jfs_mkfs

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 size.

The default block size is R 4096 .

jfs_mkfs will destroy all data on the specified device!

./"********************************************* ./"* block size has not been implemented yet * ./"********************************************* ./".TP ./".BI -b " block_size" ./"Set the block size for a new JFS partition ./".RS ./" ./"Options for ./".I block_size ./"are: ./".BR 512 "," ./".BR 1024 "," ./".BR 2048 ", or" ./".BR 4096 "." ./" ./"Using small blocks (rather than large blocks) is more space efficient because it ./"reduces the amount of internal fragmentation within files and directories. ./"However, using large blocks (rather than small blocks) is more performance efficient ./"because block allocation activities may occur less often . ./" ./"If the ./".B -b ./"option is not used, the default block size is ./".BR 4096 "." ./".RE

I -c

I -j journal_device

I -J journal-options

jfs_mkfs -J journal_dev external-journal

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

I jfs_mkfs -J device=external-journal device

Instead of specifying a device name directly, external-journal can also be specified by either I LABEL= label or I 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 R -l , R -L , and -U options of jfs_tune(8).)

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

I -L volume_label

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

-O

I -q

I -s log_size

I -V

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 R 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 R jfs_mkfs .

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

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/