Update web/support/FAQ.rst

web/support/FAQ.rst

@@ -17,7 +17,7 @@ We have enabled two new volume types in Catania and Palermo regions:
    - volume type FAST: based on SSD disks
    - volume type CAPACITY: provides the same durability and nearly the same performance as the default type, but is better suited to build large volumes (> 1 TB).
 
- To create e.g. a SSD-based volume simply select the volume type "fast" in the "type" menu on the dashboard, or with the following CLI command::
+ To create e.g. a SSD-based volume simply select the volume type "fast" in the "type" menu on the dashboard, or with the following CLI command::  
 
     
     openstack volume create --type fast --size 10 test-ssd
@@ -25,6 +25,21 @@ We have enabled two new volume types in Catania and Palermo regions:
 N.B. By default fast volumes quota is set to zero. Users who need fast disks should make a request to cloud-support@garr.it.    
 
 
+How can I change volume type (garr-ct1 and garr-pa1 regions) 
+----------------------------------------------------------
+
+It is possible to change the type of existing volumes, e.g. from **default** to **fast** (based on SSD) type.
+
+To do so, first of all the volume must be detached and must not have snapshots (therefore it is not possible to change the type of system volumes).
+
+From the dashboard select the volume and from the scroll-down menu select "Change Volume Type". 
+N.B. don't forget to choose "Migration Policy: On Demand!"
+
+With the OpenStack CLI the volume retype command is::
+
+    openstack volume set --type <new_type> --retype-policy on-demand <volume-id>
+
+
 I need to migrate an instance from a region to another one
 ----------------------------------------------------------
 Please note that you need enough resource quota for the same project on the target region.