Re: IBM i 7.4 and IBM i Portfolio give strong foundation for continuing innovation

[Vernon Hamberg <vhamberg@xxxxxxxxxxxxxxx>]

Stefan

I think you're right about extreme needs - all along, as I've seen this 
feature developing, it has been in the context of 2 main nodes.

I just googled "quorum data" - it seems to be an industry term used in 
distributed database systems. New terms for some of us (myself!!) to 
learn, I see!!

Regards
Vern

On 4/23/2019 1:37 PM, Stefan Tageson wrote:
> Thank You Vern,
>
> This is the text that got me start wondering: (Db2 Mirror pdf page 23)
> "Quorum data
> Cluster-wide data that is stored on all the nodes in the cluster. It is used by Db2 Mirror to verify
> status and information about the nodes when they are unable to communicate.
>
> Quorum server
> A third node added to the cluster to ensure the reliability of quorum data."
>
> Most likely the Quorum server is optional for extreme requirements.
>
> Best regards
>
> stefan.tageson@xxxxxxxx
> M +46 732 369934
>
>
> Sensitivity: Internal
>
> -----Original Message-----
> From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Vernon Hamberg
> Sent: den 23 april 2019 19:38
> To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
> Subject: Re: IBM i 7.4 and IBM i Portfolio give strong foundation for continuing innovation
>
> Stefan
>
> You need 2 nodes - probably can be partitions.
>
> I don't know if I would call it a cluster - is that a term IBM used in the Db2 Mirror documentation?
>
> The limit on the connection between nodes was stated as between 100 and
> 200 meters in a presentation last week. This is a limitation of the RoCE protocol, as I understand it.
>
> So this is a local data center setup only - not DR for sure - the Knowledge Center pages mention that DR products work along with Db2 Mirror.
>
> Very exciting
> Vern