Difference between revisions of "RAL Tier1 Computing Element"

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== Service Details ==
== Service Details ==
The [[RAL Tier1]] runs several [[Computing Element|computing element]]s or CEs.  These are
The [[RAL Tier1]] runs several [[Computing Element|computing element]]s or CEs.  These are
'''lcgce02.gridpp.rl.ac.uk''', '''lcgce03.gridpp.rl.ac.uk''', '''lcgce04.gridpp.rl.ac.uk''' and '''lcgce05.gridpp.rl.ac.uk'''.  
'''arc-ce01.gridpp.rl.ac.uk''', '''arc-ce02.gridpp.rl.ac.uk''', '''arc-ce03.gridpp.rl.ac.uk''' and '''arc-ce04.gridpp.rl.ac.uk'''.  
These feed jobs to a remote [[Torque]] batch server currently hosted on '''csflnx353.rl.ac.uk'''
These feed jobs to a large HTCondor pool.
== SubClusters ==
There are currently four [[Glue]]Clusters and [[Glue]]SubClusters published by all CEs. These
SubClusters are identical in every way other than their values for memory. An additional Cluster and SubCluster is published on lcgce03.gridpp.rl.ac.uk and lcgce05.gridpp.rl.ac.uk to provide a 3000MB queue for Atlas.
(Note that this example only shows lcgce02 for clarity, in practice this query would show all CEs)
  $ ldapsearch -x -H ldap://site-bdii.gridpp.rl.ac.uk:2170 \
        -b 'Mds-vo-name=RAL-LCG2,o=grid' '(objectClass=GlueSubCluster)' \
        GlueSubClusterName GlueHostMainMemoryRAMSize
  # lcgce02.gridpp.rl.ac.uk, lcgce02.gridpp.rl.ac.uk, RAL-LCG2, grid
  dn: GlueSubClusterUniqueID=lcgce02.gridpp.rl.ac.uk,GlueClusterUniqueID=lcgce02
  GlueHostMainMemoryRAMSize: 512
  GlueSubClusterName: lcgce02.gridpp.rl.ac.uk
  # 700-lcgce02.gridpp.rl.ac.uk, 700-lcgce02.gridpp.rl.ac.uk, RAL-LCG2, grid
  dn: GlueSubClusterUniqueID=700-lcgce02.gridpp.rl.ac.uk,GlueClusterUniqueID=700
  GlueHostMainMemoryRAMSize: 700
  GlueSubClusterName: 700-lcgce02.gridpp.rl.ac.uk
  # 1000-lcgce02.gridpp.rl.ac.uk, 1000-lcgce02.gridpp.rl.ac.uk, RAL-LCG2, grid
  dn: GlueSubClusterUniqueID=1000-lcgce02.gridpp.rl.ac.uk,GlueClusterUniqueID=10
  GlueHostMainMemoryRAMSize: 1000
  GlueSubClusterName: 1000-lcgce02.gridpp.rl.ac.uk
  # 2000-lcgce02.gridpp.rl.ac.uk, 2000-lcgce02.gridpp.rl.ac.uk, RAL-LCG2, grid
  dn: GlueSubClusterUniqueID=2000-lcgce02.gridpp.rl.ac.uk,GlueClusterUniqueID=20
  GlueHostMainMemoryRAMSize: 2000
  GlueSubClusterName: 2000-lcgce02.gridpp.rl.ac.uk
We have subclusters for 512, 700, 1024 and 2048 megabyte resources named lcgce02.gridpp.rl.ac.uk, 700-lcgce02.gridpp.rl.ac.uk, 1000-lcgce02.gridpp.rl.ac.uk and 2000-lcgce02.gridpp.rl.ac.uk respectively.
A job submitted via an [[Work Load Management|RB]] with [[JDL]] containing a requirement of
  Requirements = (other.GlueHostMainMemoryRAMSize>600) ;
would only match the last three sub clusters and consequently be submitted to the batch system requesting 700, 1000 or 2000 megabytes of memory.
[[Category:RAL Tier1]]
[[Category:RAL Tier1]]

Revision as of 10:24, 11 May 2017

WARNING: information not up-to-date

Service Details

The RAL Tier1 runs several computing elements or CEs. These are arc-ce01.gridpp.rl.ac.uk, arc-ce02.gridpp.rl.ac.uk, arc-ce03.gridpp.rl.ac.uk and arc-ce04.gridpp.rl.ac.uk.

These feed jobs to a large HTCondor pool.