HP StorageWorks Enterprise File Services WAN Accelerator 3.0.4 deployment guide (AG421-96001, March 2007)

18 1 - DESIGNING AN HP EFS WAN ACCELERATOR DEPLOYMENT
 Users and Servers. A site that has users and servers that are accessed
remotely. Typically, users and servers are in a regional office with branch
offices at remote sites that accesses data from remote sites and a data center.
2. Determine what kind of WAN routing infrastructure you have. For example, do
you have one or two WAN routers?
3. How much bandwidth do you use? If you use large amounts of bandwidth, you
need to consider deploying multiple HP EFS WAN Accelerators using a Layer-4
switch, Web Cache Communication Protocol (WCCP), or deploying HP EFS
WAN Accelerators in a static cluster.
4. Choose a network template:
 Physical In-Path. In a physical in-path deployment, the HP EFS WAN
Accelerator is physically in the direct path between clients and servers. The
clients and servers continue to see client and server Internet Protocol (IP)
addresses. Physical in-path configurations are suitable for any location where
the total bandwidth is within the limits of the installed HP EFS WAN
Accelerator. For detailed information, see Chapter 2, “In-Path Deployments.”
 Virtual In-Path. In a virtual in-path deployment the HP EFS WAN
Accelerator is virtually in the path between clients and servers. In a virtual in-
path deployment, clients and servers continue to see client and server IP
addresses. This deployment differs from a physical in-path deployment in that
a packet redirection mechanism is used to direct packets to HP EFS WAN
Accelerators that are not in the physical path of the client or server. Redirection
mechanisms include Layer-4 switches, Web Cache Communication Protocol
(WCCP), and Policy-Based Routing (PBR). For detailed information, see
Chapter 3, “Virtual In-Path Network Deployments.”
 Out-of-Path. In an out-of-path deployment the HP EFS WAN Accelerator is
not in the direct path between the client and the server. In an out-of-path
deployment, the HP EFS WAN Accelerator acts as a proxy. An out-of-path
configuration is suitable for data center locations where physical in-path or
virtual in-path configurations are not possible. For detailed information, see
Chapter 4, “Out-of-Path Network Deployments.”
5. Determine how many HP EFS WAN Accelerators you need for your site:
 One HP EFS WAN Accelerator is typically deployed in network environments
with small to moderate bandwidth requirements.
 Two HP EFS WAN Accelerators are deployed for redundancy in network
environments where network outages cannot be tolerated.
 Two HP EFS WAN Accelerators are deployed in network environments with
multiple WAN links.
 Multiple HP EFS WAN Accelerators are deployed in cluster configurations.
6. Do you have a firewall?