HP e-Commerce / XML director server appliance sa8250 - Users Guide

C H A P T E R 4 HP e-Commerce/XML Director Server Appliance SA8250 User Guide
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5. From the drop down menu, click to select the desired Type:
• Primary: Primary servers are immediately available to
accept client requests forwarded from the SA8250.
• Backup: Backup servers are sent requests under only two
circumstances: First, when the primary servers are unable to
meet the configured target response times a backup server
may be used if and only if "backups" is enabled for this
service. Second, backup servers are given requests when a
primary server is unavailable. As primary servers become
inactive, backup servers are brought into service to handle
requests.
• Disabled: Renders the server unavailable to accept client
requests.
NOTE: OPR cannot be
used in conjunction with
Services of type
RICH_HTTP.
6. From the drop down menu, click to select the desired Mode. This
command enables or disables Source Address Preservation
(SAP) on the named server. When Out-of-Path Return (OPR) is
enabled, the user-designated server port is ignored and the
configured service server port is used. By default, SAP is enabled
(and cannot be disabled) when OPR is in effect.
For more details about SAP and OPR, see Chapter 2.
7. Check the appropriate RICH control checkboxes:
• Multi-hop Source Address Preservation: It is possible in
sophisticated network topologies to require that requests pass
through two cascaded SA8250s. In such configurations, the
SA8250 topologically closest to the clients must be configured
with the MSAP feature enabled. In most configurations, the
default setting (MSAP disabled) must be used.
• 606 Error Detection: "606" is a user-defined error code, that is,
you can specify an application level error as a "606 error" so it is
detectable by the SA8250. When 606 Error Detection is enabled,
requests that generate a 606 error are rerouted, transparently to
the client, to the next available server. When disabled, the error is
sent back to the requesting client.
• HTTP Error Detection: When HTTP Error Detection is
enabled, requests that generate HTTP errors 401-405 and 500-
503 are rerouted, transparently to the client, to the next available
server. When disabled, these errors are sent back to the
requesting client.