Before you perform any migration, read Section 3.0, Preparing the Upgrade.
IMPORTANT: Cross-architecture Upgrades Are Not Supported
Cross-architecture upgrades, such as upgrading from a 32-bit version of SUSE Linux Enterprise Server to the 64-bit version, or upgrading from big endian to little endian are not supported!
Specifically, SLE 11 on POWER (big endian) to SLE 15 SP1 on POWER (new: little endian!) is not supported.
Also, since SUSE Linux Enterprise 15 SP1 is 64-bit only, upgrades from any 32-bit SUSE Linux Enterprise 11 systems to SUSE Linux Enterprise 15 SP1 and later are not supported.
To make a cross-architecture upgrade, you need to perform a new installation.
NOTE: Skipping Service Packs
Consecutively installing all Service Packs is the easiest upgrade path. For the SUSE Linux Enterprise 15 product line (GA and the following Service Packs) it is supported to skip one service pack when upgrading. For example, it is supported to upgrade from SLE 15 GA to 15 SP2 or from SLE 15 SP1 to 15 SP3.
NOTE: Upgrading Major Releases
We recommend to do a fresh install when upgrading to a new Major Release, for example from SUSE Linux Enterprise 12 to SUSE Linux Enterprise 15.
Figure 1-1 Overview of Supported Upgrade Paths
Upgrading from SLES 12 SP2 or older service packs directly is not supported. You need at least SLES 11 SP4 before you can proceed to SLES 15 SP1.
If you cannot do a fresh installation, first upgrade your installed SLES 11 service pack to SLES 11 SP4. This upgrade is described in the SLES 11 Deployment Guide.
Upgrading from SLES 11 SP4 is only supported via an offline upgrade. Refer to Section 1.2, Online and Offline Upgrade for details.
Upgrading from SLES 12 SP2 or older service packs directly is not supported. You need at least SLES 12 SP3 before you can proceed to SLES 15 SP1.
If you cannot do a fresh installation, first upgrade your installed SLES 12 service pack to SLES 12 SP3. This upgrade is described in the SLES 12 Deployment Guide .
Upgrading from SLES 12 SP3 / SP4 is only supported via an offline upgrade. Refer to Section 1.2, Online and Offline Upgrade for details.
Upgrading from SLES 15 is supported both online and offline. Refer to the following for details:
Upgrading from openSUSE Leap 15 is supported. See Section 5.9, Upgrading from openSUSE Leap to SUSE Linux Enterprise Server. Only the server installation of Leap is supported for an upgrade.