xenial (1) o2info.1.gz

Provided by: ocfs2-tools_1.6.4-3.1_amd64 bug

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  practice,  '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 © 2010 Oracle. All rights reserved.