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jfs_tune




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
              (Experimental)   Only  supported  on  JFS  versions
              (1.0.18 or later) that  support  external  journal.
              Attach  the  JFS external journal located on exter­
              nal-journal to the JFS file system on device.

              Currently, you may only attach a  single  JFS  file
              system  device  to  a  single  JFS external journal
              (i.e. each JFS file system using an external  jour­
              nal must have a unique external journal).

              The external journal must already have been created
              using the command

              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 exter­
              nal 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
                   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 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://oss.software.ibm.com/jfs

       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


  
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