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7.2. Allocate a Disk Volume for DRBD

DRBD will need its own block device on each node. This can be a physical disk partition or logical volume, of whatever size you need for your data. For this document, we will use a 512MiB logical volume, which is more than sufficient for a single HTML file and (later) GFS2 metadata.
[root@pcmk-1 ~]# vgdisplay | grep -e Name -e Free
  VG Name               centos_pcmk-1
  Free  PE / Size       255 / 1020.00 MiB
[root@pcmk-1 ~]# lvcreate --name drbd-demo --size 512M centos_pcmk-1
 Logical volume "drbd-demo" created.
[root@pcmk-1 ~]# lvs
  LV        VG            Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  drbd-demo centos_pcmk-1 -wi-a----- 512.00m
  root      centos_pcmk-1 -wi-ao----   3.00g
  swap      centos_pcmk-1 -wi-ao----   1.00g
Repeat for the second node, making sure to use the same size:
[root@pcmk-1 ~]# ssh pcmk-2 -- lvcreate --name drbd-demo --size 512M centos_pcmk-2
 Logical volume "drbd-demo" created.