HP-UX Reference (11i v2 04/09) - 7 Device (Special) Files, 9 General Information, Index (vol 10)

lvm(7) lvm(7)

EXAMPLES

The basic steps to take to begin using LVM are as follows:

• Identify the disks to be used for LVM.

• Create an LVM data structure on each identiﬁed disk (see pvcreate (1M)).

• Collect all the physical volumes to form a new volume group (see vgcreate (1M)).

• Create logical volumes from the space in the volume group (see lvcreate (1M)).

• Use each logical volume as if it were a disk section (create a ﬁle system, or use for raw access).

To conﬁgure disk

/dev/dsk/c0t0d0

as part of a new volume group named

vg01.

First, initialize the disk for LVM with the

pvcreate command.

pvcreate /dev/rdsk/c0t0d0

Then, create the pseudo device ﬁle that is used by the LVM subsystem.

mkdir /dev/vg01

mknod /dev/vg01/group c 64 0x030000

The minor number for the group ﬁle should be unique among all the volume groups on the system.

It has the format 0xNN0000, where NN ranges from 00 to 09. The maximum value of NN is con-

trolled by the kernel tunable parameter,

maxvgs.

Create the volume group,

vg01, containing the physical volume, /dev/dsk/c0t0d0

, with the

vgcreate command.

vgcreate /dev/vg01 /dev/dsk/c0t0d0

You can view information about the newly created volume group with the vgdisplay command.

vgdisplay -v /dev/vg01

Create a logical volume of size 100 MB, named usrvol, on this volume group with the

lvcreate

command.

lvcreate -L 100 -n usrvol /dev/vg01

This creates two device ﬁles for the logical volume, /dev/vg01/usrvol

, which is the block device

ﬁle, and

/dev/vg01/rusrvol

, which is the character (raw) device ﬁle.

You can view information about the newly created logical volume with the

lvdisplay command.

lvdisplay /dev/vg01/lvol1

Any operation allowed on a disk partition is allowed on the logical volume. Thus, you can use

usrvol to hold a ﬁle system.

newfs /dev/vg01/rusrvol hp7937

mount /dev/vg01/usrvol /usr