1. Preparations for Reconstruction of Run7 Min Bias PRDFs at Vanderbilt’s ACCRE Farm (more substantial update set for next week)
Charles Maguire et al.
March 14, 2007
Analysis Meeting

2. Proposed Effort and Preparations
ACCRE farm will reconstruct ~10% Run7 Min Bias filtered PRDFs
Reconstruction (PRDFs to nanoDSTs) will be done in near real time
Have confirmed that CPUs and TBytes are available
The nanoDSTs will be transported back to RCF in real time (where?)
Preparations so far
Copied Run4 Au+Au PRDFs to Vanderbilt (same run as for CCF)
Reconstructed with pro.74 library using Fun4Everyone_new.C macro
Re-using machinery from Run6 Level2 reconstruction project
GridFTP server on ACCRE
File handling scripts written by David Silvermyr and myself
Database updating software written by Hugo Valle (still being modified)
Began new network transfer tests BNL <--> ACCRE (results next slide)
March 14, 2007
Analysis Meeting

3. GridFTP Network Transfer Tests
ACCRE to rftpexp01/rftpexp02 (February 14)
Source on a local ACCRE node writing to /data/phenix areas
Two GridFTP jobs running simultaneously, same 8 GByte file
Saw 43.4 MBytes/second ( Mbytes/second)
New issues (2007)
ACCRE engineers have security concerns about GridFTP
Want to meet with BNL people to address those concerns
What protections are other sites taking who use GridFTP
Limited number of boxes at BNL which will be used?
March 14, 2007
Analysis Meeting

4. To Do List (as of March 14)
Resume network testing and development from bufferboxes
Martin (or me with my own 1008 account ) is to do these tests
Will use the Run 6 automated transfer mechanism
Test the production macros and reco libraries for Run7 Min Bias
Cooperation between Carla, Raphael, and VU
Analysis of nanoDSTs for quality control (what should we look at?)
Establish the files return and archiving mechanism (next week)
Disk area at RCF (should it be a dCache?), and how much
Possible tape archiving system at ACCRE (save both input and output)
People on task at VU
Ivan Danchev (research associate)
Hugo Valle (third year graduate student)
Ron Belmont (second year graduate student)
Dillon Roach (second year graduate student)
ACCRE engineers monitoring 24/7
March 14, 2007
Analysis Meeting

5. Backup: What is ACCRE at Vanderbilt?
Advanced Computing Center for Research and Education
Collaborative $8.5M computing resource funded by Vanderbilt
Presently consists of over 1500 processors and 100 TB of disk (VU group has its own dedicated 4.5 TB for PHENIX simulations)
Much work by Medical Center and Engineering school researchers as well as by Physics Department groups
ACCRE eager to continue with physics experiment reconstruction first PHENIX and then CMS (new encouragement from DOE)
Previous PHENIX Use of ACCRE
First used extensively for supporting QM’02 simulations
Order of magnitude increased work during QM’05 simulations
Run6 Level2 PRDFs reconstructed in real time
March 14, 2007
Analysis Meeting