Revert existing Db2 database products to a previous fix pack level (Linux and Unix)

After installing a mod pack or fix pack, you can revert to a previous fix pack or the GA level of the Db2 database product.

On Linux® and UNIX operating systems, you can go back to an earlier fix pack or the GA level.

On Windows operating systems, you cannot go back to a previous fix pack or the GA level unless you uninstall the current fix pack, then install the previous level.

About this task

To revert to a previous fix pack on a non-Db2 pureScale® instance.

Procedure

For root installations:

Log on to the server with root user authority.
Extract the fix pack image you want to revert to.
Install the fix pack image using the installFixPack command with the -f level to force a level check bypass. Specify a different directory than the currently installed image you want to update using the -p option.
For example, if you currently have a Db2version 11.5.5 image on /opt/ibm/db2/V11.5.5 and are trying to revert back to version 11.5.4, run the following command:
```
<FP-image>./installFixPack -f level -b <current-installation-dir> -p <install-FP-dir>
```
Where FP-image is the fix pack image extracted, current-installation-dir is /opt/ibm/db2/V11.5.5, and install-FP-dir is /opt/ibm/db2/v11.5.4 in the example.
Update each instance by issuing the db2iupdt command with the -f level option to force a level check bypass. For example:
```
<install-FP-dir> ./db2iupdt -d -f level [-u fenced-ID] instance-name
```
Where install-FP-dir is /opt/ibm/db2/v11.5.4 in the example.
Verify that the instances are running the updated fix pack code by issuing the db2level command as the instance owner.