Ral tape system
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RAL Tape system. Setup. SL8500 tape library, 10K slots for T1 18 T10KA 9 T10KB 14 T10KC SL8500 Tape library, 10K slots for facilities 3 9940B 16 T10KA 10 T10KB 10 T10KC. Repack . Single head node running all repack “bits” 4 DEL R510 12 bay disk servers as disk cache

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Setup
Setup

  • SL8500 tape library, 10K slots for T1

    • 18 T10KA

    • 9 T10KB

    • 14 T10KC

  • SL8500 Tape library, 10K slots for facilities

    • 3 9940B

    • 16 T10KA

    • 10 T10KB

    • 10 T10KC


Repack
Repack

  • Single head node running all repack “bits”

  • 4 DEL R510 12 bay disk servers as disk cache

    • 900GB 10K SAS drive, 23GB memory

    • Raid6

  • Part of 10Gb network

  • Tape drives dedicated as required

  • Running 2.1.12-10


Repack lhcb
Repack - LHCb

  • Used to migrate all of LHCb’s data

    • 2334 A tapes

    • ~1PB data

  • Took about 1 month

  • Only one tape found with errors, 4 files lost


Repack performance
Repack - performance

  • Graph shows network for the 4 disk servers during repacking


Repack performance1
Repack - Performance

  • This shows performance for write to one of the C tape drives


Other
Other

  • Repack

    • Will our setup scale to cope with D drives?

  • Support for D drives

  • Any CDK development now Oracle have “new” version.


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