Tape Libraries (Automated Cartridge Systems)

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Copyright - FZ Jülich

Tape libraries are the most cost-efficient technology in terms of TCO and capacity, but with the drawback of a very high latency. It’s designation is to store cold data, which will be read very seldom or may be never.

We use it in our storage hierarchy for three central services.

  • Backup and Restore of data

  • Long term archival of data

  • Migration of active (online) data to less expensive storage media
    • User data in the GPFS archive file systems of the HPC-systems are automatically migrated to tape by the HSM (Hierarchical Storage Manager) component of TSM (Tivoli Storage Manager). The selection criteria for the migration are age and size of a file. The user data will be recalled automatically and transparently for the user when they are accessed.

    • Project related data in the dCache-System are automatically migrated to tape by the TSM-HSM API interface of the Pool servers. The data will be recalled automatically and transparently for the user when they are accessed.

Users of the HPC systems, workstations and PCs have access to their data (Backup, Archive, Migration) in the libraries during 24 hours a day and 7 days a week.

Total Numbers

Actual capacity

~ 309 PB

Maximum capacity (theoretical)

~ 320 PB (LTO8 + T10KD)

Tapes

~ 34.700

Tape drives

78

Libraries

3 (at 2 different locations in JSC)

Hardware Characteristics of the Tape Libraries Complex

  • 1 STK Streamline SL8500
    • Actual capacity: ~ 50 PB
      • 5800 cartridges T10000T2, each 8 - 8.5 TB with T10000D

    • Tape Slots: 6600

    • Tape drives: 20
      • 20 x T10000D

    • Transfer rate:
      • T10000D: up to 240 MB/sec

  • 1 STK Streamline SL8500
    • Actual capacity: ~ 85 PB
      • 6800 cartridges T10000T2, each 8 - 8.5 TB with T10000D

      • 2000 cartridges LTO7M8, each 9 TB (LTO8)

      • 800 cartridges LTO8, each 12 TB

    • Tape Slots: 10000

    • Tape drives: 38
      • 20 x T10000D

      • 18 x LTO8

    • Transfer rate:
      • T10000D: up to 240 MB/sec

      • LTO8: up to 300 MB/sec

  • 1 TS 4500
    • Actual capacity: ~ 174 PB
      • 19372 cartridges LTO7M8, each 9 TB with LTO8

    • Tape Slots: 21386

    • Tape drives: 20
      • 20 x LTO8

    • Transfer rate:
      • LTO8: up to 300 MB/sec