Hello List, On XCP1.5 ballooning of CentOS6.X does not work correctly. The DomU can be ballooned up only till its start_target_mem and seems to disobey the static max. For e.g If I start a CentOS6 DomU with 4GB RAM then ballooning works fine between 256MB to 4GB but it cant go beyond 4GB though it has static max as 16GB. I can confirm same issue on XCP1.1, so it might be something only with CentOS6. - RJ