CMS

Goals

• L-Store plugin for root, so that rootio can read (write?) L-Store files
• CMS then uses REDDnet as temporary storage for user analysis (Tier 3 and below)
• Other CMS Applications possible, begin with above.

Current Work in Progress

• Figure out how to get necessary code included in CMSSW
  • Talk to Bill Tannenbaum, Phillipe Canal,...
  • include L-Store code in CMSSW distribution so it is built on platforms correctly for use with rest of CMS software.
  • that way no software for users to download themselves, no changing of configuratino scripts, etc.
  • how test and validate before checking in?
  • how to check code in?
• Figure out all issues needed to integrate with CMS data distribution model
  • phEDeX, TFILE, DBS/DLS,...
• Switch Root plugin to use L-Store version of libxio

Demos

Demos at March 2007 OSG Grid Meeting (UC San Diego)

Can use Vladimir's or Dmitri's analysis for all of below.

Interactive Root

• First upload a file to Depots spread across the WAN, use LORSView to show where and how they go.
• Then read it back in root, show it works.
• Mainly an introduction to the issues.

100 Node ACCRE Run

• each reads its own file from WAN set of depots.
• show speed versus local copies of file (data tethered analysis).

100 CPU Grid Job

• similar to ACCRE Run, each job reads its own file from WAN depots.
• jobs are distributed accross open science grid sites
• demonstrates complete lack of data tether.

To Do To Get Ready

• Run all of the above many times before actual demo!
• Get LORSview upload working
• Figure out how to submit 100 CPU Grid Job.
• Want to run all 100 ACCRE jobs simultaneously? Need to work with ACCRE on that...

Get Rick Cavanaugh to run his analysis

• need most of the stuff needed for "Summer 2007 demo" but maybe not all fully in place.
• he runs himself.
• work with him so he understands full functionality possible.
• work with him to develop ideas for better implementing Summer 2007 demo
  • what docs are needed
  • best approach to getting users using it
  • etc.

Summer 2007 Demo

• A "scratch space" demo for CMS users.
• Use deployed REDDnet resources which should become available June 2007
• Load REDDnet with "hot" data files, convince a few users to try them out
• Must have L-Store code fully integrated with CMS software

Long Term Needs

• L-store version of libxio
• Stable, production REDDnet depot deployment
• L-store software fully integrated with CMS software, and being distributed.

SRM interface

• in principle, this is important for CMS usage.
• Need to get new support person on board with this and up to speed.