DRBD

How to setup DRBD with separated resource and meta-disk

On both servers

• Create 2 separate partitions on each server, one for meta and one for data. Some meta-disk size approximations:

Block device size	DRBD meta data
1 GB	2 MB
100 GB	4+1 MB
500 GB	16+2 MB
1 TB	32+2 MB
2 TB	64+1 MB
4 TB	128 MB

• If the meta-disk and resource partition are both listed on /etc/fstab, then remove them from there
• Install drbd

# apt-get -y install drbd8-utils

• Edit drbd.conf to something similar to:

global { usage-count no; }
common { syncer { rate 100M; } }
resource srv {
       protocol C;
       startup {
               wfc-timeout  15;
               degr-wfc-timeout 60;
       }
       net {
               cram-hmac-alg sha1;
               shared-secret "B1ng0!";
       }
       on SERVER-01p {
               device /dev/drbd0;
               disk /dev/md4;
               address IP_SERVER-01p:7788;
               meta-disk /dev/md3[0];
       }
       on SERVER-01s {
               device /dev/drbd0;
               disk /dev/md4;
               address IP_SERVER-01s:7788;
               meta-disk /dev/md3[0];
       }
}

• Create resource and meta-disk

# drbdadm create-md srv

• Start DRBD

# service drbd start

On primary server only
When finish the previous setup on both servers

• Tell DRBD which one is the