As has already been mentioned, some commands (or command options) are only supported on later releases, the man pages don't say this. Does anyone know of a source of information listing the command, option and version it is implemented in? That alone would be a great help. ----- Original Message ----- From: "Chris Adams" <linux at cmadams.net> To: "centos" <centos at centos.org> Sent: Monday, July 31, 2017 11:45:20 AM Subject: Re: [CentOS] claiming unsused space back Once upon a time, Warren Young <warren at etr-usa.com> said: > Zeroing the free space not only prevents inclusion of these discarded FS blocks, they compress better, too. Check out the "virt-sparsify" command - it does all of this for you. -- Chris Adams <linux at cmadams.net> _______________________________________________ CentOS mailing list CentOS at centos.org https://lists.centos.org/mailman/listinfo/centos