Re: [Libguestfs] [PATCH v7 6/6] v2v: Add -o rhv-upload output mode (RHBZ#1557273).

On Sun, Mar 25, 2018 at 08:05:14PM +0000, Nir Soffer wrote: > When using the sdk, you can select both the image format and sparse, so you > can create invalid combinations. oVirt selects the allocation for you. > > storage type image format sparse | allocation creating > -----------------------------------|-------------------------------------------------------- > file qcow2 true | thin sparse file of image > size bytes > file raw false | preallocated preallocated file of > provisioned_size bytes > file raw true | thin sparse file of > provisioned_size > bytes > file qcow2 false | - unsupported > block qcow2 true | thin logical volume of > initial_size bytes > block raw false | preallocated logical volume of > provisioned_size bytes > block qcow2 false | - unsupported > block raw true | - unsupported > > The only case when selecting the sparse value is useful is raw file > on file based storage domain, allowing creation of sparse or preallocated > disk. I don't think this is true. Both LVs (lvmthin) and SAN LUNs can support sparse allocation meaningfully.