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.
By default, this situation does not start automatically and must be manually
started to run.