Good question.
tSmoke was designed to be a management summary reporting tool. For that
reason, the numbers are averages of RRD values showing downtime (i.e.
having lost more than 10% of the PINGS sent out).
The RRD command which extracts this data is
RRDs::graph "fake.png",
"--start","-604800",
"--end","-600",
"--step","4320",
"DEF:loss=$target:loss:AVERAGE",
"CDEF:avail=loss,UN,0,loss,IF,$pings,GE,0,100,IF",
"PRINT:avail:AVERAGE:%.2lf";
It doesn't really create a PNG file, just reports the PRINTed
information which is the average loss. That number is used by CDEF to
create another number (avail) which is a percentage of how many
timeslots had downtime (defined as above).
So if you've changed any of the Smokeping defaults, you will see a
difference. In addition, you might also have a bad circuit which is
lossy causing there to be 10% failures in more slots... causing the
average availability to look very bad.
I hope this helps.
Dan
-----Original Message-----
Using smokeping.cgi I can see in a weekly report something like:
Median Ping RTT (160.4 ms avg)
Packet Loss: 67.74% average 100.00% maximum 11.03% current
Probe: 10 ICMP Pings (7300 bytes) Every 1800 seconds
BUT with tSmoke the same host returns:
Uptime: 6.19%
I don't know exactly how to interpret this value (6.19%).
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