extendfs(8)						      System Manager's Manual						       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 system.  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: Look at the contents the /etc/fstab file to identify the
       disk  partition that maps to the file system.  Ensure that there is available storage space on the target disk as follows: 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.  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.  If there is adequate space on an adjacent partition, use the disklabel command to write the current label to a file  as  fol-
       lows:  #  disklabel  -r	dsk4  > d4label 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 partition  by  an  equivalent  number.
       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
       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

       Specifies the command path.

RELATED INFORMATION

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

																       extendfs(8)