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Chapter 11. High availability and clusters

The following chapter contains the most notable changes to high availability and clusters between RHEL 9 and RHEL 10.

Support for the RHEL Resilient Storage Add-On has been removed

The Red Hat Enterprise Linux (RHEL) Resilient Storage Add-On will no longer be supported starting with Red Hat Enterprise Linux 10 and any subsequent releases after RHEL 10. The RHEL Resilient Storage Add-On will continue to be supported with earlier versions of RHEL (7, 8, 9) and throughout their respective maintenance support lifecycles.

pcsd Web UI no longer available as a standalone user interface

The pcsd Web UI is now available as the HA Cluster Management RHEL web console add-on. It is no longer operated as a standalone interface.

Removed functionality for the Red Hat High Availability Add-On

The following Red Hat High Availability Add-On features are no longer supported in RHEL 10.

  • Using spaces in dates in location constraint rules
  • Delimiting stonith devices with a comma in pcs stonith level add | clear | delete | remove commands
  • Ambiguous syntax of the pcs stonith level clear | delete | remove command. The commnd has been clarified to distinguish a target from a stonith device.
  • The legacy role names of master and slave`are no longer accepted by the `pcs command-line interface. Use Promoted, Unpromoted, --promoted, promotable, and promoted-max instead.
  • Using stonith resources in pcs resource commands and resources in pcs stonith commands, as well as --brief, --no-strict,--safe and --simulate flags of the pcs stonith disable command
  • Ability to create a stonith resource in a group with the pcs stonith create command
  • The stonith.create_in_group command from API v1 and v2
  • The pcs cluster pcsd-status command. Use the pcs status pcsd or pcs pcsd status command.
  • The pcs cluster certkey command. Use the pcs pcsd certkey command.
  • The pcs resource | stonith [op] defaults <name>=<value>…​ command. Use the pcs resource | stonith [op] defaults update command.
  • The pcs acl show command. Use the pcs acl config command.
  • The pcs alert show command. Use the pcs alert config command.
  • The pcs constraint [location | colocation | order | ticket] show | list commands. Use the pcs constraint [location | colocation | order | ticket] config command.
  • The pcs property show and the pcs property list commands. Use the pcs property config command.
  • The pcs tag list command. Use the pcs tag config command.
  • The --autodelete flag of the pcs resource move command.
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