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A drive is a drive: NVMe namespaces fold into their controller

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An Apple SSD presents three namespaces and the kernel lists each as a whole disk, so the
dashboard was showing one drive as three. The Disks page has always folded them; now the
dashboard, the Top tab and the disk.* sensors do too.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Mitchell-Johnson
2026-09-22 09:11:03 -07:00
co-authored by Claude Opus 5
parent 5761ee09db
commit 4b255fe63f
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SENSORS.md
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@@ -199,6 +199,16 @@ GET /api/fleet/sensors/query?machines=grid,wyse&cpu=cpu.usage&failed=services.f
→ {"core": {"cpu": 4.8, "up": 50211}, "grid": {"cpu": 0.4, "up": 437177}, "mac": {"error": "timeout"}}
```
## What counts as a disk
`disk.*` names **drives**, not the block devices the kernel lists. An NVMe controller can
present several namespaces — an Apple SSD shows `nvme0n1`, `nvme0n2` and `nvme0n3`, the last
two a few MiB of firmware — and each one arrives from `/proc/diskstats` looking like a whole
disk. They are folded into the controller (`disk.nvme0.*`), with the rates added and busy
taken as the longest of them rather than the sum, since they share one controller. This is
what the Disks page has always shown; since 2026-09-22 the dashboard, the Top tab and these
sensors agree with it.
## The Top tab
Ham Lab → **Top** is a whole machine on one screen in the style of btop: black ground, boxes