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

86 8 - PROXY FILE SERVICE DEPLOYMENTS
Because file and record locking is directed between the client and the
server, the native-file system, operating system, and network file system
protocols protect the data from concurrent access by multiple users.The
HP EFS WAN Accelerator always consults the origin server in response to
a client request, it never provides a proxy response or data from its data
store without consulting the origin server.
If these constraints present an issue to the your network environment, then
you should not enable PFS.
If you have a network environment that does not require collaborative read-
write access to a common data set by users at different remote sites, then you
can enable PFS.
PFS is appropriate for specific network environments. For example, some
environments merely seek to broadcast a set of read-only files to many users
at different sites. Other environments only need to efficiently and
transparently copy data created at a remote site to a central data center, where
tape archival resources are available to backup the data. In each of these
environments, there is limited collaboration where specific users at different
sites are actively modifying a common set of data.
Use PFS in network environments where it is more effective to maintain a
separate copy of files that are accessed locally by the clients at the remote site.
PFS allocates a portion of the HP EFS WAN Accelerator data store for users to
access as a network file system. If any of the above advantages can benefit your
environment, then using PFS in the HP EFS WAN Accelerator is appropriate.
Prerequisites
for PFS
Before you enable PFS make sure you:
 install and start the HP EFS Remote Copy Utility (HP EFS RCU) on the
origin server. You can install the HP EFS RCU on the origin server or on a
separate Windows host with file share access to the data utilized by PFS.
The HP EFS RCU is available for download from the HP support site
located at www.hp.com. For detailed information, see the HP
StorageWorks Enterprise File Services Remote Copy Utility Reference Manual.
 synchronize the origin server and the HP EFS WAN Accelerator hosting
the PFS shares. Make sure you use the same Network Time Protocol
(NTP) server to synchronize the origin server and the HP EFS WAN
Accelerator. For detailed information about setting the date and time in
the HP EFS WAN Accelerator, see Setting the Date and Time and Setting
NTP Servers.
 configure the HP EFS WAN Accelerator as a member server in the
Windows 2000 domain so that the HP EFS WAN Accelerator can access
the domain controller to authenticate the users accessing its file shares.