ccd.conf —
concatenated disk driver configuration file
The ccd.conf file defines the configuration of
  concatenated disk devices, or ccds. It is used by
  ccdconfig(8) when invoked
  with the -C option and at system boot time. For more
  information about the concatenated disk driver, see
  ccd(4).
Each line of the configuration file contains arguments as per the
    -c argument to
    ccdconfig(8):
ccd ileave
  [flags] dev
  [...]
  - ccd
- The name of the ccd.
- ileave
- The interleave, expressed in units of DEV_BSIZE.
      For serial concatenation, specify
      ‘0’.
- flags
- The flags for the device, which may be represented as a decimal number, a
      hexadecimal number, a comma-separated list of strings, or the word
      “none”.
- dev [...]
- The component partitions to be concatenated, which should be of type
      FS_CCD.
A ‘#’ is a comment, and everything to end of line is
    ignored. A ‘\’ at the end of a line indicates that the next
    line should be concatenated with the current. A ‘\’ preceding
    any character (other than the end of line) prevents that character's special
    meaning from taking effect.
An example /etc/ccd.conf:
#
# /etc/ccd.conf
# Configuration file for concatenated disk devices
#
# ccd           ileave  flags   component devices
ccd0            16      none    /dev/sd2e /dev/sd3e
 
The ccd.conf configuration file first appeared in
  NetBSD 1.1.