LOFAR Monitoring and Control Edzer Lawerman PVSS Users

LOFAR Monitoring and Control Edzer Lawerman PVSS Users group meeting 2005 © ASTRON

Agenda Ø ASTRON Ø LOFAR, the largest radio telescope in the world Ø Process monitoring and control ? Architecture ? Selection criteria ? Decision ? Result E. Lawerman © ASTRON 2

Astron Our goal is to enable discovery in astronomy Observing facilities E. Lawerman Strong technology development program © ASTRON 3

Telescope developments SKA LOFAR Westerbork 1963 2006 E. Lawerman 2020 © ASTRON 4

Basics of Telescope Arrays 3 km E. Lawerman © ASTRON 5

LOFAR: Low Frequency Array Central super computer Low Frequencies Antenna field Big Bang High speed data network E. Lawerman © ASTRON 6

LOFAR Antenna cluster No complex mechanics Simple sensors and smart software Multiple directions simultaneous E. Lawerman © ASTRON 7

LOFAR architecture Station 1 Station 2 Station 100 Wide Area Network (20 Tbit/s) IBM Blue-gene E. Lawerman © ASTRON Central Processor (34 Tflops) 8

Monitoring and Control Requirements Operator access Platform control • 100 stations Experiment control SHM SAS • 4. 000 I/O per station • 400. 000 I/O total • 16 Central Users • 30 Internet Users E. Lawerman © ASTRON 9

Monitoring and Control HW Architecture LCU 1 LCU 2 LCU 100 CTU 1 CCU 1. . 6 CTU 2 CTU 16 LCU E. Lawerman © ASTRON WTU 1. . 30 10

Monitoring and Control SW Architecture Application Layer Experiment control Platform control Middleware Layer Control Storage LCU 1. . 100 E. Lawerman Communication CCU 1. . 6 © ASTRON User-interface x. TU 1. . n 11

Middleware architecture Control Framework Event driven FW. Navigator State machine supp. DP access library Export A SQL Exp A A A PVSS Storage E. Lawerman Communication © ASTRON Control User-interface 12

PVSS Managers x. TU (20 x) HMI HMI CCU (8 x) APP LCU (100 x) API APP API EV DST C DM DM DRV E. Lawerman © ASTRON C D 13

Example distributed application CCU CTU DP UI 1 CTRL 1 LCU DP CTRL 2 DP DP LTU DP CTRL 3 P DP DP UI 2 DP P CTRL 4 DEV 1 E. Lawerman CTRL 5 DEV 2 CTRL 6 © ASTRON DEV 3 14

UI-framework: Navigator E. Lawerman © ASTRON 15

Navigator: Panel view E. Lawerman © ASTRON 16

Navigator: Trend view E. Lawerman © ASTRON 17

Navigator: Alert view E. Lawerman © ASTRON 18

Performance test E. Lawerman © ASTRON 19

Multiple star configuration CCUl 1 CCU C CCU 2 producer ev ev Consumer Consumer LCU 1 LCU 2 LCU 3 LCU 4 LCU L E. Lawerman © ASTRON 20

Results: transport E. Lawerman © ASTRON 21

Results: round-trip E. Lawerman © ASTRON 22

Conclusions Ø PVSS-II used as middle-ware Ø Added: ? Data export ? State machine support ? UI framework (navigator) Ø PVSS-II communication performance ? Good performance (increased w. r. t. previous version) ? Scales linear E. Lawerman © ASTRON 23