[Nut-upsuser] occassional problem wtih upslog and apc ups units via snmp ... [NA] status

[Bob Brown]

Os is redhat enterprise, kernel 2.6.18-164.2.1.e15
NUT is apparently 2.4.1
It was installed by tar.

Monitoring a lot of apc UPS units-mostly Smart-UPS of various flavors, also a Silcon DP380E.

Normally works just fine...  "upslog" writes status log every 30 seconds with various parameters..

Every so often, one of the UPS units has a log entry of:

20150812+035542+NA+NA+NA+[NA]+NA+NA+NA

When it normally looks like:

20150813+114309+100.00+115.00+39.00+[OL]+25.00+60.00+1020.00

What does it mean when it  puts NA in the log file?

Recently we had an incident when all of our UPS units, (around 71 of them) got 2 NA records, all at about the same time...we are trying to figure out root cause.


Any ideas on what may cause this kind of behavior?

Thanks.
-Bob
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