Re: [ovirt-users] [ovirt 3.6] Logical network not working

[Edward Haas]

On Fri, Sep 9, 2016 at 2:05 PM, Luca 'remix_tj' Lorenzetto <
lorenzetto.l...@gmail.com> wrote:

> On Fri, Sep 9, 2016 at 12:49 PM, Edward Haas  wrote:
>
> >
> >
> > Can you please elaborate on what address you assigned to the VM and
> > to what address did you tried to ping?
>
>
> I can explain more how is the network setup:
>
> i have a vlan with vlan id 828. The addressing assigned to this vlan
> is 10.5.28.0/22.
> Gateway is 10.5.31.254
>
> My VM has ip 10.5.28.211 and is pinging the default gateway (10.5.31.254).
>
> Logical network "Development" is connected to the interface eno5 and
> has no ip address.
>
> What i get on the vm is Destination Host Unreachable, and arp -an
> shows 10.5.31.254 as incomplete.
>
> It's a clear sign of network isolation.
>
> Luca
>
>
This means you have a trunk set on the switch port connected to eno5, right?
I would recommend setting an IP address to the 'Development' network in the
same subnet
so you could check if your VM can reach it and if you can reach from it to
the router.
Then you will have a better understanding where is the problem.
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Re: [ovirt-users] Minimal resources for Engine

[Yedidyah Bar David]

On Fri, Sep 9, 2016 at 10:30 PM, Fernando Frediani
 wrote:
> Hi there.
>
> I was reading this interesting URL someone just sent a while ago regarding
> hyperconvergence topic
> (https://www.ovirt.org/blog/2016/08/up-and-running-with-ovirt-4-0-and-gluster-storage/)
> and found the point about the optimal amount of resources for a Engine -
> 16GB of RAM.
>
> I just wanted to ask what component or feature eats up so much memory for
> that amount be the recommended. Or is it just in a hyperconverged scenario ?

The engine itself needs quite a lot of memory.

>
> Are there any components that can be optional that can reduce the amount of
> memory needed to run the Engine ?

DWH and postgresql need quite a lot too.

In principle you can run each of: engine, dwh, engine's db, dwh's db
on its own machine, total of 4 machines.

Also please note that the "minimum" according to engine-setup (and
elsewhere) is 4GB, and that this greatly depends on your setup's size
and use patterns/flow (e.g. how often do you ask the engine to do
something compared to the engine most of the time just monitors stuff
etc).

>
> Also with if the Data Warehouse runs in a separate host what would be the
> reduction in resources consumption, specially memory ?

I am not aware of actual semi-accurate measurements done recently,
and I guess most people don't bother because memory is cheap these
days.

Personally I usually run my engines on VMs with 2-4GB RAM, and
never had problems. These are used only for testing/development
and not for real work. I am also aware of engines on machines
with 8GB RAM, managing 100-200 VMs with no problems.

See also:

https://bugzilla.redhat.com/show_bug.cgi?id=1185411
https://bugzilla.redhat.com/show_bug.cgi?id=1329119

Bottom line:

If you don't care much and have a few tens/low hundreds VMs,
just use 8-16GB.

If you do care, and/or have much larger setups, either separate
the services to different machines, or actually do some tests
(and publish the results!), or both.

Hope this helps,
-- 
Didi
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