fix partition sizes

roles/docker/templates/docker-storage-setup

@@ -1,9 +1,27 @@
 STORAGE_DRIVER=devicemapper
 DOCKER_ROOT_VOLUME=yes
 
-{% if docker_storage_disk is defined %}
-DEVS={{ docker_storage_disk }}
-{% endif %}
 {% if docker_storage_vg is defined %}
 VG={{ docker_storage_vg }}
 {% endif %}
+
+# Enable automatic extension of pool by lvm. lvm can monitor
+# the pool and automatically extend it when pool is getting full.
+AUTO_EXTEND_POOL=true
+
+# Determines the pool extension threshold in terms of percentage
+# of pool size. For example, if threshold is 60, that means when
+# pool is 60% full, threshold has been hit.
+POOL_AUTOEXTEND_THRESHOLD=80
+
+# Determines the amount by which pool needs to be grown. This is
+# specified in terms of % of pool size. So a value of 20 means
+# that when threshold is hit, pool will be grown by 20% of existing
+# pool size.
+POOL_AUTOEXTEND_PERCENT=20
+
+# Create a Logical Volume of 20G for /var/lib/docker
+DOCKER_ROOT_VOLUME_SIZE=20G
+
+# Create a Thinpool Logical Volume of 50G for Container Storage
+DATA_SIZE=50G