⚙️ DevOps & Platform Eng

The Hidden Pitfalls of Real-Time NAS Sync — And the Systemd Fixes That Actually Work

You've got a Synology NAS humming away, but real-time sync with lsyncd and rsync turns into a nightmare of empty directories and phantom uploads. Here's the data-driven fix — straight from the boot trenches.

theAIcatchup Apr 10, 2026 4 min read
Systemd boot sequence diagram showing lsyncd NAS sync dependencies

⚡ Key Takeaways

  • Master systemd dependencies (BindsTo=, RequiresMountsFor=) to prevent outage-induced data dumps. 𝕏
  • Pair --size-only rsync with noac CIFS mounts to crush timestamp lies and redundant uploads. 𝕏
  • Ditch Dolphin auto-mounts; fstab ensures paths exist before lsyncd starts watching. 𝕏
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#NAS sync #Synology #Synology NAS #lsyncd #rsync #systemd #systemd dependencies #systemd mounts

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Originally reported by dev.to

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