Setting up priority queuing
All OSA-Express features in a z/OS environment operating in QDIO mode support priority queuing, which allows the definition of four priority levels based on service differentiation: the way in which you define different traffic types to Communications Server. Once you have defined your traffic types, you can assign them priority levels by defining for each a service level policy. You define service differentiation and service level policy to the z/OS CS UNIX Policy Agent through a policy configuration file.
When you activate the z/OS CS UNIX Policy Agent, it reads the policy
configuration file containing the control statements defining service
differentiation and service level policy. Priority queuing can be
defined in three control statements:
- SetSubnetPrioTosMask statement
- Defines as many as eight unique 8-bit Type of Service (TOS) identifiers and assigns each a priority level.
- PolicyAction statement
- Correlates the TOS identifier and priority with an IP traffic characteristic.
- PolicyRule statement
- Defines the transmission conditions for each category of IP traffic.
See z/OS V2R2.0 Communications Server: IP Configuration Guide for a detailed description of how to set up the z/OS CS UNIX Policy Agent.