On 09/04/2014 01:51 PM, Juan José Pavlik Salles wrote:
Hi Jay, I do agree about 10% being too much memory in big nodes, but right now we are using small ones (too small if you ask). These new nodes are 16GB so if I reserve 4 Gb for the dom0 I'd be loosing 25% of the available RAM. I was thinking about something like: if you have got less than 32GB give 10% of it to the dom0 and If you have got more than 32GB go with 4GB for the dom0. Maybe different environments will need different rules, but this should work in most standar deployments I'd say. Jay, you mentioned that big nodes running many VMs don't neet more than 4GB of dedicated RAM, haven't you ever had any swapping situation in that kind of scenarios?
One more thing of note... if you have a lot of custom host or IDS monitoring or custom host applications running, you may want to increase the host RAM. By "custom" I mean anything other than Nagios/Zabbix/Ganglia-type stuff, which tend to be pretty low-memory daemons...
Do some investigation of a sample packed and sparse compute node and adjust as you see fit.
Best, -jay _______________________________________________ OpenStack-operators mailing list [email protected] http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
