Alert Analysis of PATHLOAD data

The data being analyzed here is the thrumin values of the pathload data sets. The algorithm is a simplified and modifed version of the anomalous 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 and code

This page was created from the pathload data on Sat Sep 6 10:41:54 2008 for iepm on iepm-bw
by: /afs/slac/package/netmon/bandwidth-tests/v3src/alerts/runperiod
The data includes 121 remote hosts.
EVENT SUMMARY

node = iepm-bw.cern.ch
Analyzed at Sat Sep 6 10:41:55 2008 by /afs/slac/package/netmon/bandwidth-tests/v3src/alerts/triganal on iepm-bw for iepm with data from /nfs/slac/g/net/iepm-bw/iepm-bw.slac.stanford.edu/alerts/pathload/iepm-bw.cern.ch
User selected change threshold = 33, data_column=thrumin (thrumin)
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
history buffer size = 432 (7200 mins) entries, size of trigger buffer = 21 (360 mins) entries, TT = (lastmn - sensitivity*laststd) nt = number of entries in the trigger buffer

line color = magenta

drop in bandwidth greater than 33 %

Bandwidth Data No Events detected

NODENAME lastmean laststdev trigmean trigstdev %change
last-trig %change
lasttrig-trig detected D&T trig-start D&T tdiff trigger buffer

triggers = 0; aborted triggers = 0; alerts = 0; avg. data separation= 16.63 mins; history_buffer_length=432( 119.8 hours); trigger_buffer_length=21( 5.8 hours)