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Configure DRBD

7.2.1. Create A Partition for DRBD
7.2.2. Write the DRBD Config
7.2.3. Initialize and Load DRBD
7.2.4. Populate DRBD with Data
Before we configure DRBD, we need to set aside some disk for it to use.

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