RRDtool Miroslav Siket FIO-FS /

February 19, 2004CERN, Monitoring Meeitng2 Outline What is RRDtool Oragnization Components Samples Deployment

February 19, 2004CERN, Monitoring Meeitng3 What is RRDtool It is based on RRD (Round Robin Database) files for storing historic information It is a system to store and display time-series data It's pupose is to visualize time-dependent values that can be of the following nature: GAUGE, COUNTER, ABSOLUTE, DERIVE It uses the following algorithms to keep data: AVERAGE, MIN, MAX, LAST

February 19, 2004CERN, Monitoring Meeitng4 Organization RRDtool stores data in the files of fixed size with n slots per defined period of time Multiple periods of times (with different granularities) Client (using rrdtool) updates rrd files with metric data for each time slot (using timestamp) RRDtool does averaging(min, max,...) on the fly RRDtool provides graphs RRDcgi provides web pages from templates RRDtool provides XML import/export, C and Perl API

February 19, 2004CERN, Monitoring Meeitng5 Some features RRDtool allows some basic mathematical expressions when creating graphs: +,-,*,/,% SIN, COS, LOG, EXP, FLOOR, CEIL LT, GT, LE, GE, EQ IF MIN, MAX, LIMIT... This is useful for dynamically creating user defined views (cluster statistics, utilization graphs,…) RRDtool support several metrics in one file with possibility of adding, reducing their number, time span

February 19, 2004CERN, Monitoring Meeitng6 Examples

February 19, 2004CERN, Monitoring Meeitng7 Deployment For fast metric display possibilities Organized by host/metric_name_id.rrd Client for OraMon to feed data into rrd files Apache + php-rrdtool Dynamical Web pages per cluster/node Utilization and performance graphs Easy to setup/implement