[smokeping-users] RRDtool database settings

[Leoš Bitto]

Hello everybody,

I have succesfully set up SmokePing 2.0rc5 with RRDtool 1.2.11, and 
sudddenly I found that the resolution of my gathered data (I run FPing 
every 60 seconds) is lower when viewing older data. I think that I found 
what is causing this: it's the parameter "AVERAGE  0.5   1  1008" in the 
configuration file. If I understand it correctly, it means that the data 
with my desired resolution (1 minute) are kept only for the 1008 last 
occurences (meaning less than 17 hours). Older data are available only 
with resolution 12 minutes (covered by "AVERAGE  0.5  12  4320"), and I 
guess that even older data (older that 12*4320 minutes) would be 
available with resolution 144 minutes (covered by "AVERAGE  0.5 144 
720"). Here are my questions:

1) Are there any limitations when choosing those RRDtool database 
parameters? Currently I am aware of the disk space requirements only.

2) How can those RRDtool database parameters be configured differently 
for different hosts (when using the FPing probe)?

3) What needs to be done to keep the data which I have already gathered 
when I decide to change those RRDtool database parameters?

Thanks is advance for any responses.


Leos

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