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Strange disk test condition

2 messages in this thread

list Ryan Novosielski · Wed, 26 Mar 2014 02:16:43 -0400 · 
Hi all,

I run Xymon 4.3.12. I see I had an alert from a server earlier tonight at 99% of / full. However, it is 66% now and no evidence that this ever happened on the graph of that filesystem. Is it possible for a disk to fill for a very short period and never hit the graph? I don't know what could have even done that.

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list Henrik Størner · Wed, 26 Mar 2014 13:08:14 +0100 ·
▸ quoted from Ryan Novosielski
Den 2014-03-26 7:16, Novosielski, Ryan skrev:
I run Xymon 4.3.12. I see I had an alert from a server earlier
tonight at 99% of / full. However, it is 66% now and no evidence that
this ever happened on the graph of that filesystem. Is it possible for
a disk to fill for a very short period and never hit the graph? I
don't know what could have even done that.
It is possible, if the change is very large, and it only lasts for a very brief time.

Graphs are handled by rrdtool, which "smoothes out" large changes in values. So if the 99% only lasted for a single poll (5 minutes) and it has now settled at 66%, then it is quite likely that you will see the disk graph going up over a couple of samples to reach the 66% line (try zooming in on the time around the peak).


Regards,
Henrik