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Note
At boot time, the system firmware provides you with a short time period during which you can manually override the automatic boot process and select an alternate boot device. For information on how to boot your system from a device other than the primary or alternate boot devices, and how to change the primary and alternate boot devices.
Before the kernel mounts the root file system, it determines if the boot disk is a rootable VxVM disk. If it is such a disk, the kernel passes control to its VxVM rootability code. This code extracts the starting block number and length of the root and swap volumes from the LIF LABEL record, builds temporary volume and disk configuration objects for these volumes, and then loads this configuration into the VxVM kernel driver. At this point, I/O can take place for these temporary root and swap volumes by referencing the device number set up by the rootability code.
When the kernel has passed control to the initial user procedure, the VxVM configuration daemon (vxconfigd) is started. vxconfigd reads the configuration of the volumes in the bootdg disk group and loads them into the kernel. The temporary root and swap volumes are then discarded. Further I/O for these volumes is performed using the VxVM configuration objects that were loaded into the kernel.