5.8

Table Of Contents
Cause
Every virtual machine in a datastore generates regular read and write operations. Configuring
vSphere Replication on those virtual machines adds another read operation to the regular read and write
operations, which increases the I/O load on the storage. The performance of vSphere Replication
depends on the I/O load of the virtual machines that you replicate and on the capabilities of the storage
hardware. If the load generated by the virtual machines, combined with the extra I/O operations that
vSphere Replication introduces, exceeds the capabilities of your storage hardware, you might experience
slow response times.
Solution
When running vSphere Replication, if response times are greater than 30 ms, reduce the number of
virtual machines that you replicate to the datastore. Alternatively, increase the capabilities of your
hardware. If you suspect that the I/O load on the storage is an issue and you are using VMware Virtual
SAN storage, monitor the I/O latency by using the monitoring tool in the Virtual SAN interface.
Error at Reconfiguring the vSphere Replication Management
Server from the Virtual Appliance Management Interface
When you click Save and Restart in the virtual appliance management interface (VAMI) of
vSphere Replication, the HMS service cannot start, and you can no longer manage replications.
Problem
If you use the virtual appliance management interface (VAMI) to install a new SSL certificate, to change
the IP address of the VRM host, or apply another setting on the VR tab, and you click Save and Restart,
the following error message appears:
Missing command-line argument.
Cause
The OVF environment of the vSphere Replication appliance might be missing or corrupted.
Solution
1 Establish an SSH connection to the vSphere Replication appliance and navigate
to /opt/vmware/etc/vami/.
VMware vSphere Replication Administration
VMware, Inc. 96