Eventually we'll probably want to support multiple versions, replacing one or both of the formats with variables, but even then we'll probably just want to copy if source format == destination format.
On Wed, Dec 5, 2012 at 1:51 PM, Rohit Yadav <rohit.ya...@citrix.com> wrote: > > On 05-Dec-2012, at 12:17 PM, Marcus Sorensen <shadow...@gmail.com> wrote: > > > Anyone know why we do a convert from qcow2 to qcow2 when we crete a > volume > > or template? It seems slower than file copy, and it strips valuable > > compression which could speed up deployments significantly. Our qcow2 > > templates are compressed to about 1/3 size of uncompressed, and since the > > compression is read-only it doesn't really affect future write > performance, > > and gives a slight performance gain to reads since less is read. > > > > createvolume.sh > > qemu_img convert -f qcow2 -O qcow2 > > > > managesnapshot.sh > > qemu_img convert -f qcow2 -O qcow2 > > > > createtmplt.sh > > qemu_img convert -f qcow2 -O qcow2 > > > > I'd suggest if we already know it's qcow2, and we want to create a qcow2 > to > > copy the file. Objections? > > > I don't know why we do that, but what the command is saying is that we > want to convert an input image from qcow2 to keeping the same output > format, -O qcow2 > But yes, if the input format is already qcow2 and output is qcow2 we can > just copy the file. Edison? > > Regards.
