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Yes, NMIS8 can be configured to store as much performance data as you have disk for.  This is very easy to do when you first install an NMIS system, but can be done later as well. (If you are using the NMIS8 Virtual Machine please check out our instructions on Resizing NMIS VMs.) To store more data, first you need to determine how much more data you would like to store, then plug those numbers into the RRD Calculator Spreadsheet rrd_calccalc2.xls, attached for your convenience, this will tell you what you need to change in the NMIS8 model file  /path/to/nmis8/models/Common-database.nmis

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Code Block
 'db' => {
   'hbeat' => '900',
   'poll' => '300',
   'size' => {
       'reachability' => {
       'step_year' => '288',
       'rows_month' => '2268',
       'rows_year' => '1890',
       'step_day' => '1',
       'step_month' => '24',
       'step_week' => '6',
       'rows_day' => '2304',
       'rows_week' => '1536'
     },
     'interface' => {
       'step_year' => '288',
       'rows_month' => '2268',
       'rows_year' => '1890',
       'step_day' => '1',
       'step_month' => '24',
       'step_week' => '6',
       'rows_day' => '2304',
       'rows_week' => '1536'
     },
     'default' => {
       'step_year' => '288',
       'rows_month' => '2268',
       'rows_year' => '1890',
       'step_day' => '1',
       'step_month' => '24',
       'step_week' => '6',
       'rows_day' => '2304',
       'rows_week' => '1536'
     },
     'metrics' => {
       'step_year' => '288',
       'rows_month' => '2268',
       'rows_year' => '1890',
       'step_day' => '1',
       'step_month' => '24',
       'step_week' => '6',
       'rows_day' => '2304',
       'rows_week' => '1536'
     }
   }
 },
 

This will need to be changed to suit your new scheme, you might like to only keep more interface data, or to change all of them to keep more data.

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I can get these results using the RRD Calculator (which has been updated after ~12 years to include the NMIS8 steps/rows) this is the screen shot, I have changed the default of 5 minutes to 1 minute.

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You will need to change the step and polling interface in the top of the file the defaults are hbeat (heartbeat) 900 and poll 300:

Code Block
    'db' => {
      'hbeat' => '900',
      'poll' => '300',
      'size' => {

The new values from the spreadsheet are 180 and 60, so the change is:

Code Block
    'db' => {
      'hbeat' => '180',
      'poll' => '60',
      'size' => {

The interface entry for the Common-database.nmis model would look like this after the change, the terms steps and rows are from RRDTool, using the year, month, etc is really a nominal name, these are the types and levels of summarisation, typically we summarise by day, week, month, year, but you can do others if needed:

Code Block
themeEmacs
 'interface' => {
   'step_year' => '288',
   'rows_month' => '2268',
   'rows_year' => '1890',
   'step_day' => '1',
   'step_month' => '24',
   'step_week' => '6',
   'rows_day' => '9216',
   'rows_week' => '4608'
 },

This change should be made to the following sections:

  • reachability
  • interface
  • default
  • metrics

After the change to 1 min data for 8 days, the RRD files are larger, an important consideration for overall disk usage.

RRD TypeOld File SizeNew File Size% Increase
Interface (ifInOctets and ifOutOcts)581112 bytes

1244664 bytes

214%
Packet data1933120 bytes

4973616 bytes

257%

 

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