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Effect of Error-Correction Coding Schemes on Maximum Throughput of Automated Tape Systems

Authors:
Ilias Iliadis

Keywords: Performance analysis; Reliability; MTTDL; EAFEDL; MDS codes; Unrecoverable or latent sector errors; stochastic modeling.

Abstract:
Tape is a highly scalable and reliable media, which enables long-term access of stored data. Tape's low energy consumption combined with the low cost per terabyte make it an appealing option for storing infrequently accessed data. Power and operational failures may damage tapes and lead to data loss. To protect stored data against loss, erasure-coding redundancy schemes are employed. Performance is affected by the size and operational characteristics of the tape libraries, the mount and unmount policies employed, the request servicing policy adopted, the erasure coding configurations implemented, and the characteristics of the workload considered. In this article, we develop a theoretical model that takes into account the principal operational aspects of a tape library system and derives its maximum throughput. It is demonstrated that employing erasure coding may adversely affect the maximum throughput. It is also established that the maximum throughput improves when requests are served according to schemes that effectively reduce seek times. The model provides useful insights into the effect of various system configurations and yields results that enable a better understanding of the design tradeoffs between reliability and system processing capability reflected by the maximum throughput.

Pages: 1 to 11

Copyright: Copyright (c) IARIA, 2025

Publication date: May 18, 2025

Published in: conference

ISSN: 2308-4022

ISBN: 978-1-68558-281-4

Location: Nice, France

Dates: from May 18, 2025 to May 22, 2025