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How to upgrade SuSE 11 sp3 to sp4, and allow revert changes?

This is using SuSE Enterprise Server 11 with SP3. We wanted to upgrade to SP4. However, we also worry if the existing application and database may not work properly in SP4, and need to revert change. We have both the 11 with SP3 and 11 with SP4 ISO. I know that one way to start the upgrade is, booting the server with this SP4 ISO, and install until complete. After the system reboot, SP4 is there.

Any other method to upgrade? is better if the upgrade allows to revert back to SP3. Does "zypper" support upgrade?

Thanks in advance.

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David Favor

8/22/2022 - Mon