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Storage Requirements for CCRC08 for LHCb.

Further details can be found here and here. In order for LHCB to perform tests during the CCRC08 exercise in February 2008 the following requirements should be satisfied by Tier-1s. Please note that the spaces should not reuse the current T0D1 SRM v1 space.
For details about the sizes of the various space tokens, please refer to this document.

  1. Provide the following storage classes:
    • REPLICA-ONLINE (Tape0Disk1)
    • CUSTODIAL-NEARLINE (Tape1Disk0)
    • CUSTODIAL-ONLINE (Tape1Disk1)
  2. Define the following space token descriptions:
    • LHCb_RAW for the CUSTODIAL-NEARLINE storage class to be used for Real data (RAW)
    • LHCb_RDST for the CUSTODIAL-NEARLINE storage class to be used for Reprocessing
    • LHCb_DST for the REPLICA-ONLINE storage class to be used for Real data (DST)
    • LHCb_FAILOVER for the REPLICA-ONLINE storage class
    • LHCb_M-DST for the CUSTODIAL-ONLINE storage class to be used for Reprocessing

In order for LHCb to perform tests during the CCRC08 exercise in February 2008 the following requirements should be satisfied by the Tier-0:

  1. Provide the following storage classes:
    • REPLICA-ONLINE (Tape0Disk1)
    • CUSTODIAL-NEARLINE (Tape1Disk0)
    • CUSTODIAL-ONLINE (Tape1Disk1)
  2. Define the following space token descriptions:
    • LHCb_RAW for the CUSTODIAL-NEARLINE storage class to be used for Real data (RAW)
    • LHCb_RDST for the CUSTODIAL-NEARLINE storage class to be used for Reprocessing
    • LHCb_FAILOVER for the REPLICA-ONLINE storage class (5TB)
    • LHCb_M-DST for the CUSTODIAL-ONLINE storage class to be used for Reprocessing

Furthermore, the following requirements must be satisfied:

  1. Make available an LHCb specific path (ex. /lhcb) for both tape and disk. LHCb will then create further paths specifying the desired space token, provided that tokens will be decided somewhere in some top levels and will not change for data stored in the leaves of that top directory.
  2. Enable the following group/roles to write into the spaces above:
    • */lhcb/Role=production*
  3. Publish in the GLUE schema the LHCb tokens and path in the GlueVOInfo objects
  4. Publish the size of the Storage Area correspondent to a specific Storage Class both total and available.

For publishing information in the GLUE schema, you can find an example here.

Concerning the access to those spaces, the following table indicates which access will be used (LHCb_USER is not explicitly for CCRC'08, but needed soon):

  Storage Class TRANSFER_WAN TRANSFER_LAN PROCESSING_LAN PROCESSING_WAN
LHCb_RAW T1D0 OUT IN YES -
LHCb_RDST T1D0 - IN YES -
LHCb_M-DST T1D1 OUT IN YES -
LHCb_DST T0D1 IN - YES -
LHCb_FAILOVER T0D1 IN/OUT - - -
LHCb_USER T0D1 IN IN YES -

LHCb have a Twiki page for CCRC08 that can be found here

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Topic revision: r8 - 2008-01-22 - NickBrook
 
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