[ovirt-users] Max amount of datacenters per ovirt engine

[Martin Sivak]

> @awels: to add another layer of indirection via a dedicated
> hosted-engine per outlet seems a little much. we are talking about 500 *
> 4GB RAM at least in this example, so 2 TB RAM just for management
> purposes, if you follow engine hardware recommendations?

I would not go that far. Creating zones per continent (for example)
might be enough.

> At least RHEV states in the documentation you support up to 200 hosts
> per cluster alone.

The default configuration seems to only allow 250 hosts per datacenter.

# engine-config -g MaxNumberOfHostsInStoragePool
MaxNumberOfHostsInStoragePool: 250 version: general

--
Martin Sivak
SLA / oVirt

On Tue, Apr 26, 2016 at 4:03 PM, Sven Kieske <svenkieske at gmail.com> wrote:
> On 26.04.2016 14:46, Martin Sivak wrote:
>> I think that 1000 hosts per engine is a bit over what we recommend
>> (and support). The fact that all of them are going to be remote might
>> not be ideal either. The engine assumes the network connection to all
>> hosts is almost flawless and the necessary routing and distance to
>> your hosts might not play nice with (for example) the fencing logic.
>
> Hi,
>
> this seems a little surprising.
>
> At least RHEV states in the documentation you support up to 200 hosts
> per cluster alone.
>
> There are no documented maxima for clusters or datacenters though.
>
> @awels: to add another layer of indirection via a dedicated
> hosted-engine per outlet seems a little much. we are talking about 500 *
> 4GB RAM at least in this example, so 2 TB RAM just for management
> purposes, if you follow engine hardware recommendations?
>
> But I agree, ovirt does not handle unstable or remote connections that
> well, so you might be better of with hundredths of remote engines, but
> it seems to be a nightmare to manage, even if you automate everything.
>
> My personal experience is, that ovirt does scale at least until about
> 30-50 DCs managed by a single engine, but that setup was also on a LAN
> (but I would say it could scale well beyond these numbers, at least on a
> LAN).
>
> HTH
>
> Sven
>
>
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