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mkfs.gfs2

NAME

mkfs.gfs2 - Make a GFS2 filesystem

SYNOPSIS

mkfs.gfs2 [OPTION]... DEVICE

DESCRIPTION

mkfs.gfs2 is used to create a Global File System.

OPTIONS

-c MegaBytes

Initial size of each journal's quota change file

-D

Enable debugging output.

-h

Print out a help message describing available options, then exit.

-J MegaBytes

The size of the journals in Megabytes. The default journal size is 32 megabytes. The minimum size is 8 megabytes.

-j Number

The number of journals for gfs2_mkfs to create. You need at least one journal per machine that will mount the filesystem. If this option is not specified, one journal will be created.

-O

This option prevents gfs2_mkfs from asking for confirmation before writing the filesystem.

-p LockProtoName

LockProtoName is the name of the locking protocol to use. Acceptable locking protocols are lock_dlm or if you are using GFS2 as a local filesystem (1 node only), you can specify the lock_nolock protocol. If this option is not specified, lock_nolock protocol will be assumed.

-q

Be quiet. Don't print anything.

-r MegaBytes

gfs2_mkfs will try to make Resource Groups about this big. Minimum RG size is 32 MB. Maximum RG size is 2048 MB. A large RG size may increase performance on very large file systems. If not specified, mkfs.gfs2 will choose the RG size based on the size of the file system: average size file systems will have 256 MB RGs, and bigger file systems will have bigger RGs for better performance.

-t LockTableName

The lock table field appropriate to the lock module you're using. It is clustername:fsname. Clustername must match that in cluster.conf; only members of this cluster are permitted to use this file system. Fsname is a unique file system name used to distinguish this GFS2 file system from others created (1 to 16 characters). Lock_nolock doesn't use this field.

-u MegaBytes

Initial size of each journal's unlinked tag file

-V

Print program version information, then exit.

EXAMPLE

gfs2_mkfs -t mycluster:mygfs2 -p lock_dlm -j 2 /dev/vg0/mygfs2

This will make a Global File System on the block device "/dev/vg0/mygfs2". It will belong to "mycluster" and register itself as wanting locking for "mygfs2". It will use DLM for locking and make two journals.

gfs2_mkfs -t mycluster:mygfs2 -p lock_nolock -j 3 /dev/vg0/mygfs2

This will make a Global File System on the block device "/dev/vg0/mygfs2". It will belong to "mycluster" and but have no cluster locking. It will have three journals.