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Incremental Scalability
Based on storage needs and deployment schedules, HPSS scales incrementally by adding computer, network and storage resources. A single HPSS namespace can scale from petabytes of data to exabytes of data, from millions of files to billions of files, and from a few file-creates per second to thousands of file-creates per second.
About HPSS   :    HPSS Tape Library Efficiency
HPSS Tape Library Efficiency on Versions 7.5.2 and 7.5.3

HPSS versions 7.5.2 and 7.5.3 include new features that directly improve tape library mount rates across multiple tape library types. Improved tape library efficiency reduces the access latency for data on tape. In these versions, HPSS streamlines the way cartridge move requests are processed to maximize efficiency.

7.5.2 Tape Library Efficiency Improvements

Tape improvements have been made to HPSS version 7.5.2 which significantly raise the mount rate efficiency of tape libraries. SCSI PVR improvements that create this increase in efficiency include:

  • Expediting command processing by minimizing communications with the library before sending each command.
  • Further reducing individual move request overhead by minimizing waits during retries
  • Allowing a single control path to queue up to 16 commands by implementing SCSI command queuing
  • Implementing a move scheduler to interlace tape mounts and tape dismounts so the robot is always holding a tape when moving

These changes to HPSS version 7.5.2 drive HPSS efficiency with IBM TS4500 tape libraries from 78% on version 7.5.1 to 99%. The mount rate on 7.5.1 was 702 mounts per hour; it has risen to 894 mounts per hour on 7.5.2.

HPSS 7.5.2 almost doubles the mount rate efficiency with Spectra Logic Libraries from the efficiency seen on 7.5.1. Mount rate efficiency has grown from 42% to 80% on 7.5.2.* The ability to submit multiple move requests with HPSS 7.5.2 has allowed HPSS to support Spectra Logic library's capability to efficiently order multiple requests.

The following graph illustrates the increased mount rate performance with HPSS 7.5.2:

7.5.3 Tape Library Efficiency Improvements

HPSS 7.5.3 improves tape library efficiency further. These improvements include the following new features:

  • Detection of Spectra Logic library zones so that both robot arms are kept busy.
  • Detection of Spectra Logic TeraPack boundaries in the robot and grouping moves by TeraPack so that multiple cartridges can be mounted and dismounted with each TeraPack move.
The combination of these features allows HPSS 7.5.3 to drive mount rate performance to the hardware rate.

On version 7.5.3, HPSS efficiency with the IBM TS4500 has been maintained at 99% (from version 7.5.2). With Spectra Logic tape libraries, mount rate efficiency has been improved to 99% from 80% on 7.5.2.*

The following graph illustrates the mount rate performance with HPSS 7.5.3:

Future HPSS Versions

In future versions of HPSS, maintaining high mount rate efficiency is a priority. The HPSS roadmap is full of library performance improvements. The HPSS goal is to sustain 99% library efficiency with both IBM TS4500 and Spectra Logic libraries as improvements arrive.


*Please contact Spectra Logic about tape library mount rate expectations.

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Come meet with us!
HPSS @ SC18
The 2018 international conference for high performance computing, networking, storage and analysis will be in Dallas, Texas from November 11th through 15th, 2018 - Learn More. Come visit the HPSS folks at the IBM booth and contact us if you would like to meet with the IBM business and technical leaders of HPSS in Dallas.

HPSS @ MSST 2019
The 35th International Conference on Massive Storage Systems and Technology will be in Santa Clara, California in May of 2019 - Learn More. Please contact us if you would like to meet with the IBM business and technical leaders of HPSS at Santa Clara University.

HPSS @ ISC19
The 2019 international conference for high performance computing, networking, and storage will be in Frankfurt, Germany from June 16th through 20th, 2019 - Learn More. Come visit the HPSS folks at the IBM booth and contact us if you would like to meet with the IBM business and technical leaders of HPSS in Frankfurt.

2019 HUF
The 2019 HPSS User Forum details are coming soon. The HUF is typically hosted by HPSS customers in the September/October timeframe. The 2018 HUF was hosted by the UK Met Office in Exeter, United Kingdom from October 15th through October 18th, 2018.

What's New?
Best of Breed for Tape - HPSS 7.5.2 and 7.5.3 improvements raise HPSS tape library efficiency to 99% on both IBM and Spectra Logic tape libraries.

HPSS 7.5.2 Release - HPSS 7.5.2 was released in June 2018 and introduces many new and exciting improvements.

Explosive data growth - HPSS Collaboration leadership from Lawrence Berkeley National Laboratory's National Energy Research Scientific Computing Center (NERSC) helped author the "NERSC Storage 2020" report, and NERSC trusts HPSS to meet their immediate and long term data storage challenges.

HPSS Vendor Partnership Grows - HPSS begins Quantum Scalar i6000 tape library testing in 2018. Other HPSS tape vendor partners include IBM, Oracle, and Spectra Logic.

Swift On HPSS - Leverage OpenStack Swift to provide an object interface to data in HPSS. Directories of files and containers of objects can be accessed and shared across ALL interfaces with this OpenStack Swift Object Server implementation - Contact Us for more information, or Download Now.

Capacity Leader - ECMWF (European Center for Medium-Range Weather Forecasts) has a single HPSS namespace with 385 PB spanning 356 million files.

File-Count Leader - LLNL (Lawrence Livermore National Laboratory) has a single HPSS namespace with 46 PB spanning 1.208 billion files.

RAIT - Oak Ridge National Laboratory cut redundant tape cost-estimates by 75% with 4+P HPSS RAIT (tape stripe with rotating parity) and enjoy large file tape transfers beyond 1 GB/s.
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