1o2image(8)                    OCFS2 Manual Pages                    o2image(8)
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NAME

6       o2image - Copy or restore OCFS2 file system meta-data
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SYNOPSIS

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

12       o2image  copies  the OCFS2 file system meta-data from the device to the
13       specified image-file.  This image file contains the file system  skele‐
14       ton  that  includes the inodes, directory names and file names. It does
15       not include any file data.
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17       This image file can be useful to debug certain problems  that  are  not
18       reproducible  otherwise.   Like  on-disk  corruptions. It could also be
19       used to analyse the file system layout in an aging file system with  an
20       eye towards improving performance.
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22       As  the  image-file contains a copy of all the meta-data blocks, it can
23       be a large file.  By default, it is created  in  a  packed  format,  in
24       which  all  meta-data  blocks  are  written  back-to-back.  With the -r
25       option, the user could choose to have the file in the raw  (or  sparse)
26       format,  in which the blocks are written to the same offset as they are
27       on the device.
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29       debugfs.ocfs2 understands both formats.
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31       o2image also has the option, -I, to  restore  the  meta-data  from  the
32       image  file  onto the device. This option will rarely be useful to end-
33       users and has been written specifically for developers and testers.
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OPTIONS

37       -r     Copies the meta-data to the image-file in the  raw  format.  Use
38              this  option only if the destination file system supports sparse
39              files. If unsure, do not use this option and let the tool create
40              the image-file in the packed format.
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43       -I     Restores meta-data from the image-file onto the device. CAUTION:
44              This option could corrupt the file system.
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EXAMPLES

48       [root@node1 ~]# o2image /dev/sda1 sda1.out
49       Copies metadata blocks from /dev/sda1 device to sda1.out file
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51       [root@node1 ~] o2image -I /dev/sda1 sda1.out
52       Use with CAUTION. Copies meta-data blocks from sda1.out onto the /dev/sda1 device.
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SEE ALSO

56       debugfs.ocfs2(8) fsck.ocfs2(8)
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AUTHORS

60       Oracle Corporation
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64       Copyright © 2007, 2009 Oracle. All rights reserved.
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68Version 1.4.3                     April 2009                        o2image(8)
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