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

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


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-----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