I am using 7za to prepare backup for a VM directory hosted on VMWare ESXi hypervisor. In order to freeze the xx-flat.vmdk, I created a snapshot, this should technically allow reads on this file. But when we try to prepare archive with compression selected as "-mx=1", it fails with error E_FAIL.
Whereas, if the same experiment is repeated with "-mx=0", it succeeds.
Please provide your comments on this.