[rrd-users] Re: Question on update

Thomas Erskine thomas.erskine at sympatico.ca
Thu Sep 18 18:41:57 MEST 2003

At 12:19 2003-09-18, Logg, Connie A. wrote:
 >Please clarify for me.  Hummm...my bins are 10 minutes wide on the 10 
 >If I bin a value 1000 at 10:35, the value displayed on that graph is 1000
 >for the 10 minute bin...correct?

No.  Say you give it 1000 at 10:35 and 2000 at 10:45.  It wants to store a 
value at 10:40, so you'll probably end up with a value of 1500 at 
10:40.  You're not giving it a value for a bin, you're giving it a value at 
a particular instant.  From that it interpolates to figure out what the 
value would have been at the correct update time.  It's very fussy about 
getting the updates exactly when they're supposed to come.  If you throw 
them in whenever, don't expect to be able to get back anything except 
approximations of what you put in.

 >Now suppose I add another value (2000) at 10:37. What will be the value for
 >that 10 minute bin? 3000?
 >I am sure that there is something simple I am missing here.
 >-----Original Message-----
 >From: Leigh Sharpe [mailto:lsharpe at pacificwireless.com.au]
 >Sent: Wednesday, September 17, 2003 8:49 PM
 >To: Logg, Connie A.; rrd-users at list.ee.ethz.ch
 >Subject: Re: [rrd-users] Question on update
 >RRDtool calculates the value at ,say, 10:60 based on the values it got at
 >10:50, 10:59 and 10:70.
 >----- Original Message -----
 >> I have an rrd defined for 10 minute intervals.  Sometime I have data
 >> at
 >say 10:50, 10:59, 10:60, 10:70
 >> What happens when I call update each time? In particular, does the
 >> 10:59
 >value clobber the 10:50 value, or are they added together?
 >Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
 >Help        mailto:rrd-users-request at list.ee.ethz.ch?subject=help
 >Archive     http://www.ee.ethz.ch/~slist/rrd-users
 >WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi

Thomas Erskine <thomas.erskine at sympatico.ca> +1.613.591.8490 

Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:rrd-users-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/rrd-users
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi

More information about the rrd-users mailing list