Here's another one.
4. Use LSL calculations to approximate the dataset as a line, and use that.
VDEF:slope=x,LSLSLOPE
VDEF:base=x,LSLINT
CDEF:infill=slope,COUNT,*,base,+
CDEF:newx=x,UN,infill,x,IF
The downside is that you'll likely get a disconnect when switching between
the real and infill data. The upside is that it wont be a horizontal line and
no need to store invalid data.
5. Use PREDICT function to fill in with averages of previous day's data.
CDEF:infill=36000,1,1800,x,PREDICT
CDEF:newx=x,UN,infill,x,IF
This hops back 10hr (the size of your available-data window) and fills in
with a 30min average of that data.
Of course, all of these infill ones have the downside that you're displaying
made-up data for the unknown period... it would be simple enough to make the
RRD graph function display made-up data using a different colour of line, so
that you can see which parts are true and which are cosmetic.
Steve
Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
[email protected]<mailto:[email protected]>
Ph: +64 9 373 7599 ext 86487
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