On 08/28/2010 06:22 AM, Patrick O'Callaghan wrote: > On Fri, 2010-08-27 at 21:53 -0700, JD wrote: >> On 08/27/2010 09:25 PM, JD wrote: >>> Is there a Linux util to scrub free disk blocks and keep everything >>> else intact ?? >>> >> Someone (not on this list) described a simple way to do this. >> Scrubbing files to be deleted is easy enough - there are utils for it >> already. >> But scrubbing existing free space is slower and requires patience. >> >> cd to the root of the partition. >> sudo dd if=/dev/zero of=ZERO bs=20M >> >> When the dd program fails to write any further, you >> have grabbed and zeroed all available free disk blocks >> in the partition. >> >> Now all you do is use the command scrub to scrub the file ZERO >> and when done the file is deleted. > From scrub(1): > > -X, --freespace > Create specified directory and fill it with files until write returns ENOSPC (file system full), > then scrub the files as usual. The size of each file can be set with -s, otherwise it will be the > maximum file size creatable given the user’s file size limit or 1g if umlimited. > > However note that neither of these methods guarantees to scrub indirect > blocks in the filesystem that were used to create the space-filling > files. Maybe they do, maybe they don't, it's not clear. > > poc > What is not clear from the man page is, when using the -X option, whether or not the directory and the files created in the directory are automatically deleted before scrub exits. I will assume that they are. Currently scrubbing 189GB free space. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
