Storage

Overview

This is the build-and-break log for bringing a previously unstable TrueNAS/FreeBSD box back to a usable state after months of ugly crash behavior under VM load.

The short version:

• Salvaged hardware repurposed as a NAS
• A Fedora VM running Plex-related work could trigger a reboot loop
• Early on, the machine was already rebooting itself in a loop — even before the NVMe path failure showed up clearly in logs
• Hard evidence eventually pointed at one NVMe path (nvme2 / nda2) timing out and detaching under load
• Reseating the suspect SN770 and replacing its heatsink brought the mirror back online
• Current best hypothesis: physical seating, thermal contact, or mechanical instability — not a software bug

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ISSUE

Every good storage failure starts innocently.

Plug in a brand-new Samsung T7.
Select it in Time Machine.
Click “Use Disk.”
Allow macOS to format the drive automatically.
Let the backup run. It may even complete once — maybe even a few more times.
Then it fails with a generic error:
“An error occurred while preparing the backup.”

Time Machine consistently failed during the “Preparing backup” phase on macOS 26.3 (Tahoe).

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