# ana-ml2 pool health — three actions deferred to a clean-context session (2026-09-09)

Operator ruling 2026-09-09 ~00:30 PT: "snapshot and we'll do all 3 on clean context." Findings commit `3e18a04`.

**Findings (measured 2026-09-09 00:00 PT):**
- `tank` (raidz2, 8× NVMe): ONLINE, **2 CKSUM errors on `nvme7n1`**, boot-time resilver of 638 GB on 2026-09-05 14:26 (box rebooted at 14:26; nvme7 came up late/dirty). No data errors, 58% full. **No scrub since 2026-04-12** — the Debian `zfsutils-linux` second-Sunday cron scrubbed `zroot` on 08-09 but not `tank`; cause unknown (`zpool history tank` shows trims monthly, last scrub 04-12).
- No `nvme-cli` or `smartctl` on the box → nvme7's media-error counter unread.
- `zroot` at **91%** (345 G of 379 G): `docker system df` = images 429 GB (204 GB reclaimable), build cache 74 GB (36 GB reclaimable).
- pfi-pve `NASPool` 7% / `ospool` 19%, scrubbed 09-05 / 08-09, clean.

**The three actions, in order:**
1. `sudo zpool scrub tank` on ana-ml2 (1–2 h of extra I/O; seats keep serving) → on a clean pass `sudo zpool clear tank`; if the scrub finds errors on nvme7n1 → replace path.
2. `sudo apt install nvme-cli` → `sudo nvme smart-log /dev/nvme7` (media_errors, critical_warning, percentage_used) and `nvme id-ctrl` for model/serial; record in the drive inventory.
3. `docker image prune -a`? NO — `docker image prune` (dangling only) + `docker builder prune` on ana-ml2; the 47 unused-but-tagged images need a look first (some are rollback seats: e.g. `vllm/vllm-openai:v0.26.0`, nightlies). Target: zroot back under ~75%.
Also worth a look while there: why the scrub cron skips `tank` (`/usr/lib/zfs-linux/scrub` logic — it skips pools with an active trim/resilver or those not "healthy"?).