jfs_tune [options] device
jfs_tune adjusts tunable parameters on a Linux JFS file system or
external journal. jfs_tune must be run as root.
device is the special file name corresponding to the actual device
(e.g. /dev/hdb1) on which a JFS file system or JFS external journal has
Attach the JFS external journal located on external-journal to
the JFS file system on device.
The external journal must already have been created using the
command. More than one file system may share the same external
mkfs.jfs -J journal_dev external-journal
Attach the external journal to the file system by using the com-
jfs_tune -J device=external-journal device
Instead of specifying a device name directly, external-journal
can also be specified by either LABEL=label or UUID=UUID (Use
jfs_tune -l device to display a journal device's volume label
-l List the contents of the JFS file system or external journal
superblock that resides on device.
Set the volume label of the JFS file system or external journal.
JFS labels can be at most 16 characters long; if volume-label is
longer than 16 characters, jfs_tune will truncate it and print a
warning. The volume label can be used by mount(8), fsck(8), and
/etc/fstab(5) (and possibly others) by specifying LABEL=vol-
ume_label instead of a block special device name like /dev/hda5.
Set the universally unique identifier (UUID) of the file system
or external journal device to UUID. The format of the UUID is a
special device name like /dev/hda1.
See uuidgen(8) for more information.
-V Print version information and exit (regardless of any other cho-
Set a randomly-generated UUID for the JFS file system on the 3rd parti-
tion of the 2nd hard disk, and view the resultant superblock:
jfs_tune -l -U random /dev/hdb3
Attach an already existing external journal on a device labeled JFSLog
to a JFS file system on /dev/hda8:
jfs_tune -J device=LABEL=JFSLog /dev/hda8
If you find a bug in JFS or jfs_tune, please report it via the bug
tracking system ("Report Bugs" section) of the JFS project web site:
Please send as much pertinent information as possible including any
error messages resulting from running jfs_tune.
jfs_fsck(8), jfs_mkfs(8), jfs_fscklog(8), jfs_logdump(8),
Barry Arndt (firstname.lastname@example.org)
jfs_tune is maintained by IBM.
See the JFS project web site for more details:
October 28, 2002 jfs_tune(8)
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