Normally, all configured DRBD resources are automatically enabled

If, however, you need to enable resources manually for any reason, you may do so by issuing the command

# drbdadm up <resource>

As always, you may use the keyword all instead of a specific resource name if you want to enable all resources configured in /etc/drbd.conf at once.

You may temporarily disable specific resources by issuing the command

# drbdadm down <resource>

Here, too, you may use the keyword all in place of a resource name if you wish to temporarily disable all resources listed in /etc/drbd.conf at once.