Howto: using hrStorageTable add 80% line to graph with HRULE

[Dwayne_Dibbley]

using the templates hrStorageTable i am graphing Total and Used space fine. I would like to add a line showing 80% total space to the graph. I am gathering i need a HRULE but the only examples are for bits /bytes ie |80:bits:0:max| there is a CDEF that gets applied to the data sources but adding this only displays 41.6 on a 168GB drive?

Thanks

[gandalf]

Apply a CDEF=CURRENT_DATA_SOURCE,0.8,* to a LINEx item of the total space used selecting the LAST consolidation function. If this consolidation function is NOT available in your rrd files, use MAX or AVERAGE instead
Reinhard