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       jfs_mkfs - create a JFS formatted partition


       jfs_mkfs [options] device [ blocks ]


       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

       The default block size is 4096.


       jfs_mkfs will destroy all data on the specified device!


       -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:

                          Create  an external JFS journal on the given device.

                          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).


       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


       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:

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


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


       Barry Arndt  (
       William Braswell, Jr.

       jfs_mkfs is maintained by IBM.
       See the JFS project web site for more details:

                                 March 9, 2005                     jfs_mkfs(8)