TSR

TSR values are displayed as a percentage. Thus, a value of 100 indicates full responsiveness and a value of 0 indicates no responsiveness in setting up new TCP connections. A value of 0 for the TSR causes this target server to be bypassed when new TCP connection setup requests are distributed to target servers for a DVIPA and port, even if the distribution method is round-robin. Periodically, the distributor sends a new connection request to a target with a TSR of 0, to check whether the responsiveness of that target has improved.

The calculated TSR values are applied to the WLM weights only if there are no stacks participating in the distribution of connections for this DVIPA that are at a release level earlier than z/OS® V1R7. The TSRs are calculated by combining two factors, the target connectivity success rate (TCSR) and the Servers' accept Efficiency Fraction (SEF). These factors are defined as follows:

TCSR

The target connectivity success rate is the measure of how many new TCP connection setup requests (SYNs) sent by the distributing stack to a target stack are received by the target stack. A low value could indicate a problem with the connectivity between the distributing stack and the target stack.

SEF

The Servers' accept Efficiency Fraction measures how well a target server is accepting new TCP connection setup requests and managing its backlog queue.