OS Migration AIX to Linux

[#1]

Hello Admins,

One of my customer want to migrate his data center, this migration also includes OS migration for SAP servers from AIX to Linux.

Current system : ECC 6.0, AIX 6.1 and Oracle 10.2, also it is Non Unicode system.

Target system : ECC 6.0, Linux (version is not yet decided) and Oracle 11.2 (which we will upgrade before migration on source system) and non unicode system.

Please suggest -

Which will be the best approach to follow for OS migration.?

Can we achieve this migration with lpar movement during data center migration.?

Is it mandatory to have OS/DB Migration certified consultant for such project and if one don't have that what can be the issues.?

I have read SAP note# 82478 - SAP system OS/DB migration, need some more inputs from your experience.

Thanks in advance.

Regards,

Ashish

[Former Member · Accepted solution]

Hello Ashish,

To expand on what Sharib has already mentioned.

1. You will have to perform a heterogeneous migration. AIX is big endian and Linux is little Endien. Filesystems don't come into the equation for your migration.

2. For OS/DB migrations your consultant must be OS/DB certified (TADM70 or later). If you don't use a certified consultant then you risk losing SAP support in the event of issues.

You have decided to upgrade your Oracle version before the migration. You could export from 10.2 DB and import into a 11.2 directly without having to upgrade your source DB. However, if you want to perform "like for like" tests before/after then you could upgrade before starting as you have planned.

You will find additional information at:

SAP OS/DB Migration Check | SAP Support Portal

Kind Regards,

Amerjit

[Former Member · Accepted solution]

Thank you for the valuable information.

Can you please help me understand on below approach,

I will take an oracle backup of current system (on AIX).

Then I will install SAP system on my Linux box where host name, SID, Instance no. everything will be kept same; And I will also make sure that Oracle SAPDATA files size will remain same.

After the installation,I will restore the database backup on newly installed system which is running on Linux.

I would like to know if this approach can work?

Please suggest.

Thanks,

Ashish

[Reagan · Accepted solution]

You cannot do a backup and restore of a database running on AIX to Linux. You need to do a heterogeneous system copy. This has been discussed numerous times before.

[Former Member · Accepted solution]

Hi Ashish,

I would suggest you to contact a OS/DB migration consultant so that you dont land yourself in trouble post migration.

Thanks,

Sharib

[S_Sriram · Accepted solution]

Hi Ashish

I think it's not possible to restore the Oracle DB in Linux (which is already backup on AIX). You have to follow the steps as per SAP Heterogeneous system copy method.

1. From Source system (That on AIX / Oracle 10.2) SAP Standard method System copy Export.

2. On target system (Linux / Oracle 10.2) import the same by SAP standard method

3. Upgrade the Database from 10.2 to 11.2

BR

SS