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The NCP generates statistics records whenever certain internal counters overflow. Generally speaking, the counters for SNA devices overflow fairly frequently because the transmission counters include poll-type transmissions, and so the arrival rate of statistics for those devices is normally high. However, the counters for non-SNA devices include data transmissions only and by default wrap only after 65535 transmissions or 255 temporary errors. The arrival rate for statistics records for these devices can be quite low.
To adjust the statistics arrival rate for SNA and non-SNA devices, specify the SRT NCP generation parameter. You can specify it on a PU macro for an SNA controller or a TERMINAL macro for a non-SNA terminal. We recommend that the parameter be utilized, particularly for non-SNA devices, so that statistics can be kept as current as possible.
Another concern for statistics collection is that of network shutdown. Whenever VTAM varies an NCP inactive, that NCP delivers statistics for all devices connected to it. If the network is shutdown using the Z NET,QUICK command, VTAM varies all NCPs inactive, which then deliver their statistics. However, it is possible that your region is terminating because of the Z NET,QUICK command and therefore will not accumulate those statistics.
We recommend that an orderly network shutdown be implemented whereby all NCPs are made inactive before VTAM is halted.
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