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QED: A New, High Performance QEMU Disk Format

Virtualization

Published on 06 July 2011 07:25 PM EDT
Written by Michael Larabel in Virtualization
5 Comments

Linux-KVM mentions QED, the new QEMU Enhanced Disk format. This new disk format for QEMU/KVM is designed to be much faster than QCOW2 and other existing disk formats available to virtualization users.

The request for comments on QED went out last September and the QEMU Enhanced Disk format can already be found within the QEMU 0.14 release. This new format tries to be superior to QCOW2 and others. Current features include fully a-synchronous I/O path, strong data integrity, backing files, and sparse files.

Being worked on QED for the future is image streaming, online defragmentation, TRIM support, parallel submission, and meta-data scan avoidance.

Additional details on the QED disk format can be found on the QEMU Wiki.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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