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o2image

o2image(8)							OCFS2 Manual Pages							o2image(8)

NAME

       o2image - Copy or restore OCFS2 file system meta-data

SYNOPSIS

       o2image [-r] [-I] device image-file

DESCRIPTION

       o2image	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 improving performance.

       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) for-
       mat, in which the blocks are written to the same offset as they are on the device.

       debugfs.ocfs2 understands both formats.

       o2image	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.

OPTIONS

       -r     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.

       -I     Restores meta-data from the image-file onto the device. CAUTION: This option could corrupt the file system.

       -i     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.

EXAMPLES

       [root@node1 ~]# o2image /dev/sda1 sda1.out
       Copies metadata blocks from /dev/sda1 device to sda1.out file

       [root@node1 ~] o2image -I /dev/sda1 sda1.out
       Use with CAUTION. Copies meta-data blocks from sda1.out onto the
       /dev/sda1 device.

SEE ALSO

       debugfs.ocfs2(8) fsck.ocfs2(8)

AUTHORS

       Oracle Corporation

COPYRIGHT

       Copyright (C) 2007, 2010 Oracle. All rights reserved.

Version 1.6.4							  September 2010							o2image(8)

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