The primary role of the proxy server is to provide an optimal route for backup traffic and enable efficient data transfer. Therefore, when deploying a backup proxy, you must understand the connectivity between the backup proxy and the storage with which it is working.
Depending on the type of connection, the backup proxy can be configured in one of the following ways (starting from the most efficient):
•A physical machine used as a backup proxy should have direct SAN access to the storage on which VMs reside, via a direct Fiber Channel or iSCSI connection. This way, the backup proxy can retrieve data directly from the storage in the most efficient manner.
•A virtual machine used as a backup proxy will use the VMware Hot-Add feature to access VM disks on the storage. This type of proxy also enables LAN-free data retrieval.
Guidelines for sizing and configuring your proxy servers will be provided in the Planning for Proxies section later in this document.