Hi, As is well known, qcow2 files contain a large number of reference counted clusters that correspond roughly to file system blocks.
As snapshots are deleted, many clusters will become logically freed (they are no longer referenced by any image or snapshot). My main question is how to remove, or at least zero out, those unused host clusters, assuming the qcow2 file is not busy (because the virtual machine is stopped and the virtual disk is not being accessed with any other tool)? My secondary question is why the qcow2 specification (qcow2.txt) is not installed with the other documentation files, and why there is no corresponding web page (not even in the qemu Wiki)? Enjoy Jakob -- Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10 This public discussion message is non-binding and may contain errors. WiseMo - Remote Service Management for PCs, Phones and Embedded
