HP-UX HB v13.00 Ch-13 - LVM

HP-UX Handbook – Rev 13.00 Page 7 (of 110)

Chapter 13 LVM

October 29, 2013

2912K

other LVM disks—and they differ in their data structures. Non-bootable disks have two

reserved areas: the physical volume reserved area (PVRA) and the volume group

reserved area (VGRA). Bootable disks have a PVRA and VGRA, and additional sectors

reserved for the boot data reserved area (BDRA) and boot LIF.

The following image shows the on disk structure of an LVM disk:

non-bootable bootable

disk disk

PVRA

LIF header

VGRA

PVRA

User Data

BDRA

LIF volume

VGRA

User Data

Bad block pool

NOTE: the LVM header of a bootable disk is always 2912 KB. The header size of a

non-bootable disk is not fixed. It depends on the VG configuration parameters

PVs/VG (-p max_pv), PEs/PV (-e max_pe) and LVs/VG (-l max_lv), but it is usually

smaller. The VG’s VGRA must not be larger than a single extent..

NOTE: Itanium systems have a 100MB EFI partition at the beginning of the disk. Refer

to the Itanium Chapter for details.

PVRA, BDRA and VGRA

1. The PVRA is unique for every PV in the VG. It contains:

 LVMREC describing the PV with e.g. PV-ID, VG-ID, PV number in VG, PE

size; start and length of: VGRA, BDRA (if any), BBDIR, User Data and the

Bad Block Pool; in case of a Serviceguard cluster the Cluster ID and

information about the Cluster Lock Area.

 BBDIR (Bad Block Directory, maintaining the Bad Block Pool).

2. The BDRA (only created with pvcreate –B) contains boot relevant information,

e.g.: