Sometimes OS will cache the date from nfs mounts which will cause to host take not updated meta data.

Scenario:
Two hosts,VM is running on host1.
Blocking connection to the storage on host1 causes to failover and VM starts on host2. After connection resumed ha agent on the second host shows that the score on the first host is 2000 while the first host thinks it's 1000 and tries to start VM.

Here is the agent.log output file on the second host:
-----------------------------------------------------
MainThread::INFO::2013-10-01 17:41:41,888::hosted_engine::608::HostedEngine::(_collect_all_host_stats) Host purple-vds2.qa.lab.tlv.redhat.com (id 1) metadata updated
MainThread::INFO::2013-10-01 17:41:41,889::hosted_engine::613::HostedEngine::(_collect_all_host_stats) Host purple-vds2.qa.lab.tlv.redhat.com (id 1): {'last-update-host-ts': 1380638497, 'last-update-local-ts': 1380638501.888829, 'hostname': 'purple-vds2.qa.lab.tlv.redhat.com', 'alive': True, 'engine-status': 'vm-down', 'score': 2400, 'first-update': False}
MainThread::INFO::2013-10-01 17:41:41,889::hosted_engine::608::HostedEngine::(_collect_all_host_stats) Host purple-vds3.qa.lab.tlv.redhat.com (id 2) metadata updated
MainThread::INFO::2013-10-01 17:41:41,889::hosted_engine::613::HostedEngine::(_collect_all_host_stats) Host purple-vds3.qa.lab.tlv.redhat.com (id 2): {'last-update-host-ts': 1380638501, 'last-update-local-ts': 1380638501.888829, 'hostname': 'purple-vds3.qa.lab.tlv.redhat.com', 'alive': True, 'engine-status': 'vm-up good-health-status', 'score': 2000, 'first-update': False}

And here is the output of vm-status from the first host:
---------------------------------------------------------
--== Host 1 status ==--

Hostname                           : purple-vds2.qa.lab.tlv.redhat.com
Host ID                            : 1
Engine status                      : vm-down
Score                              : 2400
Host timestamp                     : 1380638671
Extra metadata                     :
	metadata_parse_version=1
	metadata_feature_version=1
	timestamp=1380638671 (Tue Oct  1 17:44:31 2013)
	host-id=1
	score=2400
	bridge=True
	cpu-load=0.035
	engine-health=vm-down
	gateway=True
	mem-free=9408
	mem-load=0.000506072874494


--== Host 2 status ==--

Hostname                           : purple-vds3.qa.lab.tlv.redhat.com
Host ID                            : 2
Engine status                      : vm-up good-health-status
Score                              : 1000
Host timestamp                     : 1380633444
Extra metadata                     :
	metadata_parse_version=1
	metadata_feature_version=1
	timestamp=1380633444 (Tue Oct  1 16:17:24 2013)
	host-id=2
	score=1000
	bridge=True
	cpu-load=0.19
	engine-health=vm-up good-health-status
	gateway=False
	mem-free=1432
	mem-load=0.0164405010438

As you can see second hosts shows that the first host's score is 2400 while the first host thinks its score is 1000.