Man Linux: Main Page and Category List


       mkfs.gfs2 - Make a GFS2 filesystem


       mkfs.gfs2 [OPTION]... DEVICE [ block-count ]


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


       -b BlockSize
              Set  the  filesystem block size to BlockSize (must be a power of
              two).  The minimum block size is 512.  The FS block size  cannot
              exceed   the   machine’s   memory   page   size.   On  the  most
              architectures (i386, x86_64, s390, s390x), the memory page  size
              is  4096  bytes.   On other architectures it may be bigger.  The
              default block size is 4096 bytes.  In general, GFS2  filesystems
              should not deviate from the default value.

       -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 128 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 (for shared storage)
              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_dlm 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

       -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.

       [ block-count ]
              Make  the  file  system  this  many  blocks  in  size.   If  not
              specified, the entire length of the specified device is used.


       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.