1. Off-line & GRID Computing
Emanuele Leonardi
PADME General Meeting - LNF January 2017

2. PADME on-line computing model
Target
32ch
FADC
Spectrometer Veto
192 ch
FADC
High Energy Positron
Veto 32ch
FADC
ECAL
616 ch
FADC
SAC
49 ch
FADC
TPix
65536 ch
TBD
L1 DAQ
1 process per DAQ board
L0 DAQ
1 process per DAQ board
ADC zero suppression (?)
Trigger Distribution System
BTF Beam
Cosmics
SW/Random
L1 DAQ
Event build
Temporary disk buffer
Neutral Filter (Inv) 1 or more ECAL clusters
Charged Filter (Vis) 2 or more tracks
RAW data
Trigger signal
Data flow
Central Data Recording Facility
CNAF (+LNF?)
PADME experiment site
PADME on-line computing model
17/01/2017
E. Leonardi - PADME G.M. - On-line Computing 2

3. DAQ data rates
Detector
DAQ out
MB/s
RAW data
GB/d
TB/365d
RAW event
KB/event
Target
1.26
109 40
24.6
Calorimeter
2.70
234 85
52.8
SAC
1.08 93 34
21.1
E veto
0.60 51 19
11.6
P veto
1.31
113 41
25.6
HEP veto
1.15
100 36
22.5
TimePix
1.50
130 47
29.3
Total
9.60
830
303
187.5
Output estimates assume that zero-suppression is active,
include trigger ADC samples (25%) and a 1% autopass stream (10%),
and do not include ROOT data-compression factor (testbeam: ≈50%)
17/01/2017
E. Leonardi - PADME G.M. - Off-line & GRID Computing

4. E. Leonardi - PADME G.M. - Off-line & GRID Computing
STORAGE - CNAF
CNAF storage system accepts PADME data
100TB tape storage allocated for 2016
10TB buffer area available for automatic data transfer
Data transfer:
Automatic - GRID interface via PADME-VO
Manual - SCP to special user account (leonardi)
Need to set-up GRID host at LNF to enable automatic transfers
All testbeam data (DAQ+RAW) have been copied to CNAF (3.8TB)
17/01/2017
E. Leonardi - PADME G.M. - Off-line & GRID Computing

5. E. Leonardi - PADME G.M. - Off-line & GRID Computing
STORAGE - LNF
KLOE tape library is available at LNF
Same characteristics/costs as CNAF
Willing to grant access to other experiments (e.g. us)
Useful to have two copies of data
Disaster recovery
Tape degradation recovery
Data access optimization
Clarify details in 2017 and request financing for 2018
17/01/2017
E. Leonardi - PADME G.M. - Off-line & GRID Computing

6. E. Leonardi - PADME G.M. - Off-line & GRID Computing
CPU
2000 HepSPEC of GRID computing assigned in 2017
MC production and analysis
Can allocate CPU power at LNF Tier1
Details to be discussed with Elisabetta Vilucchi ASAP
CPU in Tier1 can also be accessed “out-of-GRID”
Good candidate for data reconstruction
Need to define plan before 2018
17/01/2017
E. Leonardi - PADME G.M. - Off-line & GRID Computing

7. E. Leonardi - PADME G.M. - Off-line & GRID Computing
CVMFS
CNAF set up a CVMFS (CERN VM File System) area for PADME
Used to distribute the PADME software environment on the GRID
Reachable only in sites that accept the PADME-VO
Need an explicit configuration at the site
currently visible only at CNAF and at ROMA1 for testing
/cvmfs/padme.infn.it
17/01/2017
E. Leonardi - PADME G.M. - Off-line & GRID Computing