Weblogic 12c datasource odd behavior

Created a weblogic cluster with 2 members, and created two db datasources for the cluster.  While start both servers, there is always one datasource can't be found on a server. Error log as below:

####<Jan 6, 2015 8:34:19 PM PST> <Info> <JDBC> <wlserver> <weblogicserver> <[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1420605259151> <BEA-001177> <Creating data source connection pool named ORADS, URL = jdbc:oracle:thin:@oracledb:1521:dbname, Properties = user=gcduser;databaseName=dbname;serverName=oracledb;portnumber=1521;.>
####<Jan 6, 2015 8:34:19 PM PST> <Info> <Common> <wlserver> <weblogicserver> <[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1420605259792> <BEA-000626> <Free resources in pool "ORADS" will be tested every "120" seconds.>
####<Jan 6, 2015 8:36:46 PM PST> <Info> <JDBC> <wlserver> <weblogicserver> <[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1420605406141> <BEA-001508> <Destroying data source connection pool ORADS.>
####<Jan 6, 2015 8:36:46 PM PST> <Info> <JDBC> <wlserver> <weblogicserver> <[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1420605406141> <BEA-001155> <The following exception has occurred:

weblogic.common.ResourceException: Unknown Data Source ORADS
at weblogic.jdbc.common.internal.ConnectionPoolManager.shutdownConnectionPool(ConnectionPoolManager.java:630)
at weblogic.jdbc.common.internal.ConnectionPoolManager.shutdownAndDestroyPool(ConnectionPoolManager.java:602)
at weblogic.jdbc.common.internal.ConnectionPoolManager.shutdownAndDestroyPool(ConnectionPoolManager.java:533)
at weblogic.jdbc.module.JDBCModule.prepare(JDBCModule.java:330)
at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(ModuleListenerInvoker.java:100)
at weblogic.application.internal.flow.ModuleStateDriver$1.next(ModuleStateDriver.java:172)
at weblogic.application.internal.flow.ModuleStateDriver$1.next(ModuleStateDriver.java:167)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:35)
at weblogic.application.internal.flow.ModuleStateDriver.prepare(ModuleStateDriver.java:38)
at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:139)
at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:55)
at weblogic.application.internal.BaseDeployment$1.next(BaseDeployment.java:706)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:35)
at weblogic.application.internal.BaseDeployment.prepare(BaseDeployment.java:237)
at weblogic.application.internal.SingleModuleDeployment.prepare(SingleModuleDeployment.java:48)
at weblogic.application.internal.DeploymentStateChecker.prepare(DeploymentStateChecker.java:158)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.prepare(AppContainerInvoker.java:60)
at weblogic.deploy.internal.targetserver.SystemResourceDeployment.prepare(SystemResourceDeployment.java:66)
at weblogic.management.deploy.internal.DeploymentAdapter$1.doPrepare(DeploymentAdapter.java:39)
at weblogic.management.deploy.internal.DeploymentAdapter.prepare(DeploymentAdapter.java:191)
at weblogic.management.deploy.internal.AppTransition$1.transitionApp(AppTransition.java:21)
at weblogic.management.deploy.internal.ConfiguredDeployments.transitionApps(ConfiguredDeployments.java:240)
at weblogic.management.deploy.internal.ConfiguredDeployments.prepare(ConfiguredDeployments.java:165)
at weblogic.management.deploy.internal.ConfiguredDeployments.deploy(ConfiguredDeployments.java:122)
at weblogic.management.deploy.internal.DeploymentServerService.resume(DeploymentServerService.java:186)
at weblogic.management.deploy.internal.DeploymentServerService.start(DeploymentServerService.java:94)
at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)
>
####<Jan 6, 2015 8:36:46 PM PST> <Error> <Deployer> <wlserver> <weblogicserver> <[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1420605406144> <BEA-149205> <Failed to initialize the application "ORADS" due to error weblogic.application.ModuleException:
weblogic.application.ModuleException:
at weblogic.jdbc.module.JDBCModule.prepare(JDBCModule.java:337)
at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(ModuleListenerInvoker.java:100)
at weblogic.application.internal.flow.ModuleStateDriver$1.next(ModuleStateDriver.java:172)
at weblogic.application.internal.flow.ModuleStateDriver$1.next(ModuleStateDriver.java:167)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:35)
at weblogic.application.internal.flow.ModuleStateDriver.prepare(ModuleStateDriver.java:38)
at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:139)
at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:55)
at weblogic.application.internal.BaseDeployment$1.next(BaseDeployment.java:706)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:35)
at weblogic.application.internal.BaseDeployment.prepare(BaseDeployment.java:237)
at weblogic.application.internal.SingleModuleDeployment.prepare(SingleModuleDeployment.java:48)
at weblogic.application.internal.DeploymentStateChecker.prepare(DeploymentStateChecker.java:158)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.prepare(AppContainerInvoker.java:60)
at weblogic.deploy.internal.targetserver.SystemResourceDeployment.prepare(SystemResourceDeployment.java:66)
at weblogic.management.deploy.internal.DeploymentAdapter$1.doPrepare(DeploymentAdapter.java:39)
at weblogic.management.deploy.internal.DeploymentAdapter.prepare(DeploymentAdapter.java:191)
at weblogic.management.deploy.internal.AppTransition$1.transitionApp(AppTransition.java:21)
at weblogic.management.deploy.internal.ConfiguredDeployments.transitionApps(ConfiguredDeployments.java:240)
at weblogic.management.deploy.internal.ConfiguredDeployments.prepare(ConfiguredDeployments.java:165)
at weblogic.management.deploy.internal.ConfiguredDeployments.deploy(ConfiguredDeployments.java:122)
at weblogic.management.deploy.internal.DeploymentServerService.resume(DeploymentServerService.java:186)
at weblogic.management.deploy.internal.DeploymentServerService.start(DeploymentServerService.java:94)
at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)
Caused By: weblogic.common.ResourceException: weblogic.common.ResourceException: Could not create pool connection. The DBMS driver exception was: IO Error: Connection reset
at weblogic.jdbc.common.internal.ConnectionEnvFactory.createResource(ConnectionEnvFactory.java:288)
at weblogic.common.resourcepool.ResourcePoolImpl.makeResources(ResourcePoolImpl.java:1310)
at weblogic.common.resourcepool.ResourcePoolImpl.makeResources(ResourcePoolImpl.java:1227)
at weblogic.common.resourcepool.ResourcePoolImpl.start(ResourcePoolImpl.java:250)
at weblogic.jdbc.common.internal.ConnectionPool.doStart(ConnectionPool.java:1396)
at weblogic.jdbc.common.internal.ConnectionPool.start(ConnectionPool.java:187)
at weblogic.jdbc.common.internal.ConnectionPoolManager.createAndStartPool(ConnectionPoolManager.java:520)
at weblogic.jdbc.common.internal.ConnectionPoolManager.createAndStartPool(ConnectionPoolManager.java:442)
at weblogic.jdbc.module.JDBCModule.prepare(JDBCModule.java:288)
at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(ModuleListenerInvoker.java:100)
at weblogic.application.internal.flow.ModuleStateDriver$1.next(ModuleStateDriver.java:172)
at weblogic.application.internal.flow.ModuleStateDriver$1.next(ModuleStateDriver.java:167)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:35)
at weblogic.application.internal.flow.ModuleStateDriver.prepare(ModuleStateDriver.java:38)
at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:139)
at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:55)
at weblogic.application.internal.BaseDeployment$1.next(BaseDeployment.java:706)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:35)
at weblogic.application.internal.BaseDeployment.prepare(BaseDeployment.java:237)
at weblogic.application.internal.SingleModuleDeployment.prepare(SingleModuleDeployment.java:48)
at weblogic.application.internal.DeploymentStateChecker.prepare(DeploymentStateChecker.java:158)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.prepare(AppContainerInvoker.java:60)
at weblogic.deploy.internal.targetserver.SystemResourceDeployment.prepare(SystemResourceDeployment.java:66)
at weblogic.management.deploy.internal.DeploymentAdapter$1.doPrepare(DeploymentAdapter.java:39)
at weblogic.management.deploy.internal.DeploymentAdapter.prepare(DeploymentAdapter.java:191)
at weblogic.management.deploy.internal.AppTransition$1.transitionApp(AppTransition.java:21)
at weblogic.management.deploy.internal.ConfiguredDeployments.transitionApps(ConfiguredDeployments.java:240)
at weblogic.management.deploy.internal.ConfiguredDeployments.prepare(ConfiguredDeployments.java:165)
at weblogic.management.deploy.internal.ConfiguredDeployments.deploy(ConfiguredDeployments.java:122)
at weblogic.management.deploy.internal.DeploymentServerService.resume(DeploymentServerService.java:186)
at weblogic.management.deploy.internal.DeploymentServerService.start(DeploymentServerService.java:94)
at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)

Solution :
1. re-create two node (the original 2nd node was created by copy node-1 by template pack/unpacking)
2. start server by running command : ./startManagedWebLogic.sh Server2 domainServer:7001 (originally there was no domainServer:7001 appending)