QED: A New, High Performance QEMU Disk Format
Written by Michael Larabel in Virtualization on 6 July 2011 at 07:25 PM EDT. 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.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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