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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  sys‐
       tem.  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, exter‐
			  nal-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	aggre‐
	      gate size.

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