index e43830cd853a74e9c474daddc7bac5e507336a1f..bcad01c8607202dfdf8a72afe2c64671f1fe11d8 100644 (file)
started as a tiny little script for graphing the use of a university's
connection to the Internet. MRTG was later (ab-)used as a tool for
graphing other data sources including temperature, speed, voltage,
-number of printouts and the like.
+number of printouts and the like.
Most likely you will start to use RRDtool to store and process data
collected via SNMP. The data will most likely be bytes (or bits)
units of our data, it just works with dimensionless numbers.
If we had measured our distances in meters, this would have been
-(12'357'000-12'345'000)/300 = 12'000/300 = 40.
+(12'357'000-12'345'000)/300 = 12'000/300 = 40.
As most people have a better feel for numbers in this range, we'll
correct that. We could recreate our database and store the correct
Should become: 18'446'744'073'709'551'800
But really is: 184
Delta: -18'446'744'073'709'550'816
- Correction1: -18'446'744'073'709'550'816
+ Correction1: -18'446'744'073'709'550'816
+ 4'294'967'296 = -18'446'744'069'414'583'520
- Correction2: -18'446'744'069'414'583'520
+ Correction2: -18'446'744'069'414'583'520
+ 18'446'744'069'414'584'320 = 800
Before: 18'446'744'073'709'551'615 ( maximum value )
View both images together (add them to your index.html file)
and compare. Both graphs should show the same, despite the
-input being different.
+input being different.
=head1 WRAPUP