1,ISL loads HPUX loader
2,HPUX loader checks in the BDRA to find the boot physical volume
3,HPUX loader reads LABEL file from the boot physical volume
4,to find the location of the root filesystem
5,HPUX loader now loads the /stand/vmunix kernel into memory
6,Kernel reads BDRA to configure root logical volume, primary swap logical volume and any dump logical volumes
To boot the system ,the kernel activates the volume group to which the system's root logical volume belongs. The location of the root logical volume is stored in the boot data reserved area(BDRA). The boot data reserved area contains the locations and sizes of LVM disks in the root volume group and other vital information to configure the root, primary swap, and dump logical volumes, and to mount the root file system.
The BDRA contains the following records about the system's root logical volumes: timestamp(indicating when the BDRA was last written), checksum for validating data, root volume group ID, the number of LVM disks in the root volume group, a list of the hardware addresses of the LVM disks in the root volume group,indices into that list for finding root, swap, and dump, and information needed to select the correct logical volumes for root, primary swap, and dumps.
Boot area in two parts: LIF header and LIF volume
LIF header contains pointers to files in LIF volume
LIF volume contains:
ISL- Initial System Loader
HPUX-Kernel loader
AUTO-contains the autoboot string
LABEL-used by HPUX to locate the root logical volume during a normal boot. Updated by lvlvboot and lvrmboot commands
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