title: Regarding XenAPI Memory Issue
body: <p>I am developing a small client application for monitoring XenServer using XenAPI provided by citrix. I am able to get all the values(cpu,n/w read,n/w write, diskread,diskwrite...) but facing the below issue. </p>
  
  <p>Can anybody please help me out in getting the memory (total,free,used) usage for the VM's present in the Xenserver using XenAPI. I tried the above by using <strong>VM_guest_metrics</strong> api call of VM, but its giving me the empty results. Please help me in this regard.</p>
  
  <p>I have taken SDK(XenAPI) from the below link</p>
  
  <p><a href="http://community.citrix.com/display/xs/Download+SDKs" rel="nofollow">http://community.citrix.com/display/xs/Download+SDKs</a></p>
  
  <p>Thanks in Advance for your help.</p>