HardDisksManagement
Specifying the disk that will used to boot the machine
The path is :
/hardware/harddisks/<harddisk_name>/boot
It is a boolean that is used to define the value of DISK_BOOT_DEV. Have a look at the code of the template site/filesystems/layout :
... variable DISK_BOOT_DEV ?= boot_disk(); variable DISK_BOOT_DEV ?= { if (exists('/hardware/harddisks/sda')) { return('sda'); ...