moving to ON_QA since this is on errata for async - https://errata.devel.redhat.com/errata/details/15420

it is impossible to verify using real HW as we do not have 2TB host.

we first check that the value pass as str instead of int from vdsm to engine.
changing the /usr/share/vdsm/libvirtvm.py (adding "max_mem = 2147483648")

    def _getBalloonInfo(self):
        for dev in self.conf['devices']:
            if dev['type'] == vm.BALLOON_DEVICES and \
                                  dev['specParams']['model'] != 'none':
                max_mem = int(self.conf.get('memSize')) * 1024
                max_mem = 2147483648 
                cur_mem = dev.get('target', max_mem)
                return {'balloon_max': str(max_mem), 'balloon_cur': str(cur_mem)}
        return {}

no xml-rpc error appears in engine.log


we then tried to simulate 2TB host by adding "caps['memSize'] = '2097152'" to the /usr/share/vdsm/caps.py

    caps['memSize'] = str(utils.readMemInfo()['MemTotal'] / 1024)
    caps['memSize'] = '2097152'

failed becuase of libvirt with below error - 
2013-08-13 11:59:44.034+0000: 2895: error : qemuProcessWaitForMonitor:1767 : internal error process exited while connecting to monitor: Failed to allocate 2199023255552 B: Cannot allocate memory


as there is no other way to verify, marking as verified using is19.2 based on above.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-1158.html