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System Administration Commands                           mkfs(1M)


mkfs - construct a file system


mkfs [-F FSType] [generic_options] [-o FSType- specific_options] raw_device_file [operands]


The mkfs utility constructs a file system on the raw_device_file by calling the specific mkfs module indi- cated by -F FSType. Note: ufs file systems are normally created with the newfs(1M) command. generic_options are independent of file system type. FSType-specific_options is a comma-separated list of keyword=value pairs (with no intervening spaces), which are FSType-specific. raw_device_file specifies the disk parti- tion on which to write the file system. It is required and must be the first argument following the specific_options (if any). operands are FSType-specific. See the FSType- specific manual page of mkfs (for example, mkfs_ufs (1M)) for a detailed description.


The following are the generic options for mkfs: -F Specify the FSType to be constructed. If -F is not specified, the FSType is determined from /etc/vfstab by matching the raw_device_file with a vfstab entry, or by consulting the /etc/default/fs file. -V Echo the complete command line, but do not execute the command. The command line is generated by using the options and arguments provided and adding to them information derived from /etc/vfstab or /etc/default/fs. This option may be used to verify and validate the command line. -m Return the command line which was used to create the file system. The file system must already exist. This option provides a means of determining the command used in constructing the file system. SunOS 5.10 Last change: 17 Nov 2000 1 System Administration Commands mkfs(1M) -o Specify FSType-specific options. See the manual page for the mkfs module specific to the file sys- tem type.


See largefile(5) for the description of the behavior of mkfs when encountering files greater than or equal to 2 Gbyte ( 2 **31 bytes).


/etc/default/fs Default file system type. Default values can be set for the following flags in /etc/default/fs. For exam- ple: LOCAL=ufs LOCAL The default partition for a command if no FSType is specified. /etc/vfstab List of default parameters for each file system


See attributes(5) for descriptions of the following attri- butes: ____________________________________________________________ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |_____________________________|_____________________________| | Availability | SUNWcsu | |_____________________________|_____________________________|


mkfs_ufs(1M), newfs(1M), vfstab(4), attributes(5), largefile(5) Manual pages for the FSType-specific modules of mkfs.


This command might not be supported for all FSTypes. SunOS 5.10 Last change: 17 Nov 2000 2 System Administration Commands mkfs(1M) You can use lofiadm to create a file that appears to a mkfs command as a raw device. You can then use a mkfs command to create a file system on that device. See lofiadm(1M) for examples of creating a UFS and a PC (FAT) file system (using mkfs_ufs(1M) and mkfs_pcfs(1M)) on a device created by lofiadm. SunOS 5.10 Last change: 17 Nov 2000 3 No manual entry for 1.

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