> BTW, I'm currently playing with reading the rrd files, and I have notice than
> lower precision is 1minute.
> as pvestatd send values around each 10s, is this 1minute precision an average
> of 6x10s values send by pvestatd ?
Yes (we also store the MAX)
> I'm currently working on a poc of vm balancing, but I would like to have
> something like 15min of 10s precision (90 samples of 10s).
Why do you need 10s resulution? Isn't 1min good enough?
> So currently I'm getting stats each 10s manually withÂ
> PVE::API2Tools::extract_vm_stats like the ressource api.
> (This use PVE::Cluster::rrd_dump , but I don't understand the ipcc_. code.
> does it only return current streamed values?
> then after the rrdcached daemon is writing to rrd file the average values
> each minute ?)
>
> I don't known if we could have rrd files with 15min of 10s precision ? (don't
> known the write load impact on disks)
We use the following RRD conf, step is 60 seconds (see
pve-cluster/src/status.c):
static const char *rrd_def_node[] = {
"DS:loadavg:GAUGE:120:0:U",
"DS:maxcpu:GAUGE:120:0:U",
"DS:cpu:GAUGE:120:0:U",
"DS:iowait:GAUGE:120:0:U",
"DS:memtotal:GAUGE:120:0:U",
"DS:memused:GAUGE:120:0:U",
"DS:swaptotal:GAUGE:120:0:U",
"DS:swapused:GAUGE:120:0:U",
"DS:roottotal:GAUGE:120:0:U",
"DS:rootused:GAUGE:120:0:U",
"DS:netin:DERIVE:120:0:U",
"DS:netout:DERIVE:120:0:U",
"RRA:AVERAGE:0.5:1:70", // 1 min avg - one hour
"RRA:AVERAGE:0.5:30:70", // 30 min avg - one day
"RRA:AVERAGE:0.5:180:70", // 3 hour avg - one week
"RRA:AVERAGE:0.5:720:70", // 12 hour avg - one month
"RRA:AVERAGE:0.5:10080:70", // 7 day avg - ony year
"RRA:MAX:0.5:1:70", // 1 min max - one hour
"RRA:MAX:0.5:30:70", // 30 min max - one day
"RRA:MAX:0.5:180:70", // 3 hour max - one week
"RRA:MAX:0.5:720:70", // 12 hour max - one month
"RRA:MAX:0.5:10080:70", // 7 day max - ony year
NULL,
};
Also See: man rrdcreate
So no, you do not get 10s precission from RRD.
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