7.2. Configure DRBD

Before we configure DRBD, we need to set aside some disk for it to use.

7.2.1. Create A Partition for DRBD

If you have more than 1Gb free, feel free to use it. For this guide however, 1Gb is plenty of space for a single html file and sufficient for later holding the GFS2 metadata.

[root@pcmk-1 ~]# lvcreate -n drbd-demo -L 1G VolGroup
  Logical volume "drbd-demo" created
[root@pcmk-1 ~]# lvs
  LV        VG       Attr   LSize   Origin Snap%  Move Log Copy%  Convert
  drbd-demo VolGroup -wi-a- 1.00G                                      
  lv_root   VolGroup -wi-ao   7.30G                                      
  lv_swap   VolGroup -wi-ao 500.00M

Repeat this on the second node, be sure to use the same size partition.

[root@pcmk-2 ~]# lvs
  LV      VG       Attr   LSize   Origin Snap%  Move Log Copy%  Convert
  lv_root VolGroup -wi-ao   7.30G                                      
  lv_swap VolGroup -wi-ao 500.00M                                      
[root@pcmk-2 ~]# lvcreate -n drbd-demo -L 1G VolGroup
  Logical volume "drbd-demo" created
[root@pcmk-2 ~]# lvs
  LV        VG       Attr   LSize   Origin Snap%  Move Log Copy%  Convert
  drbd-demo VolGroup -wi-a- 1.00G                                      
  lv_root   VolGroup -wi-ao   7.30G                                      
  lv_swap   VolGroup -wi-ao 500.00M