Hi, Currently we are unable to send long values between engine and vdsm due to xmlrpc limitation. There is an extension i8 for xmlrpc which enables 64bit numerical values (long) but we can't use it due to compatibility reasons. To workaround this limitation people cast long to string before sending it to the other side. I came up with engine and vdsm patches [1] to make this type conversion in single place. Jsonrpc supports long marshalling so by having above patches we can start to use long types without worrying about type conversion. Please let me know what do you think about it and whether there are any reasons why we should not have this changes in 3.6. Thanks, Piotr [1] http://gerrit.ovirt.org/#/q/status:open+topic:long-type-for-xmlrpc,n,z