HP e-Commerce / XML director server appliance sa8250 - Users Guide
C H A P T E R 2 Prioritization and Policy Groups
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This figure shows an example of the SA8250 routing topology.
SA8250 Routing Topology
Prioritization
and Policy
Groups
Policy groups are containers used to organize services. Service
prioritization uses policy group information to make decisions about
which services should get more or less server resources. Although
the assignment of services to policy groups can be arbitrarily
determined by the operator, effective use requires that each policy
group contain services related by their shared use of server resources.
Services and servers are assigned to Policy Groups at their time of
creation. This is a list of policy group management commands:
config policygroup create <name>
config policygroup delete <name>
config policygroup <name> throttle [enable |
disable]
The policy group framework allows the prioritization of categories of
client requests. Each service defined in a policy group is assigned a
priority within that group and a target response time. When the
average response time of a service exceeds its target response time,
that service is allocated, on the basis of its priority, a greater share of
common server resources to attempt to bring response time back
within the target range (this assumes that the throttling option is
enabled for the policy group).
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