Cactiusers.org

Just got Cacti up and runing with all the Plugins I want and .8.7a as the underlying (after updating CactiEZ).../

Installed the latest version of the Plugin Architecture.

Everything *looks* like its working. Getting good graphs.

OK so then I set up thresholds, or like to think I do...

Goto Theshold Template, select the Graph Template :Host MIB - Hard Drive Space

Choose data field HDD_percent

Then I apply the Threshold Template to my host (one Win2k3 machine at the moment, until I get this working again, then take an image of the install).

Then check back in 5minutes and see that all the disk thresholds are RED!!! Ok, I think - lets check the serves - all OK - plenty of room - the fullest has 35% free...

So look again - the Threshold page looks like this:



Thus the Current Value is WAY above the real value of % used... (Which all the graphs show correctly).

Any way to solve this.... Am I doing something wrong?

I am thinking of a work around involving CDEFs but don't really want to do that if I'm being stupid here.

Argon0

OK, looks like the graph template uses a CDEF to get its values, WHY? maybe the hdd_percent data source is broken?

Lets see what I can do with CDEFs in thresholds.

I can do anything I like with the CDEFs as long as I only use the current value...

<groan>

OK so I need to make a new data source.... But how to do that? Using the two data sources to create a third, SHOULD be possible, but is it?

The CDEF is easy a,b,/,100,*
Where a is the htt_used, and b is the hdd_total - the graph does it easily.... But can't see any way to use that in Data sources....

Could run the script and see what it comes back with for hdd_percent, see if there is something I can do there?

But then that'd mean rewriting the script, and probably overwriting when I upgrade next time... Groan...

Anyway - its a challenge...

OK, this is a big problem!!!

What's the point of doing thresholds if you can't do a threshold on %disk space used!!

<groan> The code for the query now uses the script server - so xml, the xml script just returns the total and the used info, not the %used, anybody know how to edit the xml to get it to give %used?

Argon0

BTW- sorry for multi-posting just keeping a track of my thoughts....

OK, worked out where the work needs to be done, but haven't a clue how to do it

CactiEZ:
/var/www/html/scripts/ss_host_disk.php

I guess for modularity the scripts have been changed to take arguments to create outputs, but don't know how to use them yet..

What seems to need to happen is for there to be a step or subrouting to take the arguments as they come out for each index item, and calculate the %used from that....

But that is about as far as I can go for the monent, maybe take a look at it agian with a clear head tomorrow...

I have this working on my Cacti, but it required a modification to thold...

So you create a CDEF:


which takes a 'used' value, and a 'total' value and produces a 'percentage used' value.

So then you can apply that CDEF to a thold set on the hdd_used value from HOST-MIB.

BUT, for ALL_DATA_SOURCES_NODUPS to work in thold, you need a patch which I just attached here. It modifies thold_functions.php to understand ALL_DATA_SOURCES and ALL_DATA_SOURCES_NODUPS, and also improves the calculation of CDEFs.

Unlike altering the ss_host_disk.php, this has the benefit of working for anything else where you are in the same situation that uses SNMP.

This is working for me on my test server, but obviously, make sure you back up the original thold_functions.php :-)

Cool, thanks, weird thing is I'm sure this used to work...

this works for me but I would like to generate an error with % sign at the end of the number. Has anybody seen this type of implementation?

Where does this go in the thold_functions.php file?

top? bottom? replaces it?

THanks.

Can someone get back to me?

where do i add it in the file?

thanks.