a little more info in the basic instance creation example

howto/ganeti.md

@@ -39,7 +39,8 @@ See also the more extensive [glossary in the Ganeti documentation](http://docs.g
 ## Adding a new instance
 
 This command creates a new guest, or "instance" in Ganeti's
-vocabulary:
+vocabulary with 10G root, 2G swap, 20G spare on SSD, 800G on HDD, 8GB
+ram and 2 CPU cores:
 
     gnt-instance add \
       -o debootstrap+buster \
@@ -54,6 +55,20 @@ vocabulary:
       --backend-parameters memory=8g,vcpus=2 \
       test-01.torproject.org
 
+This is the same without the HDD partition:
+
+    gnt-instance add \
+      -o debootstrap+buster \
+      -t drbd --no-wait-for-sync \
+      --net 0:ip=pool,network=gnt-fsn \
+      --no-ip-check \
+      --no-name-check \
+      --disk 0:size=10G \
+      --disk 1:size=2G,name=swap \
+      --disk 2:size=20G \
+      --backend-parameters memory=8g,vcpus=2 \
+      test-01.torproject.org
+
 ### What that does
 
 This configures the following: