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 (Experimental) Create the external JFS journal on journal_device
38 , create the JFS file system on device , and attach the external
39 journal to the file system.
40 -J journal-options
43 (Experimental) Create the JFS journal on its own device or
44 attach an external JFS journal to the JFS file system using
45 options specified on the command-line. The following journal
46 options are supported:
47 journal_dev
49 Create an external JFS journal on the given device.
50 device=external-journal
52 Attach an existing external JFS journal located on
53 external-journal to the JFS file system that will be
54 created on device. The external journal must
55 already have been created using the command
56 jfs_mkfs -J journal_dev external-journal
58 Attach the external journal to the file system being
60 created by using the command
61 jfs_mkfs -J device=external-journal device
63 Instead of specifying a device name directly, exter‐
65 nal-journal can also be specified by either
66 LABEL=label or UUID=UUID to locate the external
67 journal by either the volume label or UUID stored in
68 the JFS external log superblock at the start of the
69 journal. Use jfs_tune(8) to display a journal
70 device's volume label and UUID. (See the -l, -L,
71 and -U options of jfs_tune(8).)
72 Only one of the journal_dev or device= options can be given per
74 jfs_mkfs issuance.
75 -L volume_label
78 Set the volume label for the newly formatted device.
79 If -L volume_label is used along with -J journal_device, the
81 volume label of the specified external journal device will be
82 set to volume_label. Otherwise, the volume label of the JFS
83 file system will be set to volume_label.
84 -O Provide case-insensitive support for compatibility with OS/2.
87 -q Quiet execution - do not ask for confirmation before creating
90 the file system.
91 -s log_size
94 Set the log size (in megabytes) of the inline log. If the -s
95 option is not used, the default log size is 0.4% of the aggre‐
96 gate size.
97 -V Print version information and exit (regardless of any other cho‐
100 sen options).
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104 Format 3rd partition on 2nd hard disk with the volume label "JFS_hdb3":
105 jfs_mkfs -L JFS_hdb3 /dev/hdb3
107 Format 5th partition on 1st hard disk, verifying each block created:
109 jfs_mkfs -c /dev/hda5
111 Format 3rd partition on 2nd hard disk as external journal, format 4th
113 partition on 1st hard disk as JFS file system, and attach the external
114 journal to the file system:
115 jfs_mkfs -j /dev/hdb3 /dev/hda4
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119 If you find a bug in JFS or jfs_mkfs, please report it via the bug
120 tracking system ("Report Bugs" section) of the JFS project web site:
121 http://jfs.sourceforge.net/
122 Please send as much pertinent information as possible including any
124 error messages resulting from running jfs_mkfs.
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128 mkfs(8), jfs_fsck(8), jfs_fscklog(8), jfs_tune(8), jfs_logdump(8),
129 jfs_debugfs(8)
130
134 Barry Arndt (barndt@us.ibm.com)
135 William Braswell, Jr.
136 jfs_mkfs is maintained by IBM.
138 See the JFS project web site for more details:
139 http://jfs.sourceforge.net/
140 March 9, 2005 jfs_mkfs(8)