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Former Member
Nov 19, 2012 at 07:48 AM

PI-Java only installtion on HA enviornment

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Hi All,

We are installing HA enviornment for PI 7.31 ( Java only) on IBM HACMP.

The doubt is regaring the exact step and location to of installing the ERS.

The HA setup is as follow:

there are 2 physical server on the cluster envirnmrnt in Active-Passive mode , with one Virtual Host name assign to it.

The sapinst says the following :

Description:

Installs the central services instance for Java (SCS instance).

First step in installing a high-availability (HA) SAP NetWeaver 7.3 including Enhancement Package 1 Java system

You must install the SCS instance on a shared disk.

Make sure that you assigned a virtual host name using command line option SAPINST_USE_HOSTNAME when you started the installer to execute this option.

With this option you can also install the required enqueue replication server instance (ERS instance) for the SCS instance:

  1. 1.)Only select the Install ERS for this Instance checkbox on the subsequent SCS Instance screen if you want the ERS instance to be installed on the same physical host as the SCS instance. You then have to assign a virtual host name to the ERS instance using the Host Name for the ERS Instance field. In this case, you must not run installation option Enqueue Replication Server Instance after you have finished this installation option.

  1. 2.)If you want to install the ERS instance on a physical host that is different from the installation host of the SCS instance, do not select the Install ERS for this Instance checkbox. In this case, you have to run installation option Enqueue Replication Server Instance after you have finished this installation option.

SCS Instance

The SCS instance is the main point of communication and synchronization for the Java application server instances. It consists of the message server and the enqueue server for the Java stack.

ERS Instance

The ERS instance contains the replication table, which is a copy of the lock table.

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Where as the installation guides says that it needs to be installed on both the physical host on local disk.

Any idea how the actual set will be .

Br

Anthony