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extendfs(8)							  extendfs(8)



NAME

  extendfs - Extends UFS file systems

SYNOPSIS

  /sbin/extendfs [- s] [disk_blocks]  device_name

DESCRIPTION

  Use the extendfs command to increase the storage space in a UFS file sys-
  tem.	The file system	must not be mounted when you perform this operation.
  To extend a mounted (in use) UFS file	system,	use the	mount command with
  the -o extend	option.

  The procedure	for increasing the storage space of a UFS file system is as
  follows:

   1.  Look at the contents the	/etc/fstab file	to identify the	disk parti-
       tion that maps to the file system.

   2.  Ensure that there is available storage space on the target disk as
       follows:

	a.  If LSM is in use on	your system, use LSM commands to increase the
	    size of the	LSM volume as described	in the Logical Storage
	    Manager guide.

	b.  If LSM is not in use on your system, use the disklabel command or
	    the	diskconfig graphical user interface to check the current size
	    and	use of partitions on the disk.

   3.  If there	is adequate space on an	adjacent partition, use	the disklabel
       command to write	the current label to a file as follows:
	    # disklabel	-r dsk4	>> d4label

   4.  Edit the	disklabel file to change the size of the partition on which
       your UFS	file system resides.  Increase the number of disk blocks on
       the partition and decrease the disk block size of the adjacent parti-
       tion by an equivalent number.

   5.  Use the disklabel command with the -R option to write the revised
       label to	the raw	disk as	follows:
	    #  disklabel -R /dev/rdisk/dsk4 d4label

   6.  When the	disk label is revised, extend the file system using the
       extendfs	command.  You can either use the full extent of	the newly
       sized partition or extend the file system in stages.  The following
       example commands	show both methods.

	 +  To extend the file system to use all the available space, you
	    specify the	disk partition on which	the file system	resides, as
	    follows:
		 #  extendfs /dev/disk/dsk4g

	 +  To extend the file system to use only part of the available
	    space, you specify a number	of disk	blocks,	as follows:
		 #  extendfs -s	300000 /dev/disk/dsk4g

	    The	remainder of the extended partion is reserved for future use.

  You can extend a file	system as many times as	necessary, up to the physical
  limit	of the storage device.	When no	more space is available	on the
  storage device, you must back	up the file system using the dump command and
  restore the file system to a storage device that has more available space.

  Once you have	extended a file	system,	the operation cannot be	reversed
  except by a back up and restore operation. Use the dump command to back up
  the file system.  You	can then reset the partition sizes manually and
  restore the file system to the storage device.

ERRORS

  The disklabel	command	produces output	similar	to that	of the newfs command.
  If a list of disk blocks is not displayed on the terminal, the command has
  failed.  Verify the partition	settings and the mount status of the target
  file system.

  The disklabel	command	does not permit	you to overwrite a partition if	it is
  in use.  Refer to the	disklabel(8) reference page for	more information on
  label	errors.

FILES

  /sbin/extendfs
      Specifies	the command path.

RELATED	INFORMATION

  diskconfig(8), disklabel(8), mount(8), and fstab(4).