N3V_HPR_Conn_OOS_Buffers

A high number of out-of-sequence buffers indicates high CPU utilization of the remote z/OS Communications Server address space. This is probably due to network congestion or constrained CPU in the remote z/OS Communications Server address space.

To determine this, the out of sequence buffers metric in the HPR connections table is monitored.

This situation occurs when the value for the out of sequence buffers metric is greater than 100 for two consecutive intervals.

To resolve this problem, use the following procedures:

• Issue a trace route command to determine the most probable routing path.
• Determine if this path is using a secondary or backup routing path. If it is, identify and fix the problem with the primary path.
• Query the routing interfaces on the routing path to determine the number of packets dropped.
• Identify the routers along the routing path with the highest numbers of packets dropped.
• Validate the router configuration parameters.
• Confirm that CPU utilization is high for the remote system (the receive side) z/OS Communications Server address space.
• Redistribute the Communications Server for z/OS workload on the remote system (the receive side) of the HPR RTP connection.

Formula: Out of Sequence Buffers >= 100)