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Integrated System and Process Crash Recovery in the Loris Storage Stack

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3 Author(s)
van Moolenbroek, D.C. ; Dept. of Comput. Sci., Vrije Univ., Amsterdam, Netherlands ; Appuswamy, R. ; Tanenbaum, A.S.

In this paper, we look at two important failure classes in the storage stack: system crashes, where the whole system shuts down unexpectedly, and process crashes, where a part of the storage stack software fails due to an implementation bug. We investigate these two problems in the context of the Loris storage stack. We show how restoring metadata consistency can provide a common first step for recovery from both types of crashes. In addition, we present fine-grained and corruption-resistant data resynchronization as the second step for system crash recovery, and an in-memory roll-forward log that can provide strong guarantees as the second step for process crash recovery in a microkernel setting. We implement our findings in our Loris prototype, and implement a new crash-resistant on-device layout as part of our proof of concept. The evaluation shows that our approach provides increased reliability at a reasonable performance cost.

Published in:

Networking, Architecture and Storage (NAS), 2012 IEEE 7th International Conference on

Date of Conference:

28-30 June 2012

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