We're using the (mostly) default scheduler settings. policy=1, MAX_HOST=1,
etc. My question came about because we had an empty host and instantiated a
number of VMs, and they all landed on the empty host. I have no doubt we have
something funky in our setup. I'll have to experiment with the scheduler more.
Thanks for the quick reply, Carlos.
On Aug 1, 2014, at 7:47 AM, Carlos Martín Sánchez
cmar...@opennebula.orgmailto:cmar...@opennebula.org wrote:
Hi,
On Thu, Jul 31, 2014 at 7:47 PM, Mark Devlin
mdev...@intelius.commailto:mdev...@intelius.com wrote:
Greetings,
Is there a way, using 4.4 or newer, for the scheduler to place VMs based on
their names?
No, but you can set a specific SCHED_REQUIREMENTS and _RANK in the Template [1]
Basically I want to spread a type of VM across as many hosts as possible, as
long as the hosts have available resources for it.
For example, if I have four hosts that have VMs and one that's empty, I don't
want the five (web1-web5) VMs I'm about about to instantiate to all end up on
that empty host. I want one on each host. However, if I start three more
(web6-web8), it should place based on available resources.
Hopefully that makes sense. Thank you
-Mark
That's how the scheduler works by default [2]. The policy is Striping, and
MAX_HOST is set to 1. The striping policy will try to send the VMs to the host
with less running VMs, but because of max_host = 1, only one VM will be sent to
the empty host in that scheduling cycle.
If you change the default policy, use SCHED_RANK = - RUNNING_VMS in your
Template.
Regards
[1]
http://docs.opennebula.org/4.6/user/references/template.html#placement-section
[2] http://docs.opennebula.org/4.6/administration/references/schg.html
--
Carlos Martín, MSc
Project Engineer
OpenNebula - Flexible Enterprise Cloud Made Simple
www.OpenNebula.orghttp://www.opennebula.org/ |
cmar...@opennebula.orgmailto:cmar...@opennebula.org |
@OpenNebulahttp://twitter.com/opennebulamailto:cmar...@opennebula.org
___
Users mailing list
Users@lists.opennebula.org
http://lists.opennebula.org/listinfo.cgi/users-opennebula.org