xi.addNewChild("volume", volName);
NaServer s = null;
String volumeState = null;
try {
s = getServer(serverIp, userName, password);
NaElement xo = s.invokeElem(xi);
List volList = xo.getChildByName("volumes").getChildren();
Iterator volIter = volList.iterator();
while(volIter.hasNext()){
NaElement volInfo=(NaElement)volIter.next();
availableSize = volInfo.getChildLongValue("size-available", -1);