[Pacemaker] starting a xen-domU depending on available hardware-resources using SysInfo-RA

[Sascha Reimann]

howdy!

I'm trying to configure a resource (xen-domU) that could start on 2 
nodes (preferred on node server01):

primitive v01 ocf:heartbeat:Xen \
	params xmfile="/etc/xen/conf.d/v01.cfg" allow-migrate="true"
location loc-v01p v01 200: server01
location loc-v01s v01 100: server02

That's working fine so far, but I want to ensure that there's enough 
hardwareresources available on server01, so I've set up a modified 
SysInfo-RA to put the ram_total and ram_free values of xen (xm info|awk 
'/free_memory/ {print $3}') to the statusinformation of the CIB:

server01:~$ cibadmin -Q -o status|grep status-server01-ram
<nvpair id="status-server01-ram_total" name="ram_total" value="8191"/>
<nvpair id="status-server01-ram_free" name="ram_free" value="2000"/>

This is working fine, too. BUT:

When I create a rule like the one below, the xen-domU keeps restarting 
(or moving to server02 where the same happens), which is correct since 
the SysInfo-RA updates the statusinformation to value="0" after a start 
and back to value="2000" after a stop in this example.

location loc-resv01 v01 \
	rule $id="loc-resv01-rule" -inf: ram_free lt 2000

Can anybody help?