Provided by: ocfs2-tools_1.8.7-1build1_amd64 bug


       tunefs.ocfs2 - Change OCFS2 file system parameters.


       tunefs.ocfs2  [--cloned-volume[=new-label]  [--fs-features=list-of-features]  [-J journal-
       options]  [-L  volume-label]  [-N  number-of-node-slots]  [-Q  query-format]  [-ipqnSUvVy]
       [--backup-super] [--list-sparse] device  [blocks-count]


       tunefs.ocfs2(8)  is used to adjust OCFS2 file system parameters on disk.  The tool expects
       the cluster to be online as it needs to take the appropriate cluster locks to write safely
       to disk.


              Change  the  volume  UUID  (auto-generated) and the label, if provided, of a cloned
              OCFS2 volume.  This option does not perform volume cloning.  It  only  changes  the
              UUID  and  label  on a cloned volume so that it can be mounted on the node that has
              the original volume mounted.

              Turn specific file system features on  or  off.  tunefs.ocfs2(8)  will  attempt  to
              enable or disable the feature list provided. To enable a feature, include it in the
              list. To disable a feature, prepend no to the name. For a list  of  feature  names,
              refer to mkfs.ocfs2(8).

       -J, --journal-options options
              Modify the journal using options specified on the command-line. Journal options are
              comma separated, and may take an argument using the equals ('=') sign. For  a  list
              of possible options, refer to mkfs.ocfs2(8).

       -L, --label volume-label
              Change the volume label of the file system. Limit the label to under 64 bytes.

       -N, --node-slots number-of-node-slots
              Valid  number  ranges  from  1  to 255. This number specifies the maximum number of
              nodes that can concurrently mount the partition. Use this to increase  or  decrease
              the  number  of  node  slots.  One reason to decrease could be to release the space
              consumed by the journals for those slots.

       -S, --volume-size
              Grow the size  of  the  OCFS2  file  system.  If  blocks-count  is  not  specified,
              tunefs.ocfs2(8) extends the volume to the current size of the device.

       -Q, --query query-format
              Query the file system for its attributes like block size, label, etc. Query formats
              are modified versions of the standard printf(3) formatting. The format is  made  up
              of  static  strings  (which  may include standard C character escapes for newlines,
              tabs, and other special characters) and printf(3) type formatters. The list of type
              specifiers is as follows:

                   B    Block size in bytes

                   T    Cluster size in bytes

                   N    Number of node slots

                   R    Root directory block number

                   Y    System directory block number

                   P    First cluster group block number

                   V    Volume label

                   U    Volume uuid

                   M    Compat flags

                   H    Incompat flags

                   O    RO Compat flags

       -q, --quiet
              Quiet mode.

       -U, --uuid-reset[=new-uuid]
              Reset  the  volume  UUID of the file system. If not provided, the utility will auto
              generate   it.    For    custom    UUID,    specify    in    either    the    plain
              (2A4D1C581FAA42A1A41D26EFC90C1315)           or           the           traditional
              (2a4d1c58-1faa-42a1-a41d-26efc90c1315) format. Users specifying custom  UUIDs  must
              be  careful to ensure that no two volumes have the same UUID. If more than one file
              system were to have the  same  UUID,  one  is  very  likely  to  encounter  erratic
              behavior, if not, outright file system corruption.

       -v, --verbose
              Verbose mode.

       -V, --version
              Show version and exit.

       -y, --yes
              Always answer Yes in interactive command line.

       -n, --no
              Always answer No in interactive command line.

              Backs  up  the superblock to fixed offsets (1G, 4G, 16G, 64G, 256G and 1T) on disk.
              This option is useful for users to backup the superblock on volumes that  the  user
              either  explicitly disallowed while formatting, or, used a version of mkfs.ocfs2(8)
              (1.2.2 or older) that did not provide this facility.

              Lists the files having holes. This option  is  useful  when  disabling  the  sparse

              Updating on-disk cluster information to match the running cluster. Users looking to
              update the on-disk cluster stack without starting the new cluster  should  use  the
              o2cluster(8) utility.

              During  resize,  tunefs.ocfs2(8)  automatically  determines  the  size of the given
              device and grows the file system such that it uses all of the  available  space  on
              the  device.  This  optional  argument  specifies  that  the  file system should be
              extended to consume only the given number of file system blocks on the device.


       # tunefs.ocfs2 -Q "UUID = %U\nNumSlots = %N\n" /dev/sda1
       UUID = CBB8D5E0C169497C8B52A0FD555C7A3E
       NumSlots = 4


       debugfs.ocfs2(8)   fsck.ocfs2(8)   fsck.ocfs2.checks(8)    mkfs.ocfs2(8)    mount.ocfs2(8)
       mounted.ocfs2(8) o2cluster(8) o2image(8) o2info(1)


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