Difference: DataStorage (5 vs. 6)

Revision 62015-07-01 - MonikaWielers

 
META TOPICPARENT name="WebHome"

Data Storage

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<		 This page describes where to store your data in order to run over it. In general all data files should be stored on dCache. A small amount of data can be stored on the local cluster for development purposes. afs space can be used to put output files/code that you may wish to share with others.
 
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>		This page describes where to store your data in order to run over it. In general all data files should be stored on dCache. A small amount of data can be stored on the local cluster for development purposes. afs space can be used to put output files/code that you may wish to share with others.
 

On the local cluster

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<		 For small to medium amounts of data it is recommended that you store it in either:
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>
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>		For small to medium amounts of data it is recommended that you store it in either:
 /opt/ppd/scratch
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<		/opt/ppd/month
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>		/opt/ppd/month
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<		 Each has a capacity of 1.6 TB.
 
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>		Each has a capacity of 1.6 TB. Before downloading please check there is enough space left. Typically these directories are not erased periodically, however, this means you should not keep datasets which are no longer needed. If the disks are full you can send a mail to the group asking everyone to clean his/her space. To see who uses most, do 'du --max-depth=1' and then you can also ask people personally if they could reduce their diskspace.
 

On AFS

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<		 There is an /afs cell at RAL which you can find at: 
/afs/rl.ac.uk/
 
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>		There is an /afs cell at RAL which you can find at: 
/afs/rl.ac.uk/
 

On the dCache storage element locally

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<		 Detail instructions on using the dCache element can be found on the DCacheStorageElement page. To make things easier to manage please copy ATLAS datasets into: 
/pnfs/pp.rl.ac.uk/data/atlas/atlasralppdisk/
You can use dq2-get to copy files directly into the dCache space. To do this log into heplnx109.gridpp.rl.ac.uk and do:
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>		 Detail instructions on using the dCache element can be found on the DCacheStorageElement page. To make things easier to manage please copy ATLAS datasets into:
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>		/pnfs/pp.rl.ac.uk/data/atlas/atlasralppdisk/

You can use dq2-get to copy files directly into the dCache space. To do this log into heplnx109.gridpp.rl.ac.uk and do:

 cd $HOME source /afs/cern.ch/atlas/offline/external/GRID/ddm/DQ2Clients/setup.sh voms-proxy-init -voms atlas
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<		dq2-get -S srm://heplnx204.pp.rl.ac.uk:8443/srm/managerv2?SFN=/pnfs/pp.rl.ac.uk/data/atlas/atlasralppdisk/dewhurst user10.janstrube.ganga.data10_7TeV.00152221.physics_L1Calo.merge.AOD.r1239_p134.D3PD_v1.99.0
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>		dq2-get -S srm://heplnx204.pp.rl.ac.uk:8443/srm/managerv2?SFN=/pnfs/pp.rl.ac.uk/data/atlas/atlasralppdisk/dewhurst user10.janstrube.ganga.data10_7TeV.00152221.physics_L1Calo.merge.AOD.r1239_p134.D3PD_v1.99.0
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<		 where you can replace dewhurst with your name and user10.jan with the file you wish to download from the grid. Everybody has read write permission so be careful. Note: For some reason if you try this command while somewhere inside the /pnfs/pp.rl.ac.uk/ directory structure you will get an error saying that the file system is read only.
 
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>		where you can replace dewhurst with your name and user10.jan with the file you wish to download from the grid. Everybody has read write permission so be careful. Note: For some reason if you try this command while somewhere inside the /pnfs/pp.rl.ac.uk/ directory structure you will get an error saying that the file system is read only.
 

On the dCache storage element on the grid

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<		 The advantage of storing data on the grid is that there is alot more avaliable storage space. By Storing data on the grid at RAL local users will be able to run over the data interactively for developing software as well as looking at smaller samples as well as running over the same data as a grid job. The dis-advantage is that you don't have full control over your data and some things can take time.
 
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<		If you wish to copy either ATLAS data that is already on the grid to RAL you can download a small amount using DQ2-get. If you want to run over a larger sample you can request data replication via Data Replication
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>		The advantage of storing data on the grid is that there is a lot more avaiable storage space. By Storing data on the grid at RAL local users will be able to run over the data interactively for developing software as well as looking at smaller samples as well as running over the same data as a grid job. The dis-advantage is that you don't have full control over your data and some things can take time.
 
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>		To download datafiles use rucio. The documentation on rucio can be found here

If you wish to copy either ATLAS data that is already on the grid to RAL you can download a small amount using DQ2-get. If you want to run over a larger sample you can request data replication via Data Replication

 
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<		dq2-put -L SITENAME -s SOURCEDIRECTORY DATASETNAME The SITENAME is: UKI-SOUTHGRID-RALPP_SCRATCHDISK The DATASETNAME needs to follow the Dataset naming rules.
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>		dq2-put -L SITENAME -s SOURCEDIRECTORY DATASETNAME
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>		The SITENAME is: UKI-SOUTHGRID-RALPP_SCRATCHDISK The DATASETNAME needs to follow the Dataset naming rules.
  -- AlastairDewhurst - 2010-01-29
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