Alert Analysis of ABwE Raw available bandwidth data

The data analyzed for alerts is the ABwE exponentially weighted moving average of available bandwidth estimate data for about 40 hosts in 12 countries in N. America (US and Canada), Europe (.ch, .cz, .de, .fr, .it, .nl, .uk) and Asia (.jp, .pk,. su) with bottleneck capacities from 512kbps to 1000Mbps. The data points are measured from SLAC at ~ 1 minute intervals. The Event analysis uses a modified "plateau" algorithm ( ppt, pdf) developed from Automated Event Detection for Active Measurement Systems McGregor A. J and Braun H-W.

Connie Logg and Les Cottrell
Program Logic Manual | Perl pseudo code | Examples of alerts

This page was created from the raw-new ABwE data on Wed Jun 30 18:27:46 2004 for cottrell on hercules by: version 1.3, 6/8/04 of runperiod using threshold=34, statistical_limit = 0.1 and writing data to /nfs/slac/g/net/iepm-bw/bandwidth-tests/eventanalysis/ufl-5. The data goes back 8 days to 6/20/2004 18:00 and includes 1 remote hosts.
EVENT SUMMARY

node = node1.nslabs.ufl.edu
Analyzed: Wed Jun 30 18:27:53 2004 starttime = 6/20/2004 18:00; endtime = 06/29/04 00:00; change threshold = 34, statistical_limit = 0.1, data_column=2
The number of standard deviations that a data value must lie outside the mean to be evaluated as a trigger value is defined by the sensitivity = 2
maximum history buffer size = 797 (1440 mins), length of trigger buff 33 (60 mins)

line color = magenta

drop in bandwidth greater than 34 %, the statistical_limit = 0.1

Bandwidth Data Event Info

NODENAME

lastmean

laststdev

trigmean

trigstdev

%change
last-trig

%change
lasttrig-trig

date&time

trigger buffer

triggers = 0; aborted triggers = 0; alerts = 0; datastart=1087779637; dataend=1088492315; duration=712678 secs; avg. data separation= 1.81 mins; history_buffer_length=797( 24.0 hours); trigger_buffer_length=33( 1.0 hours)