1. DataGrid WP7 Network Monitoring Robin Tasker, Daresbury Laboratory, 8 March 2001 Network Monitoring Requirements document produced, http://icfamon.dl.ac.uk/papers/WP7/netmon-requirements.html deals with, 1. Purpose (and timescale) of monitoring - immediate “health” of the network - daily/weekly/monthly state of network 2. Network Monitoring metrics 3. Network monitoring software and hardware 4. Plan of campaign Remember that this is all work-in-progress

2. Network Monitoring Metrics: Identified and Discussed 1. Packet loss 2. Round Trip Time, i.e. there and back 3. One-way delay 4. RTT / One-way delay relative to specific route 5. RTT variation (frequency distribution) 6. Jitter 7. Volume (number of Grid bytes exchanged) 8. Per flow application throughput 9. Aggregate network throughput

3. Network Monitoring: Methods Available - Basic tools traceroute, ping, traceping, pchar, MRTG, netperf, etc.. - RIPE NCC Traffic Test Monitoring box (also Surveyor) one-way delay, packet loss, jitter, route information - PingER Software round trip time and frequency, packet loss traceroute facility (includes NIKHEF traceroute) - iperf and Throughput measurement tools - the applications themselves can keep statistics of activities

4. Plan of Campaign - What’s being Proposed Six “pre-testbed” sites identified to trial monitoring methods and the display of data. Aim to be up and running by end March - Deployment of RIPE NCC TTM boxes at each site, being co-ordinated by NIKHEF. Access to data via the Web to show output for the matrix of sites - Deployment of PingER software at each site and Web-based means of analysing and displaying data - Develop Web pages to provide access to this monitoring output i.e see http://ppncg.rl.ac.uk/ppncg/datagrid.html but remember it’s being updated to reflect the work that WP7 is doing - Encourage trial of other monitoring techniques between sites

5. What’s next? - Review network monitoring “products” against requirements; are there better ways of doing this monitoring? - Take advice from other WP's and their requirements - Modify existing monitoring as appropriate and roll out across the emerging testbed sites - Consider how to make these “products” available to the middleware to provide feedback to the applications etc. This requires good input from the other WP’s