[PVE-User] Backup size
gilles.mocellin at nuagelibre.org
Fri Apr 4 18:30:37 CEST 2014
Le 04/04/2014 18:12, VIDAL, Thomas (Bioversity-France) a écrit :
> I will try Diaolin solution with zero.file.
> I will let you know on monday.
> Thanks in all the cases
For information, the package zerofree handle that case better than
filing the whole filesystem with a file.
# LANG=C aptitude show zerofree
State: not installed
Maintainer: Thibaut Paumard <paumard at users.sourceforge.net>
Uncompressed Size: 14.3 k
Depends: e2fslibs (>= 1.37), libc6 (>= 2.3.4)
Description: zero free blocks from ext2, ext3 and ext4 file-systems
Zerofree finds the unallocated blocks with non-zero value content in
an ext2, ext3 or ext4 file-system and fills them with zeroes (zerofree
can also work with another value
than zero). This is mostly useful if the device on which this
file-system resides is a disk image. In this case, depending on the type
of disk image, a secondary utility may
be able to reduce the size of the disk image after zerofree has been
run. Zerofree requires the file-system to be unmounted or mounted
The usual way to achieve the same result (zeroing the unused blocks)
is to run "dd" do create a file full of zeroes that takes up the entire
free space on the drive, and then
delete this file. This has many disadvantages, which zerofree alleviates:
* it is slow;
* it makes the disk image (temporarily) grow to its maximal extent;
* it (temporarily) uses all free space on the disk, so other
concurrent write actions may fail.
Zerofree has been written to be run from GNU/Linux systems installed
as guest OSes inside a virtual machine. If this is not your case, you
almost certainly don't need this
package. (One other use case would be to erase sensitive data a little
bit more securely than with a simple "rm").
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