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 status Apr 2021 pledge July 2021 pledge April 2022
  [PB] [PB] [PB]
       
ALICE 35.3 45.5 50
ATLAS 27.6 29 32
CMS 25.6 30 35
LHCb 14 18.8 26.5
TOTEM 0.6 0.6 0.6
LHCf 0.2 0.2 0.2
FASER 1 1 1
SND 0.6 0.6 0.6
         
ATLAS T3 CERN 2.0 2.2 2.4
CMS T3 CERN 2.0 2.4 2.6
LHCb T3 CERN 0.2 0.3 0.4
ATLAS T3 Wisconsin 0.3 0.1 0.1
ATLAS T3 Tokyo 3 3 3
         
COMPASS 2 2.5 3
AMS 12 12 12
NA62 5 5 6
NA61 1.4 1.4 1.4
NP02 1 1 2
NP04 1 1 2
         
Public instance,other 18 22 26
         
total sum 153 179 207

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. The majority of disk space will be available in EOS and only a smaller 'fixed' part in Castor (~10 PB)
  4. The precision of the allocated disk space versus the pledge should not be varying more than +-3%

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Topic revision: r20 - 2021-05-04 - BerndPanzerSteindel
 
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