ProxmoxVE 2: Configuring DRBD

I am running ProxmoxVE 2.0-35/d07f49c3 on two nodes connected using a cross cable on gigabit nics.
host1 ip: 10.0.10.201
host2 ip: 10.0.10.202

Check if drbd module is available

modprobe -l | grep drbd

Check if drbd module is loaded

lsmod | grep drbd

If not, load it with

modprobe -v drbd

Check the module version

modinfo drbd | grep version

I installed the appropriate drbd8-utils package on both nodes

dpkg -i drbd8-utils_8.3.10-0_amd64.deb

I built my own deb from source. You can find my build here.

I shrank the data volume on both of
I made use of the extents I freed up by shrinking the data volume to create an lvm volume that will be used for drbd.

lvcreate --verbose --extents 50000 --name lv4drbd pve

Next I modified /etc/drbd.d/global_common.conf so that it only contains:

global {
    usage-count no;
}
common {
    protocol C;
    syncer {
        rate 30M; 
    }
}

Next I created a new resouce file /etc/drbd.d/drbd0.res

resource drbd0 {
    protocol C;
    startup {
        wfc-timeout  0;
        degr-wfc-timeout 60;
        become-primary-on both;
    }
    net {
        cram-hmac-alg sha1;
        shared-secret "drbd0-secret";
        allow-two-primaries;
        after-sb-0pri discard-zero-changes;
        after-sb-1pri discard-secondary;
        after-sb-2pri disconnect;
    }
    on host1 {
        device /dev/drbd0;
        disk /dev/pve/lv4drbd;
        address 10.0.10.201:7780;
        meta-disk internal;
    }
    on host2 {
        device /dev/drbd0;
        disk /dev/pve/lv4drbd;
        address 10.0.10.202:7780;
        meta-disk internal;
    }
}

I added the IP address of the other host into each of the /etc/hosts files.

Next I started drbd on both nodes with

/etc/init.d/drbd start

I then initialized drbd metatdata on both nodes with

drbdadm create-md drbd0

Next I brought up the device on both nodes with

drbdadm up drbd0

I checked the status on both nodes with

drbd-overview

Next I started synchronization(should be instantaneous) from one node with

drbdadm -- --clear-bitmap new-current-uuid drbd0

Lastly, I restarted the drbd service on both nodes to enable Primary/Primary operation

/etc/init.d/drbd stop
/etc/init.d/drbd start

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