HP StorageWorks Enterprise File Services WAN Accelerator - Manual (Page 43)

HP S TORAGE W ORKS EFS WAN A CCELERATOR M ANAGEMENT C ONSOLE U SER G UIDE 43
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You specify the in-path interface if you plan to have the appliance in the direct path
(the same subnet) as the client and the server in your network. You also set the in-path
gateway (WAN router).
NOTE: You were prompted to configure the in-path interface when you completed the
installation wizard. This section describes how you can modify these settings.
Speed and Duplex
Tips If your network routers do not automatically negotiate the speed and duplex, you must
manually set the speed and duplex for the in-path interface (that is, the HP EFS WAN
Accelerator).
Speed and duplex mismatches can easily occur in a network. For example, if one end
of the link is set at half or full-duplex and the other end of the link is configured to
auto negotiate (auto), the link defaults to half-duplex, regardless of the duplex setting
on the non-auto-negotiated end. This duplex mismatch passes traffic, but it causes
interface errors and results in degraded optimization.
The following are general guidelines to avoid speed and duplex mismatches when
configuring the HP EFS WAN Accelerator:
‹ Routers are often configured with fixed speed and duplex settings. Check your
router configuration and set it to match the HP EFS WAN Accelerator WAN and
LAN settings. Make sure your switch has the correct setting.
‹ After you finish configuring the HP EFS WAN Accelerator, check for speed and
duplex error messages (crc or frame errors) in the Logging, View System Log
page of the Management Console. For detailed information about viewing HP
EFS WAN Accelerator logs, see
“Viewing HP EFS WAN Accelerator Logs” on
page 156 .
‹ If there is a serious problem with the HP EFS WAN Accelerator and it goes into
bypass mode (that is, it automatically continues to pass traffic through your
network), a speed and duplex mismatch might occur when you reboot the HP EFS
WAN Accelerator. To avoid a speed and duplex mismatch, configure your LAN
external pair to match the WAN external pair. For example, auto on the LAN and
WAN and fixed to 100 FULL on both the LAN and WAN.