it is possible that more demand log chunks be scheduled for parallel transfer than the actual number that can be transmitted. If you are replicating a VM that is running on such a host and this coincides with a slow target host or temporary network errors, this might result in replication failure and DiskQueue is full
errors.
These Issues are resolved in vSphere 6.7 U2 and above.
If the environment is encountering either of these issues, but cannot be updated to vSphere 6.7 Update 2 or above, the following steps can be used to work around the behavior and need to be applied to each affected ESXi host:
For additional information regarding the configuration of the advanced settings on an ESXi host, please refer to the following:
Configuring advanced options for ESXi/ESX (1038578)