[2015] qcow2: why (not)? by Max Reitz and Kevin Wolf





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Published on Aug 27, 2015

Full backups of large storage devices are expensive, slow, and waste a lot of space needlessly by copying sectors that have not changed over and over again. Incremental and differential backups are an oft requested feature in QEMU, and will help eliminate the redundant copying of backup data. This presentation will cover recent developments in related delta-backup technologies, covering incremental and differential backups, image fleecing, and dirty bitmap management. We will highlight how these features are accomplished using modifications to existing QMP primitives such as the 'drive-backup' and 'transaction' commands to unlock rich functionality within our existing APIs.

Max Reitz
Red Hat

Max Reitz is a computer science student at TU Dresden and has been working on QEMU's block layer as a Red Hat intern since 2013. Together with Kevin Wolf, he held a presentation on block device configuration at KVM Forum 2014.

Kevin Wolf
KVM Developer, Red Hat

Kevin Wolf works at Red Hat as a KVM developer, with a focus on block devices. He is the maintainer of QEMU's block subsystem and has contributed many patches to block device emulation and image for drivers. After graduating in Software Engineering at the University of | Stuttgart, Germany in 2008 he worked on Xen's block layer for a year before he started working on KVM for Red Hat in 2009.


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