tunefs.ocfs2 - Change OCFS2 file system parameters.
[--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 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 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, see the man
page for mkfs.ocfs2.
-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, see
the man page for mkfs.ocfs2.
-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.
Grow the size of the OCFS2 file system. If blocks-count is not
specified, tunefs.ocfs2 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
Change the volume UUID (auto-generated) for the file system.
Show version and exit.
Always answer Yes in interactive command line.
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 (1.2.2 or
older) that did not provide this facility.
Lists the files having holes. This option is useful when
disabling the sparse feature.
Updating on-disk cluster information to match the running
During resize, tunefs.ocfs2 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.
[root@node1 ~]# tunefs.ocfs2 -Q "UUID = %U\nNumSlots = %N\n" /dev/sda1
UUID = CBB8D5E0C169497C8B52A0FD555C7A3E
NumSlots = 4
mkfs.ocfs2(8) fsck.ocfs2(8) debugfs.ocfs2(8) mounted.ocfs2(8)
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