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 2015 pledge April 2016   pledge April 2017
             
ALICE   14500 16800   19200
ATLAS   14000 17000   18000
CMS   15000 16300   17300
LHCb   5500 5800   8500
             
TOTEM   400 600   800
             
ATLAS T3 CERN   1400 1800   2200
CMS T3 CERN   1600 2000   2400
LHCb T3 CERN   200 300   400
           
ATLAS T3 Wisconsin   2000 2000   2000
ATLAS T3 Tokyo   3000 3000   3000
             
COMPASS   1200 1400   1600
AMS   3000 3000   3000
NA48+NA62   1100 2100   2100
             
Public instance   2000 2000   2000
test, debug, bench   4000 4000   4000
E-Science   0 500   500
             
             
AFS   2000 2000   2500
Ceph   2000 3000   4000
Hadoop   2000 4000   6000
Owncloud   100 100   100
             
total sum   75000 87700   99600

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

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

* Oct 2015 * 3 PB extra for ALICE T0

* Apr 2016 * 3 PB extra for CMS, summer conferences

* Jul 2016 * 1.3 PB extra for Tier0 disk

-- BerndPanzerSteindel - 24 March 2016

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Topic revision: r6 - 2016-07-26 - LucaMascetti
 
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