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Status Future consideration
Workspace z/OS
Categories Communications Server
Created by Guest
Created on Oct 26, 2023

RELATED IDEAS

TCPIP Sysplex Ditributor SERVERWLM low weights management

We have a large database ( 6 DB2 members, more than 10000 DB2 transactions per second) where DDF TCP traffic is balanced with VIPA SERVERWLM algorithm.

In normal condition WLM weights are high enough to spread new sockets in a balanced way. When there is lack of resources it is possible that WLM returns weight 1 for one member and 0 for the others.

From a capacity point of view all members have a similar ( very low ) capacity to process workload. In this scenario Sysplex Distributor routes ALL new incoming sockets to only one member until the weights are refreshed.

If this happens in peak of connections, this is dangerous for service stability.

From a service point of view all systems should be managed as "equal" (like all in 0 weight), routing the workload in round robin.

We opened case TS014380133 to WLM, the response was that this low weights scenario needs to be managed by the exploiter (TCPIP).

Our idea is to implement a new parameter MINIMUM_WEIGHT ( default 0 ), where customer can force Sysplex Distributor a weight as 0.

For example MINIMUM_WEIGHT=2, a 6 member routing weight list of 0 / 0 / 1 / 2 / 0 / 0 will be managed as 0 / 0 / 0 / 0 / 0 / 0.

Thanks

Idea priority High

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