Hi,
We were actually evaluating Pacemaker based hosted engine and talking
to Pacemaker developers, but we hit couple of show stoppers:
- Pacemaker supports limited set of nodes in the default setup (16
iirc, extensible using some kind of relays)
- It uses network based synchronization and requires very low latency
network (we can't guarantee that when migrations are in progress for
example) - the rest of oVirt currently uses storage based
synchronization, so we are in a different world here
- We would basically have to rewrite / duplicate most of the hosted
engine code we already have to get the same scheduling logic (load
penalization, gateway checks, ...)
We decided that rewriting code for no clear benefit was not productive
and stayed with the current hosted engine instead.
Martin
On Wed, Jan 4, 2017 at 12:33 PM, Pavel Gashev <Pax(a)acronis.com> wrote:
It's interesting, I have an opposite opinion. I don’t see why
oVirt
reinvents its own HA instead of using Pacemaker. And it’s not old, it’s
mature ;)
I my case, I had no option to setup Hosted Engine since migration to oVirt
required storage rearrangement. Now I have to run HA oVirt VM using
Pacemaker + DRBD. Works great.
From: <users-bounces(a)ovirt.org> on behalf of Fernando Frediani
<fernando.frediani(a)upx.com.br>
Date: Tuesday 3 January 2017 at 15:38
To: "users(a)ovirt.org" <users(a)ovirt.org>
Subject: Re: [ovirt-users] How to execute Virsh command after ovirt
installation ?
Honestlly I don't see why in 2017 people still using the old DRBD +
Pacemaker solution for virtualization stuff.
On 03/01/2017 10:35, TranceWorldLogic . wrote:
Thanks, I agree bad idea to execute virsh command without knowing vdsm and
engine.
Is their any plan in ovirt to support drbd + Pacemaker ?
On Tue, Jan 3, 2017 at 4:29 PM, Michal Skrivanek
<michal.skrivanek(a)redhat.com> wrote:
On 3 Jan 2017, at 11:55, Nathanaël Blanchet <blanchet(a)abes.fr> wrote:
except for quickly get RO informations like "virsh capabilities".
When you come from libvirt and you know what to do, you might not want to
find/read a dedicated documentation for such a little query.
yes, sure, for read-only
but for any modification, no matter how minimal, it’s almost always needed
to inform vdsm/engine to know about it to prevent corner cases,
misdetections, etc...
Le 03/01/2017 à 11:19, Michal Skrivanek a écrit :
On 3 Jan 2017, at 11:15, Nathanaël Blanchet <blanchet(a)abes.fr> wrote:
Use at your own risks:
vdsm@ovirt:shibboleth
But, you may unsynchronize your host HW with engine database.
it is almost always a bad idea to do that
hooks are exactly for the cases like below, just in a cleaner way
Le 03/01/2017 à 11:09, Yaniv Dary a écrit :
It is preferable you use VDSM hooks to add devices to VMs.
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306
8272306
Email: ydary(a)redhat.com
IRC : ydary
On Tue, Jan 3, 2017 at 10:58 AM, TranceWorldLogic .
<tranceworldlogic(a)gmail.com> wrote:
Hi Joop,
I want to add drdb device in vm instance hence would like to execute virsh
command.
Is it possible ?
Thanks,
~Rohit
On Tue, Jan 3, 2017 at 1:26 PM, jvandewege <jvandewege(a)nieuwland.nl> wrote:
On 3-1-2017 8:32, TranceWorldLogic . wrote:
> Hi,
>
> I tried execution below virsh command after ovirt installation.
> but it requesting username and password.
>
> ~# virsh list --all
> Please enter your authentication name:
>
> Please let me know which username and password I have to provide ?
If you only need read access then you need to supply -r as an additional
argument.
Why do you need virsh because that will only give you the info on that
host, using ovirt-shell gives you the info for all hosts.
Joop
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