TDAQ Week (a very superficial view)

Murrough Landon - 17 December 2002
http://www.hep.ph.qmul.ac.uk/landon/talks

Overview... Towards the DAQ/HLT/DCS TDR

• Agenda
• Network view
• Dataflow, ROS
• Online
• PESA
• DCS
• Deferrals

Agenda and planning

Agenda

• http://documents.cern.ch/AGE/current/fullAgenda.php?ida=a021484
• TDR planning
• Overview and views from different angles
• Sessions dedicated to each subsystem
• Wrapup

TDR planning

• Technical editor: Marc Dobson
• Outline draft prepared (52 empty pages!)
• First draft by end of March 2003
• Submission in June 2003

Views

Network

• Level2 and Event Building network fairly clear
• New proposals for Event Filter network (SFI/subfarm connections)
• Monitoring traffic shape and volume is unclear (Working Group)
• Do the RODs need a separate network from Online control network?

Subsystems (1)

Dataflow

• Overall architecture: basically as before
• But various attempts to multiplex/slice the system to defer costs are being studied
• Hardware multiplexing of Slinks into ROBins not favoured
• Multiplexing of ROBins to ROS possible
• Either with ``flat scaling'' or adding ``slices''
• ``Slices'' have implications for RoIB and Level2

Subsystems (2)

ROS

• Updated ROS URD published recently
• New ROS software has been released
• Combined release with data collection and online soon
• Architecture basically agreed: but still to be validated
• Measurements on bus based ROS: looks good
• No event fragment monitoring from new ROS software(?)
• ...is it required? (Working Group)

Subsystems (3)

Online

• Evolution and regrouping of packages proposed
• Configuration database: read/write access, automatic DAL generation
• Interface to conditions database to be agreed
• Hidden run control states expected (but not defined)
• Distributed error handling and recovery (local expert systems?)
• Will subdetector ROD crates all use similar run controller? (based on ROD/ROS controller skeleton)

Subsystems (4)

PESA

• Core PESA software: well defined schedule of releases
• Very dependent on releases of the offline software (ATHENA)
• E/gamma slice mostly ready, work has started on muon slice

Subsystems (4)

DCS

• Three level architecture as before: global, subdetector and local control stations
• New CIC ``subdetector'' for common infrastructure and controls (eg racks)
• Interaction of DCS with DAQ agreed
• Use of DAQ databases (ie configuration database) to initialise DCS and to record DCS changes (conditions database) not yet so clear
• NB DCS diagrams of all subdetectors dont include level 1