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

[Grant McWilliams <grantmasterflash@xxxxxxxxx>]

On Sun, Jul 11, 2010 at 8:28 PM, Garrett Robinson <Garrett.Robinson@xxxxxxxxxxx> wrote:

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.

I fought with qcow and qcow2 with Xen for way too long. It seemed that no matter what version of Xen and the Linux kernel I was using there was always a bug that kept qcow from working. I eventually gave up. Rumor has it that Xen4 has working cow if you can get blktap2 to function.


Grant McWilliams

Some people, when confronted 
with a problem, think "I know, I'll use Windows." 
Now they have two 
problems.
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