Six drives fills all eight bays, which turns a capacity top-up into a
one-shot build decision. Recorded because the reasoning survives whatever
he picks:
- raidz2 over mirrors. Workload is large sequential reads of safetensors,
ARC fronts it, SSD resilver has no seek penalty, and "expand two at a
time" is meaningless once every bay is full. raidz2 survives any two
failures; 4x mirrors dies to an unlucky pair.
- Buy 8, not 6. A raidz vdev caps every member at the smallest, so the
two as-bought 1.92 TB drives would cap all eight and put two used
drives of unknown endurance inside the parity set.
- Drive size is now the permanent ceiling. SAS/SATA backplane, all bays
full, and the free-PCIe-slot inventory is still unpulled.
Runway table included with an explicit caveat that the growth rate is
projected off one acquisition batch, not measured.
Memory-only; no version bump per the SemVer SKIP list.
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