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Thursday, August 20 • 2:30pm - 3:00pm
qcow2: why (not)? - Max Reitz & Kevin Wolf

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VM users often expect the storage backend to do more than just store data, such as the ability of creating live backups. In order to use some of these features, it is necessary to use the qcow2 format for storing the VM disk data. However, qcow2 incurs a performance penalty over just storing the data as a raw file. Therefore, users always face the choice of trading features for performance. This presentation will briefly touch why there are important reasons for using qcow2, and then focus on its performance, the reasons for said penalty, and what can be done and is being done to try to overcome it.


Max Reitz

Red Hat
Max Reitz is a computer science student at TU Dresden and a Red Hat intern co-maintaining QEMU's block layer core. Together with Kevin Wolf, he has held talks at KVM Forum 2014 and 2015.

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.

Thursday August 20, 2015 2:30pm - 3:00pm
Cedar Room

Attendees (19)