[Pacemaker] Making Virtual Domain utilization dynamic

[Michael Schwartzkopff]

Hi,

I picked up my old idea to make resouce utilizations dymanic and wrote the 
little patch for VirtualDomain to check CPU utilization every time the 
VirtualDomain is monitored:

--- /usr/lib/ocf/resource.d/heartbeat/VirtualDomain     2013-01-06 
23:50:54.000000000 +0100                                                          
+++ /usr/lib/ocf/resource.d/misch/VirtualDomain 2013-04-26 22:09:18.377784406 
+0200                                                                  
@@ -404,6 +404,12 @@
            fi
        done
     fi
+
+    if [ -x /usr/bin/virt-top ]; then
+      CPU_TICKS=$(/usr/bin/virt-top -n 2 -d 5 --stream | grep $DOMAIN_NAME | 
tail -1 | awk '{printf "%.0f",$7}')
+      /usr/sbin/crm_resource -r $OCF_RESOURCE_INSTANCE -z -p ticks -v 
$CPU_TICKS
+    fi
+    
     return ${rc}
 }

I choose the measure CPU ticks since it is more granular than plain CPU usage.

With this patch pacemaker updates the utilization of the resource every time 
it monitors the resource. Together with the placement-strategy="minimal" and 
live-migration you could do very cool things.

Especially if you think about an extended fencing system that is able to 
switch off unused nodes and turn on node as needed.

Comments are welcome.

-- 
Mit freundlichen Grüßen,

Michael Schwartzkopff

-- 
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