Question

I have some old rrdtool databases, for which the exact creation recipe has long been since lost. I need to create a new database with the same characteristics as the current ones. I’ve dumped a couple of old databases and pored over the contents but I’m not sure how to interpret the metadata. I think it appears in the following stanzas

<cf> AVERAGE </cf> <pdp_per_row> 360 </pdp_per_row> <!-- 1800 seconds --> <xff> 5.0000000000e-01 </xff> 

There are four such stanzas, which correspond to the way I recall the round-robin cascading was set up. Has anyone already done this, or can give me pointers as to how to clone a new empty rrd database from an existing one? Or show me where I missed this in the documentation.

Answer 1

rrdtools’ rrdinfo is your friend!

It will tell you how the rrd file’s data source(s) and archive(s) were created. Example

$ rrdtool info random.rrd filename = 'random.rrd' rrd_version = '0001' step = 300 last_update = 955892996 ds[a].type = 'GAUGE' ds[a].minimal_heartbeat = 600 ds[a].min = NaN ds[a].max = NaN ds[a].last_ds = 'UNKN' ds[a].value = 2.1824421548e+04 ds[a].unknown_sec = 0 ds[b].type = 'GAUGE' ds[b].minimal_heartbeat = 600 ds[b].min = NaN ds[b].max = NaN ds[b].last_ds = 'UNKN' ds[b].value = 3.9620838224e+03 ds[b].unknown_sec = 0 rra[0].cf = 'AVERAGE' rra[0].pdp_per_row = 1 rra[0].cdp_prep[0].value = nan rra[0].cdp_prep[0].unknown_datapoints = 0 rra[0].cdp_prep[1].value = nan rra[0].cdp_prep[1].unknown_datapoints = 0