1jfs_mkfs(8) JFS file system creation jfs_mkfs(8)
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6 jfs_mkfs - create a JFS formatted partition
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10 jfs_mkfs [options] device [ blocks ]
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14 jfs_mkfs is used to create (format) a JFS partition. jfs_mkfs must be
15 run as root.
16 device is the special file name corresponding to the actual device
19 (e.g. /dev/hdb1) on which a JFS file system and/or JFS journal will be
20 created. blocks is the number of blocks to be used for the file sys‐
21 tem. If omitted, jfs_mkfs automatically figures the file system size.
22 The default block size is 4096.
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28 jfs_mkfs will destroy all data on the specified device!
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32 -c Check the device for bad blocks before building the file system.
33 -j journal_device
37 Create the external JFS journal on journal_device , create the
38 JFS file system on device , and attach the external journal to
39 the file system.
40 -J journal-options
43 Create the JFS journal on its own device or attach an external
44 JFS journal to the JFS file system using options specified on
45 the command-line. The following journal options are supported:
46 journal_dev
48 Create an external JFS journal on the given device.
49 device=external-journal
51 Attach an existing external JFS journal located on
52 external-journal to the JFS file system that will be
53 created on device. The external journal must
54 already have been created using the command
55 jfs_mkfs -J journal_dev external-journal
57 Attach the external journal to the file system being
59 created by using the command
60 jfs_mkfs -J device=external-journal device
62 Instead of specifying a device name directly, exter‐
64 nal-journal can also be specified by either
65 LABEL=label or UUID=UUID to locate the external
66 journal by either the volume label or UUID stored in
67 the JFS external log superblock at the start of the
68 journal. Use jfs_tune(8) to display a journal
69 device's volume label and UUID. (See the -l, -L,
70 and -U options of jfs_tune(8).)
71 Only one of the journal_dev or device= options can be given per
73 jfs_mkfs issuance.
74 -L volume_label
77 Set the volume label for the newly formatted device.
78 If -L volume_label is used along with -J journal_device, the
80 volume label of the specified external journal device will be
81 set to volume_label. Otherwise, the volume label of the JFS
82 file system will be set to volume_label.
83 -O Provide case-insensitive support for compatibility with OS/2.
86 -q Quiet execution - do not ask for confirmation before creating
89 the file system.
90 -s log_size
93 Set the log size (in megabytes) of the inline log. If the -s
94 option is not used, the default log size is 0.4% of the aggre‐
95 gate size.
96 -V Print version information and exit (regardless of any other cho‐
99 sen options).
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103 Format 3rd partition on 2nd hard disk with the volume label "JFS_hdb3":
104 jfs_mkfs -L JFS_hdb3 /dev/hdb3
106 Format 5th partition on 1st hard disk, verifying each block created:
108 jfs_mkfs -c /dev/hda5
110 Format 3rd partition on 2nd hard disk as external journal, format 4th
112 partition on 1st hard disk as JFS file system, and attach the external
113 journal to the file system:
114 jfs_mkfs -j /dev/hdb3 /dev/hda4
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118 If you find a bug in JFS or jfs_mkfs, please report it via the bug
119 tracking system ("Report Bugs" section) of the JFS project web site:
120 http://jfs.sourceforge.net/
121 Please send as much pertinent information as possible including any
123 error messages resulting from running jfs_mkfs.
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127 mkfs(8), jfs_fsck(8), jfs_fscklog(8), jfs_tune(8), jfs_logdump(8),
128 jfs_debugfs(8)
129
133 Barry Arndt (barndt@us.ibm.com)
134 William Braswell, Jr.
135 jfs_mkfs is maintained by IBM.
137 See the JFS project web site for more details:
138 http://jfs.sourceforge.net/
139 March 9, 2005 jfs_mkfs(8)