Manual browser: ccdconfig(8)

CCDCONFIG(8) System Manager's Manual CCDCONFIG(8)


ccdconfigconfiguration utility for the concatenated disk driver


ccdconfig [-cv] ccd ileave [flags] dev [...]

ccdconfig -C [-v] [-f config_file]

ccdconfig -u [-v] ccd [...]

ccdconfig -U [-v] [-f config_file]

ccdconfig -g [ccd [...]]


ccdconfig is used to dynamically configure and unconfigure concatenated disk devices, or ccds. For more information about the ccd, see ccd(4).

The options are as follows:

Configure a ccd. This is the default behavior of ccdconfig.
Configure all ccd devices listed in the ccd configuration file.
-f config_file
When configuring or unconfiguring all devices, read the file config_file instead of the default /etc/ccd.conf.
Dump the current ccd configuration in a format suitable for use as the ccd configuration file. If no arguments are specified, every configured ccd is dumped. Otherwise, the configuration of each listed ccd is dumped.
Unconfigure a ccd.
Unconfigure all ccd devices listed the ccd configuration file.
Causes ccdconfig to be verbose.

A ccd is described on the command line and in the ccd configuration file by the name of the ccd, the interleave factor, the ccd configuration flags, and a list of one or more devices. The flags may be represented as a decimal number, a hexadecimal number, a comma-separated list of strings, or the word “none”. The flags are as follows:

Symbolic Numeric Comment
CCDF_UNIFORM 0x02 Use uniform interleave. The size of all components is clamped to that of the smallest component.
CCDF_NOLABEL 0x04 Ignore raw disklabel. Useful when creating a new ccd.


The file /etc/ccd.conf is used to configure ccdconfig if -C or -U is used. Each line of the configuration file contains arguments as per the -c argument: ccd ileave [flags] dev [...]

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.

See EXAMPLES for an example of /etc/ccd.conf.


/etc/ccd.conf - default ccd configuration file.


The following command, executed from the command line, would configure ccd0 with 4 components (/dev/sd2e, /dev/sd3e, /dev/sd4e, /dev/sd5e), and an interleave factor of 32 blocks.

# ccdconfig ccd0 32 0 /dev/sd2e /dev/sd3e /dev/sd4e /dev/sd5e

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 ccdconfig command first appeared in NetBSD 1.1.
October 17, 2003 NetBSD 7.0