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The ZFS tab shows the ARC, and names every caching tier a pool has or lacks

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A Cache section between the pools and the schedules. One card for the ARC:
size against its ceiling with the target and floor, sparklines of size and
hit rate from the sampler's history, what it holds (MRU/MFU/dirty, data vs
metadata, compression, the ghost lists), the prefetcher and dbuf cache, the
memory-pressure counters, and the since-boot breakdown by demand/prefetch
and data/metadata. Then a card per pool for L2ARC, SLOG, special vdev,
dedup table and spares — the devices and their fill where they exist, and
where they don't, plainly none and what that means (the ZIL writing to the
pool's own vdevs, with how much it has written).

Live numbers come from the sampler, which reads arcstats every tick and
publishes zfs.arc.* sensors; the fuller picture is read on request, with
zpool list -Hpv and zfs get run without sudo and cached for thirty seconds.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This commit is contained in:
Mitchell-Johnson
2026-10-02 18:30:02 -07:00
co-authored by Claude Fable 5.1
parent db40220365
commit b44faf3ac9
13 changed files with 736 additions and 2 deletions
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@@ -314,6 +314,20 @@ something long in one, switch away and back, refresh — it's all still there.
GPU shows the CPU package temperature marked `*`. Asahi (the Mac mini) has neither a busy
counter nor fdinfo in 6.19, so it lists the device and says so. No NVIDIA path: nothing here
has one to test against.
- **The ARC on the ZFS tab** — **shipped 2026-10-02** (`internal/metrics/arc.go`,
`internal/storage/arc.go`, `GET /api/zfs/arc`, the Cache section in `ZFS.tsx`, `zfs.arc.*`
sensors). Asked for as "current ARC usage, including any types of caching services in the
pool". One card for the ARC: size against its ceiling with the target and floor, sparklines
of size and hit rate from the sampler's history, what it holds (MRU/MFU/dirty, data vs
metadata, compression, the ghost lists), the prefetcher and dbuf cache, memory-pressure
counters, and the since-boot breakdown by demand/prefetch × data/metadata. Then a card per
pool naming every caching tier — L2ARC, SLOG, special vdev, dedup table, spares — with its
devices and fill, **or saying plainly that there is none and what that means** (the ZIL on
the pool's own vdevs, with how much it has written), plus the properties that steer caching
(`primarycache`, `secondarycache`, `sync`, `logbias`). Read from `/proc/spl/kstat/zfs/*`
and `/sys/module/zfs/parameters`, with `zpool list -Hpv` and `zfs get` run without sudo
(they need none) every 30 s at most. The day it shipped it showed `tank`'s ARC pinned at
its 2 GiB floor under `arc_no_grow`, with a 53 GiB python3 process holding the RAM.
- **Dashboard retired** — **2026-09-23**, at Mitchell's instruction, the same reasoning that
merged Top into Processes: the app repeated itself. The customisable module list is gone
(`Dashboard.tsx` deleted), and with it `/api/prefs/dashboard`, `applyPrefs`, and the