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

HP EFS WAN ACCELERATOR DEPLOYMENT GUIDE 17
1 - DESIGNING AN HP EFS
WAN A
CCELERATOR
 Multiple HP EFS WAN Accelerators are deployed in cluster
configurations.
6. Do you have a firewall?
Definition of Terms
The following terms are used to describe features, attributes, and processes in
the HP EFS WAN Accelerator:
 Optimization. The process of increasing data throughput and network
performance over the WAN using the HP EFS WAN Accelerator. An
optimized connection exhibits bandwidth reduction as it traverses the
WAN.
 Scalable Data Referencing (SDR). The proprietary algorithms that allow
an arbitrarily large amount of data to be represented by a small number of
references to the HP EFS WAN Accelerator data store. As data flows
through the HP EFS WAN Accelerator, all TCP traffic is mapped onto
references to data that is stored on either side of the link. This technology
increases WAN network performance and decreases consumed
bandwidth.
 Auto-discovery. Auto-discovery is the process by which the HP EFS
WAN Accelerator automatically intercepts and optimizes traffic on all
Internet Protocol (IP) addresses and ports. By default, auto-discovery is
applied to all IP addresses and the ports which are not secure or
interactive.
 Fixed-Target. Fixed target rules directly specify out-of-path HP EFS WAN
Accelerators near the target server that you want to optimize. You
determine which servers you would like the HP EFS WAN Accelerator to
optimize (and, optionally, which ports), and add fixed-target rules to
specify the network of servers, ports, and out-of-path HP EFS WAN
Accelerators to use.
 Pass-Through. Pass-through describes WAN traffic that traverses the
network unoptimized. You define pass-through rules to exclude subnets
from optimization. Traffic is also passed through when the HP EFS WAN
Accelerator is in bypass mode. Pass-through might be due to in-path rules
or because the connection was established before the HP EFS WAN
Accelerator was put in place or before the HP EFS WAN Accelerator
service was enabled.
 Bypass. The HP EFS WAN Accelerator is equipped with a bypass
interface to prevent a single point of failure. If there is a serious problem
with the HP EFS WAN Accelerator, it goes into bypass mode and the
traffic is passed-through unoptimized.
 Failover. You can deploy redundant HP EFS WAN Accelerators in your
network to ensure optimization continues if there is a failure in one of the
HP EFS WAN Accelerators. You can enable failover support in the
Management Console or you can use the HP EFS WAN Accelerator
command-line interface (CLI).