Creating an LVM volume group using physical disks

Use the following instructions to create an LVM volume group on the block storage node or nodes.

Before you begin

Note: Not supported for the HA controller +n compute topology.

The LVM iSCSI volume driver uses a volume group named "cinder-volumes" by default. These instructions use that name.

Identify the block devices that you want to use on the block storage node. This can be an entire disk (for example, /dev/sdb) or a partition (for example, /dev/sdba). You can use tools like df and pvs to identify devices that are used by existing mounted file system or LVM volume groups.
Create an LVM physical volume over each block device using the pvcreate command. To create an LVM physical volume for /dev/sdb, use this command:
```
# pvcreate /dev/sdb
```
Create a "cinder-volumes" LVM volume group using the physical volume or volumes you previously created:
```
# vgcreate cinder-volumes /dev/sdb [additional devices]
```