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 [TB] and assumes usable disk space (mirrored/replicated). The mentioned amount of space allocated is the SUM of Castor and EOS space.

Experiment/Group   status Feb 2017 pledge 2017 (May)   request 2018
             
ALICE   17600 22400   27400
ATLAS   18500 25000   26000
CMS   22700 24600   26100
LHCb   7800 10900   12000
             
TOTEM   400 600   800
             
ATLAS T3 CERN   1240 1500   1750
CMS T3 CERN   1200 1500   1750
CMS opendata   100 2000   5000
LHCb T3 CERN   100 200   200
           
ATLAS T3 Wisconsin   2000 2000   2000
ATLAS T3 Tokyo   3000 3000   3000
             
COMPASS   2000 2000   2000
AMS   4000 5000   6500
NA48+NA62   2000 2000   2000
             
Public instance,default   3000 4000   4000
test, debug, bench   3000 3000   3000
             
             
AFS   1500 1500   1500
Ceph   2000 3000   4000
Hadoop   3000 6000   8000
             
total sum   93000 119300   137600

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: r12 - 2017-05-02 - BerndPanzerSteindel
 
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