diff --git a/inventory/host_vars/db-datanommer01.phx2.fedoraproject.org b/inventory/host_vars/db-datanommer01.phx2.fedoraproject.org
index 06e91e9994..f2b4a847fc 100644
--- a/inventory/host_vars/db-datanommer01.phx2.fedoraproject.org
+++ b/inventory/host_vars/db-datanommer01.phx2.fedoraproject.org
@@ -20,6 +20,7 @@ databases:
 # These are normally group variables, but in this case db servers are often different
 lvm_size: 500000
 mem_size: 16384
+max_mem_size: "{{ mem_size * 2 }}"
 num_cpus: 8
 tcp_ports: [ 5432, 443 ]
 fas_client_groups: sysadmin-dba,sysadmin-noc,sysadmin-veteran