On Thu, 20 Nov 2008, Avi Kivity wrote:
> Thomas Mueller wrote: > > > Right now, qcow2 isn't a > > > reliable format regardless of the type of cache your using because > > > metadata is not updated in the correct order. > > > > so you don't advise to use qcow2 as a VBD or what do you mean with "isn't > > reliable"? > > > > Right, qcow2 is both very slow with cache=writethrough (or off), and may > corrupt itself if the host crashes at the wrong moment. > > > or contrawise: on the other formats the metadata is updated in the correct > > order? > > > > raw is the only format we're sure of. With that in mind I converted my qcow2 image to raw, and I'm trying to use that as a base image to create a new raw (writeable) image: #qemu-img create -b vista.raw vista.delta Formatting 'vista.delta', fmt=raw, backing_file=vista.raw, size=20971520 kB qemu-img: Formatting or formatting option not supported for file format 'raw' Doesn't that seem like a bug? Do people just not use raw images in this way? Thanks. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
