[rrd-users] calculate downtime percent

[nORKy]

Hi,

I'm getting datas from a host uptime value.
When this host is done, it can't get datas (NaN), when the host goes up,
it's new value is 0.

How can I calculate the percent of downtime ?

Is it possible to retreive this value with "rrdtool lastupdate" ? (COMPUTE
DS ??)

I think it's possible, but RPN is difficult for me :)

Thanks you
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