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Tried to verify the process of online migration from sles12 ga LTSS to sles12 sp3 via scc/proxyscc:

Note: so far we have to delete LTSS product and its repos before migration, otherwise there is no available migration target.

Steps:

1. Launch sles12 ga and register base product and LTSS product with given regcodes.
2. Perform fully patch

3. Remove LTSS product and its services and repos by following commands:

   zypper rm -t product SLES-LTSS
   zypper rs SUSE_Linux_Enterprise_Server_LTSS_12_x86_64

4a. Perform online migration by zypper migration via scc with following output:

Executing 'zypper  refresh'

Repository 'SLES12-12-0' is up to date.
Repository 'SLES12-Pool' is up to date.
Repository 'SLES12-Updates' is up to date.
All repositories have been refreshed.

Executing 'zypper  --no-refresh patch-check --updatestack-only'

Loading repository data...
Reading installed packages...
0 patches needed (0 security patches)

command 'zypper --no-refresh --non-interactive install --no-recommends -t product SLES-LTSS' failed
Can't install release package for registered product SLES-LTSS
SUSE::Connect::ZypperError: Product 'SLES-LTSS' not found.
Calling SUSEConnect rollback to make sure SCC is synchronized with the system state.
Available migrations:

    1 | SUSE Linux Enterprise Server 12 SP3 x86_64

    2 | SUSE Linux Enterprise Server 12 SP2 x86_64

    3 | SUSE Linux Enterprise Server 12 SP1 x86_64

[num/q]:

Above error shown and call rollback to sync scc with system, then able to show the migration target.

4b. Perform online migration by zypper migration via proxyscc with following output:

Executing 'zypper  refresh'

Repository 'SLES12-12-0' is up to date.
Repository 'SLES12-Pool' is up to date.
Repository 'SLES12-Updates' is up to date.
All repositories have been refreshed.

Executing 'zypper  --no-refresh patch-check --updatestack-only'

Loading repository data...
Reading installed packages...
0 patches needed (0 security patches)

command 'zypper --no-refresh --non-interactive install --no-recommends -t product SLES-LTSS' failed
Can't install release package for registered product SLES-LTSS
SUSE::Connect::ZypperError: Product 'SLES-LTSS' not found.
Calling SUSEConnect rollback to make sure SCC is synchronized with the system state.
command 'zypper --non-interactive --releasever 12 ref -f' failed
Can't determine the list of installed products: SUSE::Connect::ZypperError: Repository 'SLES12-Pool' is invalid.
[SUSE_Linux_Enterprise_Server_12_x86_64:SLES12-Pool|http://openqa.suse.de/assets/repo/SLE-12-SERVER-POOL-x86_64-Build0323-Media1/] Valid metadata not found at specified URL
Please check if the URIs defined for this repository are pointing to a valid repository.
Skipping repository 'SLES12-Pool' because of the above error.
Repository 'SLES12-Updates' is invalid.
[SUSE_Linux_Enterprise_Server_12_x86_64:SLES12-Updates|http://openqa.suse.de/assets/repo/SLE-12-SERVER-POOL-x86_64-Build0323-Media1/] Valid metadata not found at specified URL
Please check if the URIs defined for this repository are pointing to a valid repository.
Skipping repository 'SLES12-Updates' because of the above error.
Some of the repositories have not been refreshed because of an error.
'/usr/lib/zypper/commands/zypper-migration' exited with status 1

Failed as expected with invalid repo by proxyscc.

So I have a question, is it a correct way to migrate with LTSS or what I did wrong among the steps.
I will cc this info to Artem.

PR merged.
Added 8 cases both for online and offline migration with ltss and ltss+addons on x86_64 to job groups
For cases of ltss on s390x, it will take time to create sle12 images of s390x since only 1 zkvm-image worker available.

Created sles12sp1 ltss cases for x86_64 and s390x and added them to Migration: Server/HA job groups.
See the results in next build.

Related issue has been fixed.
Resolved with 12ga/12sp1 with ltss on x84_64 and 12sp1 with ltss on s390x.