jfs_tune(8) [centos man page]

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  jour-
	      nal.

	      mkfs.jfs -J journal_dev external-journal

	      Attach the external journal to the file system by using the command

	      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=volume_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  spe-
	      cial device name like /dev/hda1.

	      See uuidgen(8) for more information.

       -V     Print version information and exit (regardless of any other chosen options).

EXAMPLES

       Set a randomly-generated UUID for the JFS file system on the 3rd partition 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)

jfs_mkfs(8)						     JFS file system creation						       jfs_mkfs(8)

NAME

       jfs_mkfs - create a JFS formatted partition

SYNOPSIS

       jfs_mkfs [options] device [ blocks ]

DESCRIPTION

       jfs_mkfs is used to create (format) a JFS partition.  jfs_mkfs 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 and/or JFS journal will be
       created.  blocks is the number of blocks to be used for the file system.  If omitted, jfs_mkfs automatically figures the file system size.

       The default block size is 4096.

WARNING

       jfs_mkfs will destroy all data on the specified device!

OPTIONS

       -c     Check the device for bad blocks before building the file system.

       -j journal_device
	      Create the external JFS journal on journal_device , create the JFS file system on device , and attach the external  journal  to  the
	      file system.

       -J journal-options
	      Create  the  JFS	journal  on its own device or attach an external JFS journal to the JFS file system using options specified on the
	      command-line.  The following journal options are supported:

		   journal_dev
			  Create an external JFS journal on the given device.

		   device=external-journal
			  Attach an existing external JFS journal located on external-journal to the JFS file  system  that  will  be  created	on
			  device.  The external journal must already have been created using the command

			  jfs_mkfs -J journal_dev external-journal

			  Attach the external journal to the file system being created by using the command

			  jfs_mkfs -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
			  to locate the external journal by either the volume label or UUID stored in the JFS external log superblock at the start
			  of  the  journal.  Use jfs_tune(8) to display a journal device's volume label and UUID.  (See the -l, -L, and -U options
			  of jfs_tune(8).)

	      Only one of the journal_dev or device= options can be given per jfs_mkfs issuance.

       -L volume_label
	      Set the volume label for the newly formatted device.

	      If -L volume_label is used along with -J journal_device, the volume label of the specified external journal device will  be  set	to
	      volume_label.  Otherwise, the volume label of the JFS file system will be set to volume_label.

       -O     Provide case-insensitive support for compatibility with OS/2.

       -q     Quiet execution - do not ask for confirmation before creating the file system.

       -s log_size
	      Set  the	log  size  (in	megabytes) of the inline log.  If the -s option is not used, the default log size is 0.4% of the aggregate
	      size.

       -V     Print version information and exit (regardless of any other chosen options).

EXAMPLES

       Format 3rd partition on 2nd hard disk with the volume label "JFS_hdb3":

	      jfs_mkfs -L JFS_hdb3 /dev/hdb3

       Format 5th partition on 1st hard disk, verifying each block created:

	      jfs_mkfs -c /dev/hda5

       Format 3rd partition on 2nd hard disk as external journal, format 4th partition on 1st hard disk as JFS file system, and attach the  exter-
       nal journal to the file system:

	      jfs_mkfs -j /dev/hdb3 /dev/hda4

REPORTING BUGS

       If you find a bug in JFS or jfs_mkfs, 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_mkfs.

SEE ALSO

       mkfs(8), jfs_fsck(8), jfs_fscklog(8), jfs_tune(8), jfs_logdump(8), jfs_debugfs(8)

AUTHORS

       Barry Arndt  (barndt@us.ibm.com)
       William Braswell, Jr.

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

								   March 9, 2005						       jfs_mkfs(8)