- Red Hat Enterprise Linux (RHEL) with the High Availability Add-On
- Using IBM z Systems z/VM guests as RHEL High Availability cluster members
Useful References and Guides
- Support Policies for RHEL High Availability Clusters
- "Part III. IBM System z Architecture - Installation and Booting" in the Red Hat Enterprise Linux 7 Installation Guide.
This document offers Red Hat's policies around the conditions on which its technical support will be provided for RHEL High Availability clusters running on guest virtual machines of an IBM z Systems mainframe. Users of RHEL High Availability software components should adhere to these policies in order to be eligible to receive support from Red Hat with the appropriate product support subscriptions.
Supported releases: Red Hat supports use of IBM z Systems z/VM guests as RHEL High Availability cluster members under the following conditions:
- RHEL 8: Supported by Red Hat
- RHEL 7: Supported by Red Hat in RHEL 7.4 and later - specifically using
pacemaker-1.1.16-8.el7or later and
corosync-2.4.0-9.el7or later. Earlier releases in RHEL 7 are not supported.
- RHEL 6: Not supported by Red Hat.
This support is subject to the other conditions laid out here in this policy and in the overall Red Hat support policies for RHEL and RHEL High Availability.
- See also: Support policies for RHEL High Availability clusters
- See also: Support policies - Platforms and architectures for cluster nodes
Number of nodes: Red Hat supports RHEL High Availability clusters containing between two and four nodes running as IBM z Systems members.
Single Systems Image (SSI) cluster support: Red Hat supports RHEL High Availability clusters made up of members distributed throughout a SSI cluster. Nodes of the same RHEL cluster can reside on LPARs that are hosted by separate physical frames (CPCs, or CECs) within a SSI cluster.
No support for live migration: Red Hat can not provide support for concerns or behaviors arising from live migration of z/VM guests running as active RHEL High Availability cluster members. Nodes should be prevented from undergoing any sort of live migration while serving as an active member of the cluster.
Requirements for IBM z Systems LPAR serving RHEL High Availability members: Any RHEL High Availability cluster members must have the following conditions met by their LPAR:
- Running z/VM V6.3
- Should be configured with enough storage (memory) to back the storage allocated to the cluster.
- Should have IBM Directory Maintenance (DirMaint) for z/VM installed.
- If using
fence_zvmippower fencing`: SMAPI (Systems Management Application Programming Interface) service installed, which must be accessible to the cluster nodes via TCP/IP.
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