On 08/08/2013 12:34, Ralf Ramsauer wrote: > Hi, > > QCOW2 uses a similar idea like file holes (sparse files) on filesystems [1]. > RAW Images also may use file holes. > > If qemu would support TRIM, then the guest could easily discard and zero > all unused blocks. > The host system could detect all unused blocks in a (e.g.) qcow2 image > and shrink it down to its minimum size. > > Did anyone already think about that? >
Yes but no time to implement. I believe VirtualBox has some support for TRIM already btw. François.
