The ADvanced Systems Laboratory (ADSL)
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Zettabyte Reliability with Flexible End-to-end Data Integrity
Yupu Zhang,
Daniel S. Myers,
Andrea C. Arpaci-Dusseau,
Remzi H. Arpaci-Dusseau
Department of Computer Sciences,
University of Wisconsin-Madison
Abstract:
We introduce flexible end-to-end data integrity for storage systems, which
enables each component along the I/O path (e.g., memory, disk) to alter its
protection scheme to meet the performance and reliability demands of the
system. We apply this new concept to Zettabyte File System (ZFS) and build
Zettabyte-Reliable ZFS (Z2FS). Z2FS provides dynamical tradeoffs between
performance and protection and offers Zettabyte Reliability, which is one
undetected corruption per Zettabyte of data read. We develop an
analytical framework to evaluate reliability; the protection
approaches in Z2FS are built upon the foundations of the framework. For
comparison, we implement a straight-forward End-to-End ZFS (E2ZFS) with the same
protection scheme for all components. Through analysis and experiment, we show
that Z2FS is able to achieve better overall performance than E2ZFS, while
still offering Zettabyte Reliability.
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