1. Networking for grid Network capacity Network throughput
Network capacity
Network throughput
What you get
Network monitoring
Datagrid tutorial

2. Network capacity GEANT: European research network
GEANT: European research network
Backbone 10 Gbit/s (6 POP’s)
National research networks from 34 Mbit/s up to 2.5 Gbit/s
Across the Ocean 2.5 Gbit/s
Research on Optical networks (lambda’s)
Netherlight, Starlight, Datatag
Links between CERN, Amsterdam, Chigaco
Datagrid tutorial

3. GEANT backbone topology
Datagrid tutorial

4. GEANT global access
Datagrid tutorial

5. Network throughput TCP performance System performance
TCP performance
Window size > bandwidth * RTT
With 1 Gbit/s and RTT =20ms >2.4 Mbyte
Recovery of lost packets
Different protocal stacks
congestion avoidance (ECN)
Measured with iperf, netperf
System performance
Adapter
System bus
Disk access
Datagrid tutorial

6. Application throughput
GridFTP
Extension of FTP standard
Security
Multiple streams
Multiple disk stripes
Datagrid tutorial

7. Network monitoring Pinger for RTT’s
Pinger for RTT’s
RipeNCC TTM boxes for link latencies or delays
Iperf for TCP network throughput
RTPL for TCP network throughput (netperf)
UDPmon for network throughput
GridFTP logs for application throughput
Datagrid tutorial

8. Network monitoring http://gridmon.sara.nl/
Monitoring data used for
Statistics
Diagnostics
Enable efficient data transport (network cost function)
RIPENCC TTM: NIKHEF – RAL 01-08/12
Iperf: CERN production testbed  Lyon en INFN
Datagrid tutorial

9. Network monitoring Mapcenter : Mapcenter
Mapcenter :
presentation layer for grid information
MDS data, sensor data
Mapcenter
RIPENCC TTM: NIKHEF – RAL 01-08/12
Iperf: CERN production testbed  Lyon en INFN
Datagrid tutorial

10. Network performance Not discussed:
Not discussed:
Other network protocols (replacement for TCP)
QoS
Interactive applications
Communication of distributed applications
RIPENCC TTM: NIKHEF – RAL 01-08/12
Iperf: CERN production testbed  Lyon en INFN
Datagrid tutorial