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   31100
ATLAS   18500 25000   27000
CMS   22700 24600   26100
LHCb   7800 10900   12600
             
TOTEM   400 600   800
             
ATLAS T3 CERN   1400 1700   2200
CMS T3 CERN   1400 2000   2400
CMS opendata   100 2000   5000
LHCb T3 CERN   300 400   500
           
ATLAS T3 Wisconsin   2000 2000   2000
ATLAS T3 Tokyo   3000 3000   3000
             
COMPASS   1400 1600   1600
AMS   4000 5000   6500
NA48+NA62   1000 1600   1600
             
Public instance   2000 3000   4000
test, debug, bench   3000 3000   3000
             
             
AFS   1500 1500   1500
Ceph   2000 3000   4000
Hadoop   3000 6000   8000
             
total sum   93000 117800   138400

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%

History and Changes

Apr 2016 3 PB extra for CMS, summer conferences

Oct 2015 3 PB extra for ALICE T0

02. April 2014 allocated 500 TB of extra EOS space on loan for CMS for 2 month

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Topic revision: r9 - 2017-01-31 - BerndPanzerSteindel
 
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