I am collecting data from an SNMP counter into an rrdtool database. I'd like to be able to plot effectively the average number of connections over time. So, for example, if I get (at 5 minute intervals): 5, 10, 12, 20, 23 I want to plot the difference from the previous, value, i.e.: <anything>, 5, 2, 8, 3
If I store this data in a COUNTER datatype, all I get is the percentage change over the previous value, which is not what I want. I thought I could do this using PREV, but I can't see how... DEF:a=$FILENAME:total:MAX CDEF:b=a,PREV,UN,a,PREV,IF,- woudl give me: 0, 10, 2, 18, 5 which is not really what I want. I can't do CDEF:b=PREV,UN,a,PREV,IF CDEF:c=a,b,- CDEF:b=a because I can't reassign b. Is there anything I can do to get this to work? Thanks in advance, Alison Andrew Systems Group Carnegie Mellon University -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/rrd-users WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi
