HP-UX System Administrator's Guide: Logical Volume Management (762803-001, March 2014)

3.3.2.2 Creating a Version 1.0 Volume Group
To create a Version 1.0 volume group, use the vgcreate command, specifying each physical
volume to be included. For example:
# vgcreate /dev/vgname /dev/disk/disk3
Use the block device file to include each disk in your volume group. You can assign all the physical
volumes to the volume group with one command, or create the volume group with a single physical
volume. No physical volume can already be part of an existing volume group.
You can set volume group attributes using the following options:
-V 1.0 Version 1.0 volume group (default)
-s pe_size Size of a physical extent in MB (default 4)
-e max_pe Maximum number of physical extents per physical volume (default 1016)
-l max_lv Maximum number of logical volumes (default 255)
-p max_pv Maximum number of physical volumes (default 255)
The size of a physical volume is limited by pe_size times max_pe. If you plan to assign a disk
larger than approximately 4 GB (1016 * 4 MB) to this volume group, use a larger value of pe_size
or max_pe.
The size of the LVM metadata on each disk depends on max_lv, max_pv, and max_pe. If the
vgcreate options would cause the metadata to exceed its available space, vgcreate does not
create the volume group. You must select new values of max_lv, max_pv, and max_pe. For
example, if you plan to use disks larger than 100 GB, consider reducing max_pv. For
recommendations on choosing an optimal extent size, see Appendix C (page 169).
3.3.2.3 Creating a Version 2.x Volume Group
For Version 2.x volume groups, the vgcreate command does not require maximum values for
the number of physical volumes (-p), number of logical volumes (-l), or extents per physical
volume (-e). Instead you must specify only the extent size (-s) and the maximum size to which the
volume group can grow (-S). For example:
# vgcreate -V 2.0 -s pe_size -S vg_size /dev/vgname /dev/disk/disk3
Use the block device file to include each disk in your volume group. You can assign all the physical
volumes to the volume group with one command, or create the volume group with a single physical
volume. No physical volume can already be part of an existing volume group.
You must use the following options:
-V 2.x Version 2.x (such as 2.0, 2.1, or 2.2) volume group
-s pe_size Size of a physical extent in MB
-S vg_size Maximum future size of the volume group
The size of a volume group is the sum of the user data space on all physical
volumes assigned to the volume group. vg_size is not the size of the volume
group at creation; it is the size to which the volume group can grow in the future.
This value can be specified in megabytes, gigabytes, terabytes, or petabytes, by
adding the character m, g, t, or p, respectively. For example, to specify a
maximum size of two terabytes, use -S 2t.
In a Version 2.x volume group, the number of physical extents in a volume group has an architectural
limit, so your choice of physical extent size affects the maximum size of the volume group. To
display the maximum volume group size for a given physical extent size, use the -E option to
vgcreate with the -s option. For example:
# vgcreate -V 2.0 -E -s 256
Max_VG_size=2p:extent_size=256m
48 Administering LVM