[PVE-User] Cross datacenter HA

Eneko Lacunza elacunza at binovo.es
Thu Dec 29 11:38:59 CET 2016


Hi Emmanuel,

El 29/12/16 a las 11:23, Emmanuel Kasper escribió:
> On 12/20/2016 12:43 PM, Eneko Lacunza wrote:
>> Hi,
>>
>> Sure, I meant datacenter, sorry; I didn't realize the acronym was in
>> spanish :)
>>
>> So let me rewrite the question :-)
>>
>> We are doing a preliminary study for a VMWare installation migration to
>> Proxmox (14 hosts total, 7 in each datacenter).
>>
>> Currently, customer has 2 datacenters in HA, so that if the main
>> datacenter goes down, all VMs are restarted in backup datacenter.
>> Storage is SAN and storage data is replicated using SAN capabilities.
>>
>> What can be done with Proxmox to get the same HA capabilities? Would it
>> be better to have 2 independent clusters, one in each datacenter, or a
>> unique cluster with two failure domains?
>>
>> I have some worries about quorum for a single-cluster, but I don't think
>> Proxmox has anything prepared for cross-cluster HA?
>>
>> Thanks a lot
>> Eneko
> Proxmox clustering uses Corosync for cluster connection, and corosync
> needs a low latency link between nodes, in the 5 ms range.
> If you have a direct *high reliable* fiber link between your two DC /
> CPD this might work.  See this latency calculator
> http://wintelguy.com/wanlat.html
> In that case you could build a multi site cluster.
>
> You could also set up HA beween your two DCs at the application level,
> for instance using a bunch of stateless applications servers connecting
> to a DB, where you want only need to setup HA at the DB level (Hint:
> streaming replication if using PostgreSQL)
Thanks for the hints!

Eneko

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