C H A P T E R 2 | Partial Failures |
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 Intel Load Balancer is not advertising any services that use this service. Metric load balancing is not available for this service.
Status: No Connection
The 7190 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 7190 located at the site, its operation is unaffected and continues in resolving queries and referring to active services. When the 7190 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.
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