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# ctladm create -b block -o file=/data/target0
This presents the contents of the image file [.filename]#/data/target0# as a LUN to the USB host. The file must exist before executing the command. To configure the LUN at system startup, add the command to [.filename]#/etc/rc.local#.
man:ctld[8] can also be used to manage LUNs. Create [.filename]#/etc/ctl.conf#, add a line to [.filename]#/etc/rc.conf# to make sure man:ctld[8] is automatically started at boot, and then start the daemon.
This is an example of a simple [.filename]#/etc/ctl.conf# configuration file. Refer to man:ctl.conf[5] for a more complete description of the options.
target naa.50015178f369f092 {
lun 0 {
path /data/target0
size 4G
}
}
The example creates a single target with a single LUN. The `naa.50015178f369f092` is a device identifier composed of 32 random hexadecimal digits. The `path` line defines the full path to a file or zvol backing the LUN. That file must exist before starting man:ctld[8]. The second line is optional and specifies the size of the LUN.
To make sure the man:ctld[8] daemon is started at boot, add this line to [.filename]#/etc/rc.conf#:
ctld_enable="YES"
To start man:ctld[8] now, run this command:
# service ctld start
As the man:ctld[8] daemon is started, it reads [.filename]#/etc/ctl.conf#. If this file is edited after the daemon starts, reload the changes so they take effect immediately:
# service ctld reload