extendfs - Extends UFS file systems
/sbin/extendfs [-s disk_blocks] device_name
Specifies the total number of 512-byte blocks for the UFS
file system.
Note
This value is not an increment. Specifying a value
with this option does not increment the file system
by that value; rather, it is the new size of the
file system.
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 -u -o
extend mnt_point parameters.
The procedure for increasing the storage space of a UFS
file system is as follows: Look at the contents of 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 follows: # 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
the total number of disk blocks to be used, 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.
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.
Specifies the command path.
diskconfig(8), disklabel(8), mount(8), and fstab(4).
extendfs(8)
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