HP Multi-Site Traffic Director sa9200 - Manual (Page 19)

C H A P T E R 2 Partial Failures
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Status: OK
This state indicates that the required services behind this service are
available on the associated load balancer. The metrics information for
this service are current and can be used for metric load balancing.
Status: No Services
This state indicates that services other than the one(s) configured as
required for the associated host are not available on the load balancer.
Other services with this same service are available. Metric load
balancing is not available for this service.
Status: No Metrics
This state indicates that the HP Traffic Director is not advertising any
services that use this service. Metric load balancing is not available
for this service.
Status: No Connection
The SA9200 has lost or been unable to establish a connection to the
fulfillment agent on the load balancer. No metrics information on any
services from this load balancer is available. No load balancing
methods are available for this service. It may only participate in Non-
Weighted Round Robin load balancing.
Service Standby
To achieve site service redundancy, customers often want to have
backup services that are completely dark to normal traffic, but are
instantly available to take over for a failed site service. The transition
of traffic from the failed site service to the standby site service occurs
without the need of operator intervention.
The Service Standby feature allows the designation of a site’s
services for standby. If there is a SA9200 located at the site, its
operation is unaffected and continues in resolving queries and
referring to active services. When the SA9200 has detected a failed
service, the failed service is not used in referrals. Once a failed
service has been deemed active again, no further referrals are made to
the standby service.
The determination to use or not use a standby site service is only
made upon receipt of a query that involves the service. Therefore, a
standby service is not activated to replace a failed service until a
query is received, and a failed service is not shown as active until
after a query is received.