Caching in the Sprite network file system
ACM Transactions on Computer Systems (TOCS)
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SOSP '89 Proceedings of the twelfth ACM symposium on Operating systems principles
Computer architecture: a quantitative approach
Computer architecture: a quantitative approach
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Analysis of the Periodic Update Write Policy for Disk Cache
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AWOL: an adaptive write optimizations layer
FAST'08 Proceedings of the 6th USENIX Conference on File and Storage Technologies
CA-NFS: a congestion-aware network file system
FAST '09 Proccedings of the 7th conference on File and storage technologies
CA-NFS: A congestion-aware network file system
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ACM Transactions on Storage (TOS)
Membrane: operating system support for restartable file systems
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SOSP '11 Proceedings of the Twenty-Third ACM Symposium on Operating Systems Principles
Towards reliable storage systems
Towards reliable storage systems
A File Is Not a File: Understanding the I/O Behavior of Apple Desktop Applications
ACM Transactions on Computer Systems (TOCS)
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Some file systems can delay writing modified data to disk, in order to reduce disk traffic and overhead. Prudence dictates that such delays be bounded, in case the system crashes. We refer to an algorithm used to decide when to write delayed data back to disk as an update policy. Traditional UNIX® systems use a periodic update policy, writing back all delayed-write data once every 30 seconds. Periodic update is easy to implement but performs quite badly in some cases. This paper describes an approximate implementation of an interval periodic update policy, in which each individual delayed-write block is written when its age reaches a threshold. Interval periodic update adds little code to the kernel and can perform much better than periodic update. In particular, interval periodic update can avoid the huge variances in read response time caused by using periodic update with a large buffer cache.