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/GroupSorted ascending pledge April 2022 pledge April 2023
ALICE 50 58
AMS 18 18
ATLAS 32 40
ATLAS T3 CERN 2.2 2.2
ATLAS T3 Tokyo 3 3
ATLAS T3 Wisconsin 0.1 0.1
CMS 35 45
CMS T3 CERN 2.2 2.4
COMPASS 2.5 2.5
FASER 1 1
LHCb 26.5 42.8
LHCb T3 CERN 0.3 0.3
LHCf 0.2 0.2
NA61 1.4 1.4
NA62 6.5 6.5
  [PB] [PB]
       
         
         
         
         
NP02 2 2
NP04 1 1
Public instance,other 20 25
SND 0.6 0.6
total sum 205 253
TOTEM 0.6 0.6

Policies

  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%

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Topic revision: r21 - 2022-01-26 - BerndPanzerSteindel
 
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