[Please follow up on libguestfs(a)redhat.com, there is no need to subscribe] On Mon, Jun 13, 2016 at 04:03:20PM +0200, Vlastimil Burián wrote: If you just want to do it with libguestfs and don't need to automate the process (ie. you're only doing it one-off for a few disks), then it's better to use virt-rescue. Something like this: $ virt-rescue -a thedisk (See also: http://www.tuxera.com/community/ntfs-3g-advanced/data-compression/) You can also use the regular getfattr command to list the attribute, although the format seems to need a bit of decoding: # file: compressed system.ntfs_attrib=0sEAgAAA== # file: uncompressed/ system.ntfs_attrib=0sEAAAAA== Unfortunately these attributes are not passed through FUSE. I suspect that is because they are in the system.* namespace which the kernel handles specially, but there are also a bunch of bugs associated with extended attributes & guestmount and maybe this is one of them. It should be possible to read and set the attributes through the API (eg. using guestfish). See the APIs guestfs_lsetxattr and guestfs_lgetxattr and related. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org