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store: Proxmox upgrade: stagger guest startup to avoid I/O storm

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Cal Corum 2026-02-19 11:05:45 -06:00
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---
id: b25708d0-f025-4d8e-8a68-69cfe8f604f1
type: decision
title: "Proxmox upgrade: stagger guest startup to avoid I/O storm"
tags: [proxmox, homelab, performance, upgrade]
importance: 0.7
confidence: 0.8
created: "2026-02-19T17:05:45.547388+00:00"
updated: "2026-02-19T17:05:45.547388+00:00"
---
## Decision: Stagger Guest Startup After Proxmox Upgrades
When starting all Proxmox guests after a reboot/upgrade, starting them all simultaneously causes massive I/O delay (50%+ for several minutes) because all Docker containers and services compete for the same LVM thin pool.
Recommendations for Phase 2 and future reboots:
1. Add sleep 30 between dependency groups during startup
2. Disable onboot=1 on all guests before upgrade, re-enable after validation
3. Restart Pi-hole Docker containers proactively after boot (UDP DNS may fail)
4. Switch local desktop DNS to public resolvers (1.1.1.1) before shutting down guests
5. Set DHCP reservation for Home Assistant VM to prevent IP changes