Interface Bandwidth Question

[pshankland]

Hi,

I am using Cacti again after a while out and am having a problem with working out interface bandwidth percentages (again), so any help would be welcome...

From the start... I have created a new CDEF called 'Percentage Bandwidth Utilisation' which is as follows:

Code: Select all

Item #1     Special Data Source: CURRENT_DATA_SOURCE
Item #2     Custom String: 8
Item #3     Operator: *
Item #4     Custom String: |query_ifSpeed|
Item #5     Operator: /
Item #6     Custom String: 100
Item #7     Operator: *

I then have created a GPRINT Preset call Percentage with a value of (%6.2lf%%)

So, when I add an item into the bytes/sec interface graph, I use a type of GPRINT, the CDEF is 'Percentage Bandwidth Utilisation' and the GPRINT Type is 'Percentage'.

With the above settings I get a percentage value, but I am a bit confused with if it is correct or not. Therefore a couple of questions:

1) As an example, if I am using the bytes/sec graph, and the line speed is reporting as 10000000bps and the current max value is 21.32k what should the percentage be?
2) If I wanted to get a percentage for the interface utilisation with the bits/sec graph, how can this be achieved as there is already a CDEF being used 'Turn Bytes into Bits'?

Thanks.

[pshankland]

Typically, as soon as I post I *think* I have worked it out!

The CDEF I created, call Percentage Bandwidth Utilisation, should actually be call Percentage Bandwidth Utilisation (bits) as it does the conversion from bytes to bits for me!!

This then means that when I created a new graph item within the bits/sec graph, I don't need the 'Convert Bytes to Bits' CDEF, I just change it to this new 'Percentage Bandwidth Utilisation (bits)' CDEF.

To get the percentage working for bytes, I just need the following CDEF creating, which I will call 'Percentage Bandwidth Utilisation (bytes)':

Code: Select all

Item #1     Special Data Source: CURRENT_DATA_SOURCE
Item #2     Custom String: |query_ifSpeed|
Item #3     Operator: /
Item #4     Custom String: 100
Item #5     Operator: *

Obviously, I could still have got this wrong so have implemented the two new graph templates onto a single interface and hopefully should get the same percentage

Thanks.

[pshankland]

Dosn't seem to have worked...

Here is the bytes graph:



And here is the bits graph:



As you can see the maximum percentage is different.

Any suggestions?

Thanks.

[TheWitness]

Pete,

PM Rony with your question. Include this post.

Larry

[crazy72]

If you have one, can you post the solution to ur troubles ?



Thanks
Crazy

[pshankland]

Unfortunatly, I didn't get a reply to this one and therefore don't have a solution.