jfs_tune man page on ElementaryOS

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jfs_tune(8)		Set JFS file system parameters.		   jfs_tune(8)

NAME
       jfs_tune - adjust tunable file system parameters on JFS

SYNOPSIS
       jfs_tune [options] device

DESCRIPTION
       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
       been created.

OPTIONS
       -J device=external-journal
	      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
	      journal.

	      mkfs.jfs -J journal_dev external-journal

	      Attach the external journal to the file system by using the com‐
	      mand

	      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
	      and UUID.)

       -l     List  the	 contents  of  the JFS file system or external journal
	      superblock that resides on device.

       -L volume-label
	      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.

       -U UUID
	      Set  the universally unique identifier (UUID) of the file system
	      or external journal device to UUID.  The format of the UUID is a
	      series   of   hex	  digits  separated  by	 hyphens,  like	 this:
	      "c1b9d5a2-f162-11cf-9ece-0020afc76f16".  The UUID parameter  may
	      also be one of the following:

		   clear  clear the file system UUID

		   random generate a new randomly-generated UUID

		   time	  generate a new time-based UUID

	      The  UUID	 may  be  used by mount(8), fsck(8), and /etc/fstab(5)
	      (and possibly others) by specifying UUID=uuid instead of a block
	      special device name like /dev/hda1.

	      See uuidgen(8) for more information.

       -V     Print version information and exit (regardless of any other cho‐
	      sen options).

EXAMPLES
       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

REPORTING BUGS
       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:
       http://jfs.sourceforge.net/

       Please  send  as	 much  pertinent information as possible including any
       error messages resulting from running jfs_tune.

SEE ALSO
       jfs_fsck(8),	jfs_mkfs(8),	  jfs_fscklog(8),      jfs_logdump(8),
       jfs_debugfs(8)

AUTHOR
       Barry Arndt  (barndt@us.ibm.com)

       jfs_tune is maintained by IBM.
       See the JFS project web site for more details:
       http://jfs.sourceforge.net/

			       October 28, 2002			   jfs_tune(8)
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