Thanks Bill. This worked great.
One quick question; I'm listing sysUpTime in my probe, along with its
OID. I'm pretty sure it's already being pulled as part of the MIB-II
stuff that gets tacked onto SNMP probes, right? Is there a way to access
it from the MIB-II polling - or does my listing it not cause a second
poll of this OID?
--
matt
"There is one thing stronger than all the armies in the world,
and that is an idea whose time has come." — Victor Hugo
William W. Fisher wrote:
On Jul 27, 2006, at 5:56 PM, Matt Stevens wrote:
I'm writing a custom probe that's fetching some values from a machine
running NET-SNMP. NET-SNMP is returning the values as strings, even
though they're integers.
I'd like to graph the values (ie. PER-SECOND), but the only way I can
get them to show in my probe is to use the DEFAULT type. Which then
displays the values, but doesn't make them chartable.
Is there an easy way to get Intermapper to treat these values as
numbers - or convert them? Doing it in NET-SNMP requires me to do
quite a bit more work than the current method.
I sense there are two questions here. Your first question is how to get
InterMapper to treat values as numbers so you can chart them. By
default, string values are not chartable, and floating point numbers
(with a decimal point) have only the integer value charted. However, in
calculations, the context of the value determines how it is used...
To treat strings as numbers or chart floating point values with more
precision, you need to use the "chartable" macro in your
<snmp-device-display> section instead of the variable name:
${chartable: $str }
If you want to retain precision after the decimal point, you need to
tell InterMapper the decimal format using an optional argument:
${chartable: #.## : $str }
The value part of the chartable macro is a full-blown expression, so you
can pick apart a string using substr or unpack. e.g.
${chartable: substr( $str, 2) }
Your second question (possibly) is that you want to chart the deltas of
the values, rather than the values themselves. To do this with string
values, you need to add an extra step. You have to simulate the
calculation that PER-SECOND automatically does for you.
You'll need to add some CALCULATION variables, one to store the delta,
and the second to store the value of the previous/current counter and
timestamp. You'll most likely get $time from sysUpTime, which is in
hundreths of a second.
val_persec, ($val - $prev_val)/(($time - $prev_time) / 100),
CALCULATION, "intermediate calculation"
prev_val, $val, CALCULATION, "previous value"
prev_time, $time, CALCULATION, "previous time"
This works because all calculation expressions are evaluated top to
bottom in order, and InterMapper retains the results of all variables
between polls.
Regards,
Bill Fisher
Dartware,
LLC____________________________________________________________________
List
archives:http://www.mail-archive.com/intermapper-talk%40list.dartware.com/
To unsubscribe: send email to: [EMAIL PROTECTED]
____________________________________________________________________
List archives:
http://www.mail-archive.com/intermapper-talk%40list.dartware.com/
To unsubscribe: send email to: [EMAIL PROTECTED]
