How to set up FZK for LHCb (v0.1)

Evaluation by Maarten Litmaath (CERN)

References

Amount of disk to be provided

  • 182TB

Inter-site I/O rates (to/from space token)

T1<-T0 6.3 MB/s to LHCb_BUFFER
T1<-T1 11.6 MB/s to LHCb_DST, LHCb_MC_DST
T1<-T2 0.2 MB/s to ...
       
T1->T2 11.4 MB/s from LHCb_M-DST, LHCb_MC_M-DST, LHCb_DST, LHCb_MC_DST
T1->T1 8.8 MB/s from LHCb_M-DST, LHCb_MC_M-DST

Buffers to be considered

  • WAN buffer
  • LAN buffer : "pin" raw data for a few days: 3d * 6.3 MB/s = 1.6 TB

Space token sizes for FZK and total, corresponding storage class

Space Token Description FZK size in TB Total Size in TB Storage Class Notes
LHCb_BUFFER 16 120 T1D1 T1D0 transition after processing
LHCb_M-DST 14 110 T1D1  
LHCb_DST 87 665 T0D1  
LHCb_MC_M-DST 25 190 T1D1  
LHCb_MC_DST 25 190 T0D1  
LHCb_USER 15 115 T1D1 Small Files
TOTAL 182 1390

Real and MC data together, I/O rates

LHCb_BUFFER 16 T1D1 6.3 MB/sec in from T0 6.3 MB/sec out to tape
  6.3 MB/sec out to reco jobs
3.6 MB/sec in from reco  
(320/560*6.3)  
  3.6 MB/sec out to tape
  3.6 MB/sec out to stripping
         
TOTAL     9.9 MB/s in 19.8 MB/s out

LHCb_M-DST 39 T1D1 XXX MB/sec in from stripping XXX MB/sec out to tape
  8.8 MB/sec out to T1
  3.0 MB/sec out to T2
  XXX MB/sec out to analysis
         
TOTAL     XXX MB/s in XXX MB/s out

LHCb_DST 111 T0D1 11.6 MB/sec in from T1 XXX MB/sec out to analysis
  8.4 MB/sec out to T2
         
TOTAL     XXX MB/s in XXX MB/s out

LHCb_USER 15 T1D1 XXX MB/sec in from analysis XXX MB/sec out to analysis
  XXX MB/sec out to tape
         
TOTAL     XXX MB/s in XXX MB/s out

-- FlaviaDonno - 05 Feb 2007

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Topic revision: r2 - 2007-02-06 - FlaviaDonno
 
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