{"id":3655,"date":"2022-12-20T17:09:17","date_gmt":"2022-12-20T20:09:17","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/jfs_tune-man8\/"},"modified":"2022-12-20T17:09:17","modified_gmt":"2022-12-20T20:09:17","slug":"jfs_tune-man8","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/jfs_tune-man8\/","title":{"rendered":"jfs_tune (man8)"},"content":{"rendered":"

jfs_tune<\/h1>\n

NAME<\/a>
SYNOPSIS<\/a>
DESCRIPTION<\/a>
OPTIONS<\/a>
EXAMPLES<\/a>
REPORTING BUGS<\/a>
SEE ALSO<\/a>
AUTHOR<\/a> <\/p>\n

\n

NAME <\/a> <\/h2>\n

jfs_tune<\/b> \u2212 adjust tunable file system parameters on JFS<\/p>\n

SYNOPSIS <\/a> <\/h2>\n

jfs_tune<\/b> [options] device<\/i><\/p>\n

DESCRIPTION <\/a> <\/h2>\n

jfs_tune<\/b><\/i> adjusts tunable parameters on a Linux JFS file system or external journal. jfs_tune<\/b> must be run as root.<\/p>\n

device<\/i> is the special file name corresponding to the actual device (e.g. \/dev\/hdb1<\/i>) on which a JFS file system or JFS external journal has been created.<\/p>\n

OPTIONS <\/a> <\/h2>\n

\u2212J device=<\/b>external-journal<\/i><\/p>\n

Attach the JFS external journal located on external-journal<\/i> to the JFS file system on device<\/i>.<\/p>\n

The external journal must already have been created using the command. More than one file system may share the same external journal.<\/p>\n

mkfs.jfs -J journal_dev<\/b> external-journal<\/i><\/p>\n

Attach the external journal to the file system by using the command<\/p>\n

jfs_tune -J device=<\/b>external-journal device<\/i><\/p>\n

Instead of specifying a device name directly, external-journal<\/i> can also be specified by either LABEL=<\/b>label<\/i> or UUID=<\/b>UUID<\/i> (Use jfs_tune -l<\/b> device<\/i> to display a journal device\u2019s volume label and UUID.)<\/p>\n\n\n
<\/td>\n\n

\u2212l<\/b><\/p>\n<\/td>\n

<\/td>\n\n

List the contents of the JFS file system or external journal superblock that resides on device<\/i>.<\/p>\n<\/td>\n<\/tr>\n<\/table>\n

\u2212L<\/b> volume-label<\/i><\/p>\n

Set the volume label of the JFS file system or external journal. JFS labels can be at most 16 characters long; if volume-label<\/i> is longer than 16 characters, jfs_tune<\/b> will truncate it and print a warning. The volume label can be used by mount<\/b>(8), fsck<\/b>(8), and \/etc\/fstab<\/b>(5) (and possibly others) by specifying LABEL=<\/b>volume_label<\/i> instead of a block special device name like \/dev\/hda5<\/b>.<\/p>\n

\u2212U<\/b> UUID<\/i><\/p>\n

Set the universally unique identifier (UUID) of the file system or external journal device to UUID<\/i>. The format of the UUID is a series of hex digits separated by hyphens, like this: “c1b9d5a2-f162-11cf-9ece-0020afc76f16”. The UUID<\/i> parameter may also be one of the following:<\/p>\n\n\n\n\n
<\/td>\n\n

clear<\/i><\/p>\n<\/td>\n

<\/td>\n\n

clear the file system UUID<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n
<\/td>\n\n

random<\/i><\/p>\n<\/td>\n

<\/td>\n\n

generate a new randomly-generated UUID<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n
<\/td>\n\n

time<\/i><\/p>\n<\/td>\n

<\/td>\n\n

generate a new time-based UUID<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n<\/table>\n

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

See uuidgen<\/b>(8) for more information.<\/p>\n\n\n
<\/td>\n\n

\u2212V<\/b><\/p>\n<\/td>\n

<\/td>\n\n

Print version information and exit (regardless of any other chosen options).<\/p>\n<\/td>\n<\/tr>\n<\/table>\n

EXAMPLES <\/a> <\/h2>\n

Set a randomly-generated UUID for the JFS file system on the 3rd partition of the 2nd hard disk, and view the resultant superblock:<\/p>\n

jfs_tune -l -U random \/dev\/hdb3<\/b><\/p>\n

Attach an already existing external journal on a device labeled JFSLog to a JFS file system on \/dev\/hda8:<\/p>\n

jfs_tune -J device=LABEL=JFSLog \/dev\/hda8<\/b><\/p>\n

REPORTING BUGS <\/a> <\/h2>\n

If you find a bug in JFS<\/b> or jfs_tune<\/b>, please report it via the bug tracking system (“Report Bugs” section) of the JFS project web site:
http:\/\/jfs.sourceforge.net\/<\/p>\n

Please send as much pertinent information as possible including any error messages resulting from running jfs_tune<\/b>.<\/p>\n

SEE ALSO <\/a> <\/h2>\n

jfs_fsck<\/b>(8), jfs_mkfs<\/b>(8), jfs_fscklog<\/b>(8), jfs_logdump<\/b>(8), jfs_debugfs<\/b>(8)<\/p>\n

AUTHOR <\/a> <\/h2>\n

Barry Arndt (barndt@us.ibm.com)<\/p>\n

jfs_tune<\/b> is maintained by IBM.
See the JFS project web site for more details:
http:\/\/jfs.sourceforge.net\/<\/p>\n

\n","protected":false},"excerpt":{"rendered":"

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