Release Notes #

These Release Notes are identical across all architectures, and the most recent version is always available online at https://www.suse.com/releasenotes.

Entries are only listed once but they can be referenced in several places if they are important and belong to more than one section.

Release notes usually only list changes that happened between two subsequent releases. Certain important entries from the release notes of previous product versions are repeated. To make these entries easier to identify, they contain a note to that effect.

However, repeated entries are provided as a courtesy only. Therefore, if you are skipping one or more service packs, check the release notes of the skipped service packs as well. If you are only reading the release notes of the current release, you could miss important changes.

SUSE Linux Enterprise High Availability 15 SP6 is an industry-leading open source high availability clustering system. It is designed to virtually eliminate unplanned downtime, be easy to use and be deployed in both physical and virtual environments. Also included are geo clustering capabilities, designed to manage cluster servers in data centers anywhere in the world. High availability clustering helps to minimize data loss due to corruption or failure by protecting your data assets using your existing IT infrastructure.

High availability clustering is used to automate application and data recovery. You can use our flexible, policy-driven clustering solution to implement highly available Linux clusters and eliminate single points of failure. Your servers are continuously monitored, and when a fault or failure occurs, the workload is transferred from one server to another, or the application is automatically restarted on a known working system. This helps you maintain business continuity and minimize unplanned downtime.

This section comprises information about modules and extensions for SUSE Linux Enterprise High Availability 15 SP6. Modules and extensions add parts or functionality to the system.

Information in this section applies to all architectures supported by SUSE Linux Enterprise High Availability 15 SP6.

SUSE Linux Enterprise High Availability can be deployed in several ways:

5.1 Installation #

This section includes information related to the initial installation of SUSE Linux Enterprise High Availability 15 SP6. Make sure to also review the respective section of the release notes for the base product, SUSE Linux Enterprise Server 15 SP6 which are published at https://www.suse.com/releasenotes/x86_64/SUSE-SLES/15-SP6.

Important: Installation Documentation

The following release notes contain additional notes regarding the installation of SUSE Linux Enterprise High Availability. However, they do not document the installation procedure itself.

For installation documentation, see the Installation and Setup Quick Start at https://documentation.suse.com/sle-ha-15/html/SLE-HA-all/article-installation.html and the Geo Clustering Quick Start at at https://documentation.suse.com/sle-ha-15/html/SLE-HA-all/article-geo-clustering.html.

5.2 Upgrade-Related Notes #

This section includes upgrade-related information for SUSE Linux Enterprise High Availability 15 SP6. Make sure to also review the respective section of the release notes for the base product, SUSE Linux Enterprise Server 15 SP6 which are published at https://www.suse.com/releasenotes/x86_64/SUSE-SLES/15-SP6.

Important: Upgrade Documentation

The following release notes contain additional notes regarding the upgrade of SUSE Linux Enterprise High Availability. However, they do not document the upgrade procedure itself.

For upgrade documentation, see the Admin Guide at https://documentation.suse.com/sle-ha-15/html/SLE-HA-all/book-administration.html.

5.2.1 Make Sure the Current System Is Up-To-Date Before Upgrading #

Upgrading the system is only supported from the most recent patch level. Make sure the latest system updates are installed by either running zypper patch or by starting the YaST module Online-Update. An upgrade on a system not fully patched may fail.

5.2.2 Skipping Service Packs Requires LTSS #

Skipping service packs during an upgrade is only supported if you have a Long Term Service Pack Support contract. Otherwise you first need to upgrade to SP5 before upgrading to SP6.

This section lists cluster-related information for SUSE Linux Enterprise High Availability 15 SP6.

6.1 Improve the graceful shutdown for the whole cluster #

There are several common use cases that might not result in a graceful shutdown of the whole cluster:

1. When a user takes down the cluster nodes one by one a diskless-sbd cluster, the nodes get fenced unexpectedly once the cluster is inquorate.

2. In the dlm cluster, with the highly suggested configuration no-quorum-policy=freeze, the cluster shutdown will hang once the cluster is inquorate. A new option set_config of dlm_tools is expected to help this situation.

3. To shutdown the normal cluster, the system admin often takes down the cluster nodes one by one. This might create unnecessary the resources migration chaos among nodes.

To help with some of these, a new --all options has been added to crmsh. The --all option tries to simplify the procedure and to make it more smoothly and reliable.

Warning

The --all option alone does not guarantee a graceful shutdown because the unforeseeable resource stop-failure might happen at the application level, which is out of the scope of the --all option. This means that users may need to take additional steps to match their product expectation.

This section list information related to the high-availability tools of SUSE Linux Enterprise High Availability 15 SP6.

7.2 Relax-and-Recover (ReaR) 2.7 #

The rear27a package has been added.

For more information see the full changelog either online at https://github.com/rear/rear/blob/rear-2.7/doc/rear-release-notes.txt or in the /usr/share/doc/packages/rear27a/rear-release-notes.txt file.

Warning

Do not upgrade ReaR or change the software used by ReaR without also checking that your existing disaster recovery procedure still works. See also the SUSE support for Relax-and-Recover and Version upgrades with Relax-and-Recover sections in https://en.opensuse.org/SDB:Disaster_Recovery.

This section list storage-related information for SUSE Linux Enterprise High Availability 15 SP6.

This section lists features and packages that got removed from SUSE Linux Enterprise High Availability or will be removed in upcoming versions.

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