o2image - Copy or restore OCFS2
file system meta-data
] device image-file
copies the OCFS2
file system meta-data from the device to
the specified image-file. This image file contains the file system skeleton
that includes the inodes, directory names and file names. It does not
include any file data.
This image file can be useful to debug certain problems that are not
reproducible otherwise. Like on-disk corruptions. It could also be used to
analyse the file system layout in an aging file system with an eye towards
As the image-file contains a copy of all the meta-data blocks, it can be a large
file. By default, it is created in a packed format, in which all meta-data
blocks are written back-to-back. With the -r
option, the user could
choose to have the file in the raw (or sparse) format, in which the blocks are
written to the same offset as they are on the device.
understands both formats.
also has the option, -I
, to restore the meta-data from the
image file onto the device. This option will rarely be useful to end-users and
has been written specifically for developers and testers.
- Copies the meta-data to the image-file in the raw format.
Use this option only if the destination file system supports sparse files.
If unsure, do not use this option and let the tool create the image-file
in the packed format.
- Restores meta-data from the image-file onto the device.
CAUTION: This option could corrupt the file system.
- Interactive mode - before writing out the image file print
it's size and ask whether to proceed. This setting only applies when '-I'
is not specified. It can be useful when the file system holding the image
is low on disk space and the user might need to free up space once the
target image size is calculated.
Copies metadata blocks from /dev/sda1 device to sda1.out file.
# o2image /dev/sda1 sda1.out
Copies meta-data blocks from sda1.out onto the /dev/sda1 device. As this
command over-writes an existing volume, please use with CAUTION
# o2image -I /dev/sda1 sda1.out
debugfs.ocfs2(8) fsck.ocfs2(8) fsck.ocfs2.checks(8)
mkfs.ocfs2(8) mount.ocfs2(8) mounted.ocfs2(8)
o2cluster(8) o2info(1) tunefs.ocfs2(8)
Copyright © 2007, 2012 Oracle. All rights reserved.