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

18 1 - DESIGNING AN HP EFS WAN ACCELERATOR DEPLOYMENT
Bypass Mode
The HP EFS WAN Accelerator is equipped with one of the following types of
bypass interfaces (depending on your order):
 Two-Port Gigabit Ethernet (Gig-E) Bypass Card
 Four-Port Copper Gigabit-Ethernet Bypass Card
 Two-Port Fiber Gigabit-Ethernet Bypass Card
For detailed information about bypass card status lights, see the HP Enterprise
File Services WAN Accelerator Installation and Configuration Guide.
If there is a serious problem with the HP EFS WAN Accelerator, it goes into
bypass (fail-through) mode to prevent a single point of failure. If the HP EFS
WAN Accelerator is in bypass mode, you are notified in the following ways:
 The Intercept/Bypass status light is active. For detailed information about
the status lights for each of the bypass cards, see the HP Enterprise File
Services WAN Accelerator Installation and Configuration Guide.
 Critical is displayed in the status bar of the Management Console.
 Simple Network Management Protocol (SNMP) traps are sent (if you
have set this option).
 The event is logged to system logs (syslog) (if you have set this option).
 Email notifications are sent (if you have set this option).
In an HP EFS WAN Accelerator in-path configuration, in the case of a failure,
the appliance automatically switches to bypass mode. Traffic that was passed-
through is uninterrupted. Traffic that was optimized might be interrupted,
depending on the behavior of the application-layer protocols. When
connections are restored, they succeed, although without optimization.
When the fault is corrected, new connections that are made receive
optimization: however, connections made during the fault are not. To force all
connections to be optimized, enable the kickoff feature. Generally, connections
are short lived and kickoff is not necessary. Kickoff is suitable for very
challenging remote environments. For detailed information about enabling
the kickoff feature, see the HP Enterprise File Services WAN Accelerator
Management Console User Guide.
TIP: You can close old connections in the Reports: Current Connections page of the
Management Console. For detailed information, see the HP Enterprise File Services WAN
Accelerator Management Console User Guide.