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Okeanos: Wasteless Journaling for Fast and Reliable Multistream Storage Andromachi Hatzieleftheriou and Stergios V. Anastasiadis
 

Summary: Okeanos: Wasteless Journaling for Fast and Reliable Multistream Storage
Andromachi Hatzieleftheriou and Stergios V. Anastasiadis
Department of Computer Science
University of Ioannina, Greece
Abstract
Synchronous small writes play a critical role in the re-
liability and availability of file systems and applications
that use them to safely log recent state modifications and
quickly recover from failures. However, storage stacks
usually enforce page-sized granularity in their data trans-
fers from memory to disk. We experimentally show that
subpage writes may lead to storage bandwidth waste and
high disk latencies. To address the issue in a journaled
file system, we propose wasteless journaling as a mount
mode that coalesces synchronous concurrentsmall writes
of data into full page-sized blocks before transferring
them to the journal. Additionally, we propose selective
journaling that automatically applies wasteless journal-
ing on data writes whose size lies below a fixed precon-
figured threshold. In the Okeanos prototype implemen-

  

Source: Anastasiadis, Stergios V. - Department of Computer Science, University of Ioannina

 

Collections: Computer Technologies and Information Sciences