HP StorageWorks Enterprise File Services WAN Accelerator Deployment Guide (November 2005)

HP EFS WAN ACCELERATOR DEPLOYMENT GUIDE 85
8 - PROXY FILE SERVICE
D
EPLOYMENTS
CAUTION: Do not make changes to the shared files on the origin server while in Local
mode. In Local mode, the HP EFS WAN Accelerator overwrites data on your origin
server. The HP EFS WAN Accelerator copy of the data is considered the master copy.
 Stand-Alone Mode. Provides read-write access to data on a branch office
HP EFS WAN Accelerator. There may or may not be an origin server at
the data center with which the share has to synchronize data to. For
example, if you want to load temporary data that does not need to be
backed up at a data center, you can create a share in Stand-Alone mode
with or without a remote path.
Figure 8-1. PFS Deployment
When to Use
PFS
You must carefully evaluate whether PFS is suitable for your network needs.
Before you enable PFS, consider the following PFS requirements:
 Pre-Identification of PFS files. PFS requires that files accessed over the
WAN must be identified in advance on the remote HP EFS WAN
Accelerator. If the data set accessed by the remote users is larger than the
specified capacity of your model or if it cannot be identified in advance,
then you should have end-users access the origin server directly through
the HP EFS WAN Accelerator without PFS.
 Concurrent Read-Write Data Access from Multiple Sites. Do not use PFS
if your environment requires concurrent read-write access to files at
multiple remote sites. For example, in a network environment where
there are multiple users with read-write access, updating a common set of
centralized files and records over the WAN, the HP EFS WAN
Accelerator without PFS is the most appropriate solution.