[rrd-users] Re: 'Emptying' an RRD database

[Alex van den Bogaerdt]

On Mon, Mar 17, 2003 at 09:47:32AM -0000, Buttery, Daniel wrote:
> Hi! I've got a lovely database setup that contains our bandwidth utilisation
> figures. I'm thick and can't remember the command I issued to create the
> database, and we now want to monitor a different interface. is there a way I
> can copy the rrd file I currently use and then empty the data from it so I
> can use it with the new interface?

You can dump a database to .xml format, edit that file, then restore
it using another name; no problem.

However, it is better to use the "rrdtool info" command to find out
what parameters you used.  All information is there:

step = 3600                        this is the step size of the rrd
ds[name].type = "GAUGE"            name and type of the first DataSource
ds[name].minimal_heartbeat = 7400  heartbeat setting
ds[name].min = 0.0000000000e+00    minimum allowed rate
ds[name].max = NaN                 maximum allowed rate (in this case: "U")

ds[other].type = "GAUGE"           name and type of next DataSource
[...]                         etc.

rra[0].cf = "AVERAGE"              first RRA stores averages
rra[0].rows = 1488                 1488 of them
rra[0].pdp_per_row = 1             each CDP is one PDP
rra[0].xff = 0.0000000000e+00      xff = 0

rra[1].cf = "AVERAGE"              2nd RRA also stores averages
rra[1].rows = 3660                 3660 of them
rra[1].pdp_per_row = 24            each CDP is 24 PDPs
rra[1].xff = 0.0000000000e+00      xff = 0
[...]                         etc.

This database must have been created using:

rrdtool create some.rrd --step 3600   \
   DS:name:GAUGE:7400:0:U             \
   DS:other:GAUGE:7400:0:U            \
   RRA:AVERAGE:0:1:1488               \
   RRA:AVERAGE:0:24:3660

HTH
Alex
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