# Runbook 2026-08-31 — COMPLETE (amended after the Oct replan)

Steps 1-3 below all landed and were verified read-only the same day (see
REPORT.md status banner + §8, and NEXT.md). Kept for the record. Paths
updated: repo moved ~/optimize → ~/projects/ultix.

**Remaining perf actions (as of 2026-08-31 evening):**
1. Net multiqueue activation — ONE graceful bounce of VM 5111:
   `~/projects/ultix/5-activate-multiqueue.sh` (~4 min, kills every crush
   session on this VM). Human ruling 08-31 eve: system idle tonight — good
   window after the session's remaining tasks. Verify after:
   `ethtool -l ens18` → Combined 4/4, `ethtool -l ens19` → 2/2.
2. Root growth 279G → ~505G — fully manual, step-by-step with checks:
   `~/projects/ultix/GROW-ROOT-RUNBOOK.md` (#603). No script runs it; you
   type every command yourself.

**Friday 2026-09-04 (#609) is TROUBLESHOOTING-ONLY**: USB SDR reseat +
zero-cost socket/PSU/BIOS checks. NO CPU/RAM swap, NO upgrades. All hardware
moved to the ~Oct 2026 window (#601: 2× X5675 + 6× 16GB → 192G; NFS outage
for -02 planned first; then q35 + 20 vCPU/128G + GPUs #606). Until then the
interim fences (accounts 3G/4.5G) and daynight interim values ARE the
operating config.

Original steps, for the record:
1. `sudo ~/projects/ultix/1-guest-prep.sh` — kernel tunables, BBR, THP,
   cgroup slices, PSI collector, day/night timers, docker daemon.json, sddm
   autologin. DONE + verified.
2. `ssh root@pfv-tsys5.knel.net 'bash -s -- --go' <
   ~/projects/ultix/2-host-one-shot.sh` — graceful stop of 5111,
   ssd/discard/multiqueue-config/onboot flags, cpuunits 9000 over the
   sectestbed fleet, start 5111. DONE + verified (16:01 bounce).
3. Verification — DONE (16:04-16:15 pass). Follow-up root cause: gateway
   prod was DOWN at boot (bind race + live-restore endpoint loss);
   permanently fixed same day by the ukrrs-gateway-ensure unit, both lanes.

Rollback notes unchanged: apply-guest backs up every file it touches; qm
flags are individually reversible.