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 on POWER (new: little endian!) is not supported.
Also, since SUSE Linux Enterprise 15 is 64-bit only, upgrades from any 32-bit SUSE Linux Enterprise 11 systems to SUSE Linux Enterprise 15 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 safest upgrade path. In some cases it is supported to skip 1 or 2 Service Packs when upgrading. However, we recommend to not skip any Service Pack.
NOTE: Upgrading Major Releases
We recommend to do a fresh install when upgrading to a new Major Release, for example from SUSE Linux Enterprise 11 to SUSE Linux Enterprise 12.
There is no supported direct migration path to SUSE Linux Enterprise 15. We recommend a fresh installation in this case.
There is no supported direct migration path to SUSE Linux Enterprise 15. You need at least SLE 11 SP4 before you can proceed to SLE 15.
If you cannot do a fresh install, first upgrade your installed SLE 11 Service Pack to SLE 11 SP4. These steps are described in the SUSE Linux Enterprise 11 Deployment Guide.
Upgrading from SLE 11 SP4 is only supported via an offline upgrade. Refer to Section 1.2, Online and Offline Upgrade for details.
A direct upgrade from SLE 12 GA / SP1 / SP2 to SLE 15 is not supported. You need to upgrade to SLE 12 SP3 first.
Upgrading from SUSE Linux Enterprise 12 SP3 is only supported via an offline upgrade. Refer to Section 1.2, Online and Offline Upgrade for details.
Migrating from openSUSE Leap 15 is supported. See Section 5.9, Migrate from openSUSE Leap to SUSE Linux Enterprise Server. Only the server installation of Leap is supported for migration.
Figure 1-1 Overview of Shortest Upgrade Paths