Am 02.05.2013 13:05, schrieb Alexandre DERUMIER:
>>> I also read that we'll loose sparseness with qemu-img as it does raw
>
>>> export and import.
>
> I'm not sure about it, qemu-img code is
>
>
> if (has_zero_init) {
> /* If the output image is being created as a copy on write
> image,
> assume that sectors which are unallocated in the input
> image
> are present in both the output's and input's base images
> (no
> need to copy them). */
> if (out_baseimg) {
> if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset,
> n, &n1)) {
> sector_num += n1;
> continue;
> }
> /* The next 'n1' sectors are allocated in the input
> image. Copy
> only those as they may be followed by unallocated
> sectors. */
> n = n1;
> }
> } else {
> n1 = n;
> }
Yes but with rbd export everything is allocated to 0.
Stefan
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