System administration command. Set up RAID array devices as defined in the /etc/raidtab configuration file. mkraid can be used to initialize a new array or upgrade older RAID device arrays for the new kernel. Initialization will destroy any data on the disk devices used to create the array.
Use file instead of /etc/raidtab.
Initialize the devices used to create the RAID array even if they currently have data.
Print a usage message and then exit.
Upgrade an older array to the current kernel's RAID version. Preserve data on the old array.