Le 2015-03-18 11:18, Omer Frenkel a écrit :
----- Original Message -----
From: "Guillaume Penin" <guilla...@onlineacid.com>
To: users@ovirt.org
Sent: Monday, March 16, 2015 10:34:54 PM
Subject: [ovirt-users] Ovirt resilience policy / HA
Hi all,
I'm building a test ovirt (3.5.1) infrastructure, based on 3 ovirt
nodes
and 1 ovirt engine.
Everything runs (almost) fine, but i don't exactly understand the
interaction between resilience policy (Cluster) and HA (VM).
=> What I understand, in case of host failure :
- Setting resilience policy to :
- Migrate Virtual Machines => All VMs (HA and non HA) will be
started on another host.
- Migrate only Highly Available Virtual Machines => HA VMs only
will
be started on another host.
- Do Not Migrate Virtual Machines => HA and non HA VMs won't be
started on another host.
=> In practice :
- No matter what parameter i use in resilience policy, HA VMs
only
will be started on another host in case of a host failure.
Is this the expected behaviour ? Am I misunderstanding the way it
works
?
there are 2 types of host failure:
1 - power/network/vdsm service.. - these leads to a state where engine
and host cannot communicate, host will move to 'non-responsive' and
will be fenced (power mgmt action)
in this case, only HA vms will be restarted, once the engine is sure it
is safe.
2 - software issues like storage connectivity - in this case, engine
can communicate with the host, and decide it is not fulfilling the
cluster/dc requirements
the host will move to 'not operational' then the engine will
live-migrate (not restart) vms according to your choice of resilience
policy
so what did you do when you tested 'host failure'?
according to your question i assume number 1, and this is what you got
let me know if it helps
Omer.
Hi Omer,
Indeed, I only tested the "Non responsive" scenario with a power
failure. The host was fenced and only HA VMs were restarted which was,
as you said, the correct behaviour in this case.
I've just tested the "Not operational" scenario by "ifdowning" a network
interface. Resilience policy was configured to "Migrate Virtual
Machines" and as expected, all VMs have been migrated to another host.
Thank you very much for that clarification.
Kind regards,
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