LVM Version 2.0 Volume Groups in HP-UX 11i v3 (September 2008)

approximately 5 MB while the minimal memory footprint of a 1.0 volume group with the same extent size
provisioned for only 256 TB (8 times smaller) is 17 MB.
The minimum footprint of a 2.x volume group regardless of its provisioned size never exceeds 5 MB.
Maximum Memory Footprint
Figure 4 shows the memory footprint of 1.0 and 2.0 volume groups activated, fully populated, and with the worst
case volume group configuration.
To get the 2.1 footprint in the same conditions, add 30 MB to the 2.0 footprint. The 30 MB difference is because
in this maximum configuration, the 2.1 volume group contains 2047 physical and logical volumes while the 2.0
volume group contains only 511.
The worst case volume group configuration in terms of memory footprint is when all the extents of the volume
group are allocated to logical volumes, the maximum number of logical volumes and physical volumes are used
and everything is mirrored. Typically, users do not reach the maximum footprint even if all the extents are
allocated to logical volumes.
Note that this is not a one-to-one comparison between 1.0 and 2.x because the volume groups in Figure 4 are
assumed to contain the maximum number of logical and physical volumes, and the maxima for 2.x are higher. In
other words, the memory footprint of a 2.x volume group includes more volumes than 1.0. For an exact
comparison, see “Comparison of Volume Group Memory Footprints for the Same Number of Logical and Physical
Volumes”. However, the number of logical or physical volumes does not make a significant difference in the
memory footprint.
23