Conversion from non-cluster to cluster environment MSCS

[Former Member]

What are the steps to convert a non-cluster environment to a clustered environment on a ECC 6.0 Windows/Oracle 10g platform.

Right now we have 2 servers the DB/CI and an the dialog instance. I understand that apart from installing the MS ClusterService, we will also need to configure OracleFailsafe.

My question is how do i move to a cluster environment, is it via a homogeneous system copy, i.e export DB, uninstall existing SAP/Oracle instance followed by reinstallation of SCS, node1/2 preparation (MSCS & Failsafe) and DB import ?

What is best method to minimize downtime.

[Former Member]

Hi Thom,

The best way to minimize the downtime is to move your production server to a standby machine and allow the users to access the standby database. Do a backup and restore to your standby database machine.

Usually it takes 2 days to convert your standalone machine to a clustered environment, this includes testing all fail over possibilities.

Once you migrate your server, uninstall SAP frm ur old production server, install Oracle fail safe on a local disk. On your node B install oracle and Oracle fail safe on local disk with same OracleHome name.

You have to install the following instances:

ASCS

SCS

DB Instance

CI instance

ERS

Configure Node A

Configure Node B

Configure OFS

Once you have done, move your standby database to your cluster production server machine. Read installation guide, it addresses all the points.

Revert for any clarifications

Regards,

Balakrishnan

[Former Member]

Hi!

It can give some work but you don't have to re-install the whole system. First of all... download the Instalation guide and read the cluster installation part. then...

1. install oracle software on second node with the same patch, if your not certain about implemented patch apply the latest on DB (test it on DEV and QAS first)

2. install failsafe... follow the instalation guide

3. test oracle failover

4. SAP installation in cluster according to installation guide. I think the easiest way is to delete the SAP CI instance and install it as a cluster. But nevertheless you should review the installation guide and check in sapinst. bear in mind that you should run sapinst with parameter SAPINST_USE_HOSTNAME.

Depending on your hardware you can take one day (8h-12h) to do this.

Cheers,

[Former Member]

homogeneous copy using DB copy method can reduce a lot of downtime.

Thanks

Govind