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FSSCONFIG(8)              BSD System Manager's Manual             FSSCONFIG(8)

NAME
     fssconfig -- configure file system snapshot devices

SYNOPSIS
     fssconfig [-cx] device path backup [cluster [size]]
     fssconfig -u device
     fssconfig -l [-v] [device]

DESCRIPTION
     The fssconfig command configures file system snapshot pseudo disk
     devices.  It will associate the file system snapshot disk device with a
     snapshot of path allowing the latter to be accessed as though it were a
     disk.  Data written through the path will be saved in backup which must
     not reside on the snapshotted file system.  If backup is a regular file,
     it will be created with length size.  Default size is the size of path.
     Data is saved to backup in units of cluster bytes.

     Options indicate an action to be performed:

     -c   Configures the device.  If successful, references to device will
          access the contents of path at the time the snapshot was taken.  If
          backup is a directory, a temporary file will be created in this
          directory.  This file will be unlinked on exit.

     -l   List the snapshot devices and indicate which ones are in use.  If a
          specific device is given, then only that will be described.

     -u   Unconfigures the device.

     -v   Be more verbose listing the snapshot devices.

     -x   Unlink backup after the device is configured.

     If no action option is given, -c is assumed.

FILES
     /dev/rfss?
     /dev/fss?

EXAMPLES
           fssconfig fss0 /usr /tmp/back

     Configures the snapshot device fss0 for a snapshot of the /usr file sys-
     tem.  Data written through /usr will be backed up in /tmp/back.

           fssconfig fss1 / /dev/rsd0e 8192

     Configures the snapshot device fss1 for a snapshot of the / file system.
     Data written through / will be backed up in /dev/rsd0e.  The backup will
     take place in units of 8192 bytes.

           fssconfig -u fss0

     Unconfigures the fss0 device.

SEE ALSO
     opendisk(3), fss(4), mount(8), umount(8)

HISTORY
     The fssconfig command appeared in NetBSD 2.0.

BUGS
     The fss(4) driver is experimental.  Be sure you have a backup before you
     use it.

BSD                            December 10, 2003                           BSD