Disk Resource Table

This page is for the IT internal planning of disk resources for the LHC experiments, non-LHC experiments and various other groups.

The unit for all disk space number is [PB] and assumes usable disk space (mirrored/replicated). The mentioned amount of space allocated is the SUM of CASTOR/CTA and EOS space.

Experiment/Group pledge April 2022 pledge April 2023
  [PB] [PB]
ALICE 50 58
ATLAS 32 40
CMS 35 45
LHCb 26.5 42.8
TOTEM 0.6 0.6
LHCf 0.2 0.2
SND 0.6 0.6
ATLAS T3 CERN 2.2 2.2
CMS T3 CERN 2.2 2.4
LHCb T3 CERN 0.3 0.3
ATLAS T3 Wisconsin 0.1 0.1
ATLAS T3 Tokyo 3 3
COMPASS 2.5 2.5
AMS 21 21
NA62 6.5 6.5
NA61 1.4 1.4
NP02 2 2
NP04 1 1
Public instance,other 20 25
total sum 205 253


  1. Usable space is either mirrored RAW space or 2 replicas (conversion factor is 2 between RAW and usable). Any changes in the algorithm or method do not change the pledge values for the experiments in terms of usable space.
  2. Special arrangements like the implementation of recycle bins or backup do not change the pledge of disk space. This has to be agreed with the experiment and the total available disk space is always a zero-sum game.
  3. There is no experiment allocation of disk space in CTA
  4. The precision of the allocated disk space versus the pledge should not be varying more than +-3%

This topic: Main > TWikiUsers > BerndPanzerSteindel > DiskResourcePlanning
Topic revision: r22 - 2022-01-27 - BerndPanzerSteindel
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