[Xymon] histlogs cleanup

Japheth Cleaver cleaver at terabithia.org
Thu Dec 19 14:46:21 CET 2013

On Wed, December 18, 2013 3:00 pm, Roland Soderstrom wrote:
> Hi,
> I got this xymon ext script checking a Sun StorageTek 6180 array.
> It works quite well, each run generates a lot of status and data.
> The problem is it generates about 35000 files in Xymonserver:
> xymon/data/histlogs/a6180/<test>  a month.
> I'm very interested in keeping history as in graphs and alerts.
> What are these histlogs files used for by the xymonserver?
> If they are used just to generate things as they come in then it's no
> problem deleting them every 2 weeks or so.
> But if they are used to generate graphs or see alerts history etc then you
> really don't want to delete them

The "histlogs" directory is used to store snapshots of status messages
whenever there's a threshold or "color" change. If you drill down on the
history page for a given host+test combo, you can click the color dot at
each timestamp to see what the output or test result was at that moment
(well, when that color/status was first sent for that time period).

35000 files in a host+test directory in a month indicates that, on
average, your test is changing colors 1100/day, which is suspiciously
close to 1440/day, or once a minute.

If you look at the
http://your.server.here/xymon-cgi/history.sh?HISTFILE=a6180.<test> page,
is it flapping green->yellow/red->green (etc)? If so, you might want to
look at the thresholds and logic calculation in the originating script and
verify that it's doing what you want it to do.

If it's going green->purple->green (etc), it's possible you're manually
setting the TTL on the status message too low for the frequency at which
the script is running.

But no, if your script is feeding in to xymond_rrd and the graph display
is actually being handled by the RRD subsystem, then deleting status
history logs won't affect graphing. It *will* mean, that you won't be able
to view a "snapshot" of what the alert was at that moment in time; you'll
just have a record that the color, in fact, went red/yellow, at that
point. (Those records are kept as single lines in per-test files in the
/hist/ directory.



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