o2info(1) [debian man page]
o2info(1) OCFS2 Manual Pages o2info(1) NAME
o2info - Dump OCFS2 file system information on disk. SYNOPSIS
o2info [-C|--cluster-coherent] [--fs-features] [--volinfo] [--mkfs] <device or file> DESCRIPTION
o2info is designed to be an information tool, to display OCFS2 file system information on disk. Its main goal on one hand, is to provide a tool to display fs info in a comprehensive way and providing the information which may be missing in debugfs.ocfs and tunefs.ocfs2 such as global bitmap free space fragmentation and free inode info for each slot, on the other hand, it also aims to become a info tool(not an administration one), which therefore allows all users who may have no read privilege on the underlying device to use the utility. In prac- tice, 'o2info /path/to/file/on/ocfs2/vol' use a new OCFS2_IOC_INFO ioctl to get info from fs for a mounted case. For a privileged user(e.g, root), the same info however, can also be accessed by 'o2info /dev/sdxN' to direcly manipulate the raw device. OPTIONS
-C, --cluster-coherent Enable cluster (in)coherency for mounted case, means it will attempt to acquire a global PR lock when querying info from a cluster filesystem, which may degrade the performance, default is none cluster-coherency. --fs-features List all compat, incompat and ro-compat fs features on OCFS2 filesystem. --volinfo Dump basic volume information, such as blocksize, clustersize, volume label and UUID etc. --mkfs Dump an original format of mkfs.ocfs's arguments, importantly, which can be used directly as a fresh mkfs retry: #mkfs.ocfs2 "$(o2info --mkfs /dev/name/or/path/of/file)" /dev/sdaX -V, --version Show version and exit. -h, --help Display help and exit. EXAMPLES
[oracle@node1 ~]# o2info --volinfo /storage/testfile # For none-privileged users. [root@node1 ~]# o2info --volinfo /dev/sda1 Label: ocfs2-volume UUID: 976D8E630B3A4F1F95497311A92901FC Block Size: 4096 Cluster Size: 4096 Node Slots: 4 Features: backup-super strict-journal-super sparse inline-data xattr Features: unwritten SEE ALSO
debugfs.ocfs2(8) tunefs.ocfs2(8) AUTHORS
Oracle Corporation COPYRIGHT
Copyright (C) 2010 Oracle. All rights reserved. Version 1.6.4 October 2010 o2info(1)
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fsck.ocfs2(8) OCFS2 Manual Pages fsck.ocfs2(8) NAME
fsck.ocfs2 - Check an OCFS2 file system. SYNOPSIS
fsck.ocfs2 [ -fFGnuvVy ] [ -b superblock block ] [ -B block size ] device DESCRIPTION
fsck.ocfs2 is used to check an OCFS2 file system. device is the file where the file system is stored (e.g. /dev/sda1). It will almost always be a device file but a regular file will work as well. OPTIONS
-b superblock block Normally, fsck.ocfs2 will read the superblock from the first block of the device. This option specifies an alternate block that the superblock should be read from. (Use -r instead of this option.) -B blocksize The block size, specified in bytes, can range from 512 to 4096. A value of 0, the default, is used to indicate that the blocksize should be automatically detected. -D Optimize directories in filesystem. This option causes fsck.ocfs2 to coalesce the directory entries in order to improve the filesys- tem performance. -f Force checking even if the file system is clean. -F By default fsck.ocfs2 will check with the cluster services to ensure that the volume is not in-use (mounted) on any node in the cluster before proceeding. -F skips this check and should only be used when it can be guaranteed that the volume is not mounted on any node in the cluster. WARNING: If the cluster check is disabled and the volume is mounted on one or more nodes, file system cor- ruption is very likely. If unsure, do not use this option. -G Usually fsck.ocfs2 will silently assume inodes whose generation number does not match the generation number of the super block are unused inodes. This option causes fsck.ocfs2 to ask the user if these inodes should in fact be marked unused. -n Give the 'no' answer to all questions that fsck will ask. This guarantees that the file system will not be modified and the device will be opened read-only. The output of fsck.ocfs2 with this option can be redirected to produce a record of a file system's faults. -r backup-number mkfs.ocfs2 makes upto 6 backup copies of the superblock at offsets 1G, 4G, 16G, 64G, 256G and 1T depending on the size of the vol- ume. Use this option to specify the backup, 1 thru 6, to use to recover the superblock. -y Give the 'yes' answer to all questions that fsck will ask. This will repair all faults that fsck.ocfs2 finds but will not give the operator a chance to intervene if fsck.ocfs2 decides that it wants to drastically repair the file system. -v This option causes fsck.ocfs2 to produce a very large amount of debugging output. -V Print version information and exit. EXIT CODE
The exit code returned by fsck.ocfs2 is the sum of the following conditions: 0 - No errors 1 - File system errors corrected 2 - File system errors corrected, system should be rebooted 4 - File system errors left uncorrected 8 - Operational error 16 - Usage or syntax error 32 - fsck.ocfs2 canceled by user request 128 - Shared library error SEE ALSO
mkfs.ocfs2(8) debugfs.ocfs2(8) tunefs.ocfs2(8) mounted.ocfs2(8) ocfs2console(8) o2cb(7) AUTHORS
Oracle Corporation. This man page entry derives some text, especially the exit code summary, from e2fsck(8) by Theodore Y. Ts'o <tytso@mit.edu>. COPYRIGHT
Copyright (C) 2004, 2010 Oracle. All rights reserved. Version 1.4.3 February 2010 fsck.ocfs2(8)