ops: detach sdg (ZL21HMR2) for RMA; tank fully ONLINE

.claude/handoffs/2026-06-14-215802-f3-unlock-and-tank-redundancy.md

@@ -93,12 +93,18 @@ yet** — stopped at "ready, awaiting bench hardware + go-ahead."
 - Pool reports DEGRADED — ONLY because `sdg` is intentionally OFFLINE. Not a fault.
 - Capacity cost: pool 549T→535T (~14T), 103T free @ 80%. Tunables reverted to stock.
 
-### Remaining decisions (open)
-1. **`sdg` endgame.** Now that mirror-35 has 2 healthy copies, the offline `sdg`
-   fallback is largely moot. Either: `zpool detach tank wwn-0x5000c500c37f4eff`
-   → clean ONLINE pool + pull sdg for RMA (recommended), OR keep it offline until a
-   real replacement disk exists (pool stays DEGRADED-labeled). Seth's call.
+### Remaining decisions
+1. **`sdg` — RESOLVED Jun 22:** detached. Pool now **ONLINE** (clean 2-way
+   mirror-35). Drive flagged for RMA & physical pull:
+   - **Serial `ZL21HMR2`** (Seagate Exos X16 ST16000NM001G-2KK103, 16 TB, fw SN04,
+     WWN 5000c500c37f4eff) — the failing one (30k pending sectors). Check Seagate
+     warranty by this serial.
+   - Physical location: **enclosure `6:0:15:0`, slot 8** (SAS expander
+     0x50060480012df53f, phy15). Locate LED set ON Jun 22; clears on pull/reset.
+   - Post-pull: nothing needed in ZFS (already detached). tank stays ONLINE.
 2. CLAR200 F3 unlock — still pending, unblocked, needs bench (see below).
+   Reminder: an unlocked CLAR200 16 TB would recover the ~14 TB capacity spent
+   here by re-adding it as a new vdev.
 
 ---
 ## (historical) IN PROGRESS — tank redundancy restore (no new disk path)