ci-server-engineer/.claude/skills/high-availability/SKILL.md

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description

high-availability

CI Server R1.03 high availability with HAC (redundant servers). Use when the user asks about redundant / dual / triple / quad servers, primary and secondary server, active and standby, switchover (automatic or manual), the HAC HMI (hacw_hmi), watchdog, recovery (restart a process or tool, hacrec, -wdg_off), mirror / synchronization of the standby, journaling and key file repair (isfjrn, *.jrn), history merge after an island situation (hachmfcmd), hac.sup, CI_PRIM, hacw_standby / hacw_stop scripts, HAC status items (SYSTEM.HAC1), hacitmval, HAC firewall ports (UDP 16000-16006), hardware watchdog or custom health checks, or applying a patch to a redundant system. Source IM 36K10J20-01EN.

High availability — HAC (R1.03)

Background: knowledge/manuals/IM36K10J20-01EN.md (concepts, processes, set-up steps, installed hac.sup and the differences from the manual).

Rules:

• Run system-check first; follow the user's chosen way of working.
• HAC needs its own licence and at least two servers with two separate networks between them. Nothing here was practiced on a real redundant pair: say so when giving procedures.
• hac.sup, the tls\com scripts and system variables need admin rights and a restart; hand them to the user (skill portal-setup, change-setup-file.md).
• Never switch over, reboot or change a server's mode on a running plant without the user's explicit approval, and only when the mirror is consistent (see redundant-setup.md §3).
• Do not start hacrec with -wdg_off on a server without reviewing its process list first: stand-alone Recovery acts (default action for most processes is TOOL = restart services).

Task	File	Status
Check HAC on a system: licence, processes, hac.sup, scripts, HMI properties, logs	tasks/hac-checks.md	verified (read-only, single server)
Set up and operate a redundant server pair: steps, hac.sup tabs, manual switchover, patching	tasks/redundant-setup.md	from docs
Recovery, logger and journaling on a stand-alone node	tasks/standalone-recovery.md	from docs
Dual-redundant Platform for Computer	—	not covered (separate product)