Charles,
I reviewed the link, many components, appears complicated.
Why no 5250, that could be a show stopper?
Establishing a highly available SAP landscape requires removing any single points of failure (SPoF). To this end, it is convenient to conceptually separate the SAP landscape into components called resources. Each resource is a required component and must be redundant. Some components like application servers can simply exist in multiple. Other components, such as the database or file system, exist either as a clustered or switchable resource. A highly available SAP environment relies on the cluster services of the underlying operating system upon which it runs. On IBM i, the cluster services are provided by PowerHA SystemMirror for i. The redundant switchable resources in the SAP environment are controlled by PowerHA SystemMirror for i.
Using the new high availability characteristics of SAP and PowerHA SystemMirror for i, it is possible to create a highly available SAP environment which does not require the applications to end during a planned or unplanned outage.
The high availability solution described conceptually in this paper and in more detail in SAP note 1635602 separates the data and application components of the SAP environment across IBM i partitions and SAP instances to eliminate SPoF within the runtime environment.
For the data component, the SAP database exists in an IASP on an IBM i node. One of the PowerHA SystemMirror for i replication technologies is used to replicate the database to a second node. This provides the capability to switch between the primary and backup node.
Application high availability with PowerHA SystemMirror for i is achieved by implementing the SAP Central Services (SCS/ASCS) instance and the corresponding enqueue replication server (ERS) instance in two IBM i nodes, one node designated as the primary SCS/ASCS and the other as the backup. The SCS/ASCS runs on the current primary node, the ERS runs on the current backup node.
When combined with redundant SCS/ASCS instances, multiple remote SAP application server instances inherently provide application server redundancy. Multiple instances also provide application high availability during kernel updates. In figure 6, multiple application servers are configured, and login groups managed by SAP central services could be used to assign users to a defined set of application servers.
Paul
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles Wilt
Sent: Monday, October 01, 2018 6:25 PM
To: Midrange Systems Technical Discussion
Subject: Re: HA load balancing solution
So you want a IBM i cluster....
The functionality has been in the OS for a while now...
Your app would have to be designed to support it..and 5250 isn't going to
cut it.
Take a look at the SAP on i HA doc...
http://www-03.ibm.com/support/techdocs/atsmastr.nsf/5cb5ed706d254a8186256c71006d2e0a/7d18ff197d5468e186257a1c005c6a10/$file/ha%20options%20for%20sap%20using%20powerha.doc
Charles
On Mon, Oct 1, 2018 at 1:07 PM Steinmetz, Paul <PSteinmetz@xxxxxxxxxx>
wrote:
Anyone in the group running an HA load balancing solution?
I've heard of one vendor now offering this.
With this solution, there is no failover.
Two (or more) LPARs share the active load.
If one LPAR goes down for maintenance, (planned or unplanned) the other
LPAR continues to keep all apps running.
Not all applications (IBM and/or 3rd party) may support this, however?
Thank You
_____
Paul Steinmetz
IBM i Systems Administrator
Pencor Services, Inc.
462 Delaware Ave
Palmerton Pa 18071
610-826-9117 work
610-826-9188 fax
610-349-0913 cell
610-377-6012 home
psteinmetz@xxxxxxxxxx
http://www.pencor.com/
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