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

HP STORAGEWORKS ENTERPRISE FILE SERVICES WAN ACCELERATOR DEPLOYMENT GUIDE 19
1 - DESIGNING AN HP EFS
WAN A
CCELERATOR
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 or ports 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 or it is not powered on, 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).
Bypass Mode
The HP EFS WAN Accelerator is equipped with one of the following types of bypass
interfaces (depending on your order):
 HP EFS N4c WAN Accelerator 4-port NIC
 HP EFS N2c WAN Accelerator 2-port NIC
 HP EFS N2f WAN Accelerator 2-port NIC