The rrdfetch will give you the average rate for that interval, in bits/sec
If you multiply the returned value by the interval size and divide by 8 you'll
get it in bytes.
rrdtool fetch myfile.rrd AVERAGE -r 86400 -e 1346526000 -s e-24h
ds0 ds1
1346544000: 4.3133558301e+04 2.2494106657e+03
Multiply 43133 (ds0, bits/sec) by 86400 (sec in the interval, 1 day) and divide
by 8 (bit/byte) to get bytes/day... this example makes about 455 MBytes which
sounds reasonable.
You could also use the Routers2 frontend to MRTG/RRD which calculates this for
you and displays it on the page :)
Steve
Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
[email protected]
Ph: +64 9 373 7599 ext 86487
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