Coerced Cache Eviction and discreet mode journaling: Dealing with misbehaving disks

Authors:
Abhishek Rajimwale;Vijay Chidambaram;Deepak Ramamurthi;Andrea C. Arpaci-Dusseau;Remzi H. Arpaci-Dusseau
Affiliations:
Data Domain, Inc., Computer Sciences Department, University of Wisconsin-Madison, USA;-;-;-;-
Venue:
DSN '11 Proceedings of the 2011 IEEE/IFIP 41st International Conference on Dependable Systems&Networks
Year:
2011

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Consistency without ordering

FAST'12 Proceedings of the 10th USENIX conference on File and Storage Technologies

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Abstract

We present Coerced Cache Eviction (CCE), a new method to force writes to disk in the presence of a disk cache that does not properly obey write-cache configuration or flush requests. We demonstrate the utility of CCE by building a new journaling mode within the Linux ext3 file system. When mounted in this discreet mode, ext3 uses CCEs to ensure that writes are properly ordered and thus maintains file system integrity despite the presence of an improperly behaving disk. We show that discreet mode journaling operates with acceptable overheads for most workloads.