[Xen-users] Support for file-based COW, present and future

[Garrett Robinson <Garrett.Robinson@xxxxxxxxxxx>]

I am currently working on a project that would be well-served by a file-based COW filesystem such as is theoretically offered by QCOW, according to both "Running Xen" and "The Book of Xen." Both books refer the reader to the internet for details on such an implementation.

All I have been able to find so far is the COW section on the Xen wiki, which hasn't been updated in three years, and various blog posts. Searching the xen-users archives only further diminished my hopes, as it seems like there are numerous bugs with the qcow implementation in Xen, and that the current unstable release of Xen is the only one with support in the first place.

I know people on this forum are busy and that this is the somewhat general question of a newbie. What I'm really wondering is this: Has anybody has success with implementing COW filesystems for their Xen guests using any system, but in particular a file-based one? And does anybody know the present status or future of COW/QCOW implementation in Xen?

Your time is greatly appreciated,
Best,
-Garrett Robinson.
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