Add tree-line connector for RAID child drives in host drives card

Parse sg_ses --page=0x02 output to surface enclosure-level health data
including power supply status, fan RPMs, temperature sensors, and voltage
rails. Failed/critical components are reflected in the overview totals
and shown as status pills in the enclosure card header with an expandable
detail panel.

build.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+IMAGE="docker.adamksmith.xyz/jbod-monitor"
+
+cd "$(dirname "$0")"
+
+# Stage and commit all changes
+git add -A
+if git diff --cached --quiet; then
+    echo "No changes to commit, using HEAD"
+else
+    git commit -m "${1:-Build and push image}"
+fi
+
+SHA=$(git rev-parse --short HEAD)
+
+echo "Building ${IMAGE}:${SHA}"
+docker build -t "${IMAGE}:${SHA}" -t "${IMAGE}:latest" .
+
+echo "Pushing ${IMAGE}:${SHA}"
+docker push "${IMAGE}:${SHA}"
+docker push "${IMAGE}:latest"
+
+echo "Done: ${IMAGE}:${SHA}"

docker-compose.yml

@@ -15,3 +15,22 @@ services:
       - TZ=America/Denver
       - UVICORN_LOG_LEVEL=info
       - ZFS_USE_NSENTER=true
+      - REDIS_HOST=127.0.0.1
+      - REDIS_PORT=6379
+      - REDIS_DB=0
+      - SMART_CACHE_TTL=120
+      - SMART_POLL_INTERVAL=90
+    depends_on:
+      - redis
+
+  redis:
+    image: redis:7-alpine
+    container_name: jbod-redis
+    restart: unless-stopped
+    network_mode: host
+    volumes:
+      - redis-data:/data
+    command: redis-server --save 60 1 --loglevel warning
+
+volumes:
+  redis-data:

frontend/src/App.jsx

@@ -698,9 +698,20 @@ function HostDrivesCard({ drives, onSelect, t }) {
                   </span>
                 )}
               </div>
-              {d.physical_drives?.map((pd, i) => (
-                <HostDriveRow key={pd.serial || i} d={pd} onSelect={onSelect} t={t} indent />
-              ))}
+              {d.physical_drives?.length > 0 && (
+                <div style={{ marginLeft: 20, borderLeft: `2px solid ${t.cardBorder}`, paddingLeft: 0 }}>
+                  {d.physical_drives.map((pd, i) => (
+                    <div key={pd.serial || i} style={{ display: "flex", alignItems: "center", marginTop: 4 }}>
+                      <div style={{
+                        width: 16, height: 1, background: t.cardBorder, flexShrink: 0,
+                      }} />
+                      <div style={{ flex: 1 }}>
+                        <HostDriveRow d={pd} onSelect={onSelect} t={t} indent />
+                      </div>
+                    </div>
+                  ))}
+                </div>
+              )}
             </React.Fragment>
           ))}
         </div>
@@ -709,7 +720,181 @@ function HostDrivesCard({ drives, onSelect, t }) {
   );
 }
 
+function EnclosureHealthSummary({ health, t }) {
+  if (!health) return null;
+
+  const statusColors = {
+    CRITICAL: t.health.error,
+    WARNING: t.health.warning,
+    OK: t.health.healthy,
+  };
+  const sc = statusColors[health.overall_status] || statusColors.OK;
+
+  const failedPsus = health.psus.filter((p) => p.fail || p.status.toLowerCase() === "critical");
+  const failedFans = health.fans.filter((f) => f.fail);
+  const temps = health.temps.filter((s) => s.temperature_c != null);
+  const tempMin = temps.length > 0 ? Math.min(...temps.map((s) => s.temperature_c)) : null;
+  const tempMax = temps.length > 0 ? Math.max(...temps.map((s) => s.temperature_c)) : null;
+
+  return (
+    <div style={{ display: "flex", alignItems: "center", gap: 8, flexWrap: "wrap", marginTop: 6 }}>
+      {/* Overall badge */}
+      <span style={{
+        display: "inline-flex", alignItems: "center", gap: 5,
+        padding: "2px 10px", borderRadius: 99,
+        background: sc.bg, border: `1px solid ${sc.border}`,
+        fontSize: 11, fontWeight: 700, color: sc.text, letterSpacing: 0.3,
+      }}>
+        <span style={{ width: 6, height: 6, borderRadius: "50%", background: sc.dot }} />
+        {health.overall_status}
+      </span>
+
+      {/* PSU pills */}
+      {health.psus.map((psu) => {
+        const bad = psu.fail || psu.status.toLowerCase() === "critical";
+        const pc = bad ? t.health.error : t.health.healthy;
+        return (
+          <span key={psu.index} style={{
+            display: "inline-flex", alignItems: "center", gap: 4,
+            padding: "2px 8px", borderRadius: 99,
+            background: pc.bg, border: `1px solid ${pc.border}`,
+            fontSize: 10, fontWeight: 600, color: pc.text,
+          }}>
+            <span style={{ width: 5, height: 5, borderRadius: "50%", background: pc.dot }} />
+            PSU {psu.index} {bad ? "FAIL" : "OK"}
+          </span>
+        );
+      })}
+
+      {/* Fans summary */}
+      {health.fans.length > 0 && (
+        <span style={{
+          fontSize: 11, color: failedFans.length > 0 ? t.health.error.text : t.textSecondary,
+          fontWeight: 600,
+        }}>
+          {failedFans.length > 0
+            ? `${failedFans.length}/${health.fans.length} fans failed`
+            : `${health.fans.length} fans OK`}
+        </span>
+      )}
+
+      {/* Temp range */}
+      {tempMin != null && (
+        <span style={{
+          fontSize: 11, color: tempMax >= 45 ? t.health.warning.text : t.textSecondary,
+          fontWeight: 600, fontFamily: "'JetBrains Mono', monospace",
+        }}>
+          {tempMin === tempMax ? `${tempMin}\u00B0C` : `${tempMin}\u2013${tempMax}\u00B0C`}
+        </span>
+      )}
+    </div>
+  );
+}
+
+function EnclosureHealthDetail({ health, t }) {
+  if (!health) return null;
+
+  const sectionStyle = { marginBottom: 12 };
+  const headerStyle = {
+    fontSize: 10, fontWeight: 700, color: t.textMuted,
+    textTransform: "uppercase", letterSpacing: 1, marginBottom: 6,
+  };
+  const rowStyle = {
+    display: "flex", justifyContent: "space-between", alignItems: "center",
+    padding: "4px 0", borderBottom: `1px solid ${t.divider}`, fontSize: 12,
+  };
+
+  return (
+    <div style={{
+      padding: "12px 16px", background: t.surface,
+      borderTop: `1px solid ${t.divider}`, borderBottom: `1px solid ${t.divider}`,
+    }}>
+      <div style={{ display: "grid", gridTemplateColumns: "repeat(auto-fit, minmax(220px, 1fr))", gap: 16 }}>
+        {/* PSUs */}
+        {health.psus.length > 0 && (
+          <div style={sectionStyle}>
+            <div style={headerStyle}>Power Supplies</div>
+            {health.psus.map((psu) => {
+              const bad = psu.fail || psu.status.toLowerCase() === "critical";
+              return (
+                <div key={psu.index} style={rowStyle}>
+                  <span style={{ color: t.textSecondary }}>PSU {psu.index}</span>
+                  <span style={{
+                    fontWeight: 600, color: bad ? t.health.error.text : t.health.healthy.text,
+                    fontFamily: "'JetBrains Mono', monospace",
+                  }}>
+                    {psu.status}{psu.ac_fail ? " (AC fail)" : ""}{psu.dc_fail ? " (DC fail)" : ""}
+                  </span>
+                </div>
+              );
+            })}
+          </div>
+        )}
+
+        {/* Fans */}
+        {health.fans.length > 0 && (
+          <div style={sectionStyle}>
+            <div style={headerStyle}>Fans</div>
+            {health.fans.map((fan) => (
+              <div key={fan.index} style={rowStyle}>
+                <span style={{ color: t.textSecondary }}>Fan {fan.index}</span>
+                <span style={{
+                  fontWeight: 600,
+                  color: fan.fail ? t.health.error.text : t.health.healthy.text,
+                  fontFamily: "'JetBrains Mono', monospace",
+                }}>
+                  {fan.rpm != null ? `${fan.rpm} RPM` : fan.status}
+                  {fan.fail ? " FAIL" : ""}
+                </span>
+              </div>
+            ))}
+          </div>
+        )}
+
+        {/* Temps */}
+        {health.temps.length > 0 && (
+          <div style={sectionStyle}>
+            <div style={headerStyle}>Temperature Sensors</div>
+            {health.temps.map((ts) => (
+              <div key={ts.index} style={rowStyle}>
+                <span style={{ color: t.textSecondary }}>Sensor {ts.index}</span>
+                <span style={{
+                  fontWeight: 600,
+                  color: ts.temperature_c >= 45 ? t.health.warning.text : t.text,
+                  fontFamily: "'JetBrains Mono', monospace",
+                }}>
+                  {ts.temperature_c != null ? `${ts.temperature_c}\u00B0C` : ts.status}
+                </span>
+              </div>
+            ))}
+          </div>
+        )}
+
+        {/* Voltages */}
+        {health.voltages.length > 0 && (
+          <div style={sectionStyle}>
+            <div style={headerStyle}>Voltage Rails</div>
+            {health.voltages.map((vs) => (
+              <div key={vs.index} style={rowStyle}>
+                <span style={{ color: t.textSecondary }}>Rail {vs.index}</span>
+                <span style={{
+                  fontWeight: 600, color: t.text,
+                  fontFamily: "'JetBrains Mono', monospace",
+                }}>
+                  {vs.voltage != null ? `${vs.voltage} V` : vs.status}
+                </span>
+              </div>
+            ))}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}
+
 function EnclosureCard({ enclosure, view, onSelect, selectedSerial, t }) {
+  const [healthExpanded, setHealthExpanded] = useState(false);
+
   return (
     <div style={{
       background: t.cardBg, borderRadius: 16,
@@ -720,7 +905,7 @@ function EnclosureCard({ enclosure, view, onSelect, selectedSerial, t }) {
       <div style={{
         padding: "16px 20px",
         borderBottom: `1px solid ${t.divider}`,
-        display: "flex", alignItems: "center", justifyContent: "space-between",
+        display: "flex", alignItems: "flex-start", justifyContent: "space-between",
         flexWrap: "wrap", gap: 8,
       }}>
         <div>
@@ -730,11 +915,29 @@ function EnclosureCard({ enclosure, view, onSelect, selectedSerial, t }) {
           <div style={{ fontSize: 12, color: t.textSecondary, marginTop: 2 }}>
             {enclosure.sg_device} &middot; {enclosure.populated_slots}/{enclosure.total_slots} slots populated
           </div>
+          {enclosure.health && (
+            <div style={{ display: "flex", alignItems: "center", gap: 6 }}>
+              <EnclosureHealthSummary health={enclosure.health} t={t} />
+              <button
+                onClick={() => setHealthExpanded(!healthExpanded)}
+                style={{
+                  background: "none", border: "none", cursor: "pointer",
+                  fontSize: 11, color: t.accent, fontWeight: 600,
+                  padding: "2px 6px", marginTop: 6,
+                }}
+              >
+                {healthExpanded ? "Hide details" : "Details"}
+              </button>
+            </div>
+          )}
         </div>
         <div style={{ fontSize: 11, color: t.textMuted, fontFamily: "'JetBrains Mono', monospace" }}>
           ID {enclosure.id}
         </div>
       </div>
+      {healthExpanded && enclosure.health && (
+        <EnclosureHealthDetail health={enclosure.health} t={t} />
+      )}
       <div style={{ padding: 16 }}>
         {view === "grid" ? (
           <GridView enclosure={enclosure} onSelect={onSelect} t={t} />

main.py

@@ -1,15 +1,20 @@
+import asyncio
+import json
 import logging
 import os
+from contextlib import asynccontextmanager
 from pathlib import Path
 
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.responses import FileResponse
 from fastapi.staticfiles import StaticFiles
 
 from models.schemas import HealthCheck
 from routers import drives, enclosures, leds, overview
-from services.smart import sg_ses_available, smartctl_available
+from services.cache import cache_set, close_cache, init_cache, redis_available
+from services.enclosure import discover_enclosures, list_slots
+from services.smart import SMART_CACHE_TTL, _run_smartctl, sg_ses_available, smartctl_available
+from services.zfs import get_zfs_pool_map
 
 logging.basicConfig(
     level=logging.INFO,
@@ -17,10 +22,96 @@ logging.basicConfig(
 )
 logger = logging.getLogger(__name__)
 
+SMART_POLL_INTERVAL = int(os.environ.get("SMART_POLL_INTERVAL", "90"))
+
+_tool_status: dict[str, bool] = {}
+_poll_task: asyncio.Task | None = None
+
+
+async def smart_poll_loop():
+    """Pre-warm Redis with SMART data for all drives."""
+    await asyncio.sleep(2)  # let app finish starting
+    while True:
+        try:
+            # Discover all enclosure devices
+            enclosures_raw = discover_enclosures()
+            devices: set[str] = set()
+            for enc in enclosures_raw:
+                for slot in list_slots(enc["id"]):
+                    if slot["device"]:
+                        devices.add(slot["device"])
+
+            # Discover host block devices via lsblk
+            try:
+                proc = await asyncio.create_subprocess_exec(
+                    "lsblk", "-d", "-o", "NAME,TYPE", "-J",
+                    stdout=asyncio.subprocess.PIPE,
+                    stderr=asyncio.subprocess.PIPE,
+                )
+                stdout, _ = await proc.communicate()
+                if stdout:
+                    for dev in json.loads(stdout).get("blockdevices", []):
+                        if dev.get("type") == "disk":
+                            name = dev.get("name", "")
+                            if name and name not in devices:
+                                devices.add(name)
+            except Exception as e:
+                logger.warning("lsblk discovery failed in poller: %s", e)
+
+            # Poll each drive and cache result
+            for device in sorted(devices):
+                try:
+                    result = await _run_smartctl(device)
+                    await cache_set(f"jbod:smart:{device}", result, SMART_CACHE_TTL)
+                except Exception as e:
+                    logger.warning("Poll failed for %s: %s", device, e)
+
+            # Pre-warm ZFS map (bypasses cache by calling directly)
+            await get_zfs_pool_map()
+
+            logger.info("SMART poll complete: %d devices", len(devices))
+        except Exception as e:
+            logger.error("SMART poll loop error: %s", e)
+        await asyncio.sleep(SMART_POLL_INTERVAL)
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    global _poll_task
+    # Startup
+    _tool_status["smartctl"] = smartctl_available()
+    _tool_status["sg_ses"] = sg_ses_available()
+
+    if not _tool_status["smartctl"]:
+        logger.warning("smartctl not found — install smartmontools for SMART data")
+    if not _tool_status["sg_ses"]:
+        logger.warning("sg_ses not found — install sg3-utils for enclosure SES data")
+    if os.geteuid() != 0:
+        logger.warning("Not running as root — smartctl may fail on some devices")
+
+    await init_cache()
+    _tool_status["redis"] = redis_available()
+
+    if redis_available():
+        _poll_task = asyncio.create_task(smart_poll_loop())
+
+    yield
+
+    # Shutdown
+    if _poll_task is not None:
+        _poll_task.cancel()
+        try:
+            await _poll_task
+        except asyncio.CancelledError:
+            pass
+    await close_cache()
+
+
 app = FastAPI(
     title="JBOD Monitor",
     description="Drive health monitoring for JBOD enclosures",
     version="0.1.0",
+    lifespan=lifespan,
 )
 
 app.add_middleware(
@@ -35,24 +126,10 @@ app.include_router(drives.router)
 app.include_router(leds.router)
 app.include_router(overview.router)
 
-_tool_status: dict[str, bool] = {}
-
-
-@app.on_event("startup")
-async def check_dependencies():
-    _tool_status["smartctl"] = smartctl_available()
-    _tool_status["sg_ses"] = sg_ses_available()
-
-    if not _tool_status["smartctl"]:
-        logger.warning("smartctl not found — install smartmontools for SMART data")
-    if not _tool_status["sg_ses"]:
-        logger.warning("sg_ses not found — install sg3-utils for enclosure SES data")
-    if os.geteuid() != 0:
-        logger.warning("Not running as root — smartctl may fail on some devices")
-
 
 @app.get("/api/health", response_model=HealthCheck, tags=["health"])
 async def health():
+    _tool_status["redis"] = redis_available()
     return HealthCheck(status="ok", tools=_tool_status)
 
 

models/schemas.py

@@ -65,6 +65,41 @@ class SlotWithDrive(BaseModel):
     drive: DriveHealthSummary | None = None
 
 
+class PsuStatus(BaseModel):
+    index: int
+    status: str
+    fail: bool = False
+    ac_fail: bool = False
+    dc_fail: bool = False
+
+
+class FanStatus(BaseModel):
+    index: int
+    status: str
+    rpm: int | None = None
+    fail: bool = False
+
+
+class TempSensor(BaseModel):
+    index: int
+    status: str
+    temperature_c: float | None = None
+
+
+class VoltageSensor(BaseModel):
+    index: int
+    status: str
+    voltage: float | None = None
+
+
+class EnclosureHealth(BaseModel):
+    overall_status: str = "OK"
+    psus: list[PsuStatus] = []
+    fans: list[FanStatus] = []
+    temps: list[TempSensor] = []
+    voltages: list[VoltageSensor] = []
+
+
 class EnclosureWithDrives(BaseModel):
     id: str
     sg_device: str | None = None
@@ -74,6 +109,7 @@ class EnclosureWithDrives(BaseModel):
     total_slots: int
     populated_slots: int
     slots: list[SlotWithDrive]
+    health: EnclosureHealth | None = None
 
 
 class HostDrive(BaseModel):

requirements.txt

@@ -1,3 +1,4 @@
 fastapi>=0.115.0
 uvicorn>=0.34.0
 pydantic>=2.10.0
+redis>=5.0.0

routers/drives.py

@@ -1,4 +1,4 @@
-from fastapi import APIRouter, HTTPException
+from fastapi import APIRouter, HTTPException, Response
 
 from models.schemas import DriveDetail
 from services.smart import get_smart_data
@@ -8,10 +8,10 @@ router = APIRouter(prefix="/api/drives", tags=["drives"])
 
 
 @router.get("/{device}", response_model=DriveDetail)
-async def get_drive_detail(device: str):
+async def get_drive_detail(device: str, response: Response):
     """Get SMART detail for a specific block device."""
     try:
-        data = await get_smart_data(device)
+        data, cache_hit = await get_smart_data(device)
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))
 
@@ -25,4 +25,6 @@ async def get_drive_detail(device: str):
         data["zfs_vdev"] = zfs_info["vdev"]
         data["zfs_state"] = zfs_info.get("state")
 
+    response.headers["X-Cache"] = "HIT" if cache_hit else "MISS"
+
     return DriveDetail(**data)

routers/overview.py

@@ -1,16 +1,17 @@
 import asyncio
 import logging
 
-from fastapi import APIRouter
+from fastapi import APIRouter, Response
 
 from models.schemas import (
     DriveHealthSummary,
+    EnclosureHealth,
     EnclosureWithDrives,
     HostDrive,
     Overview,
     SlotWithDrive,
 )
-from services.enclosure import discover_enclosures, list_slots
+from services.enclosure import discover_enclosures, get_enclosure_status, list_slots
 from services.host import get_host_drives
 from services.smart import get_smart_data
 from services.zfs import get_zfs_pool_map
@@ -21,18 +22,29 @@ router = APIRouter(prefix="/api/overview", tags=["overview"])
 
 
 @router.get("", response_model=Overview)
-async def get_overview():
+async def get_overview(response: Response):
     """Aggregate view of all enclosures, slots, and drive health."""
     enclosures_raw = discover_enclosures()
     pool_map = await get_zfs_pool_map()
 
+    # Fetch SES health data for all enclosures concurrently
+    async def _get_health(enc):
+        if enc.get("sg_device"):
+            return await get_enclosure_status(enc["sg_device"])
+        return None
+
+    health_results = await asyncio.gather(
+        *[_get_health(enc) for enc in enclosures_raw],
+        return_exceptions=True,
+    )
+
     enc_results: list[EnclosureWithDrives] = []
     total_drives = 0
     warnings = 0
     errors = 0
     all_healthy = True
 
-    for enc in enclosures_raw:
+    for enc_idx, enc in enumerate(enclosures_raw):
         slots_raw = list_slots(enc["id"])
 
         # Gather SMART data for all populated slots concurrently
@@ -41,12 +53,19 @@ async def get_overview():
         smart_results = await asyncio.gather(*smart_tasks, return_exceptions=True)
 
         smart_map: dict[str, dict] = {}
+        all_cache_hits = True
+        any_lookups = False
         for (slot_info, dev), result in zip(populated, smart_results):
             if isinstance(result, Exception):
                 logger.warning("SMART query failed for %s: %s", dev, result)
                 smart_map[dev] = {"device": dev, "smart_supported": False}
+                all_cache_hits = False
             else:
-                smart_map[dev] = result
+                data, hit = result
+                smart_map[dev] = data
+                any_lookups = True
+                if not hit:
+                    all_cache_hits = False
 
         slots_out: list[SlotWithDrive] = []
         for s in slots_raw:
@@ -110,6 +129,20 @@ async def get_overview():
                 drive=drive_summary,
             ))
 
+        # Attach enclosure health from SES
+        health_data = health_results[enc_idx]
+        enc_health = None
+        if isinstance(health_data, dict):
+            enc_health = EnclosureHealth(**health_data)
+            # Count enclosure-level issues
+            if enc_health.overall_status == "CRITICAL":
+                errors += 1
+                all_healthy = False
+            elif enc_health.overall_status == "WARNING":
+                warnings += 1
+        elif isinstance(health_data, Exception):
+            logger.warning("SES health failed for %s: %s", enc["id"], health_data)
+
         enc_results.append(EnclosureWithDrives(
             id=enc["id"],
             sg_device=enc.get("sg_device"),
@@ -119,6 +152,7 @@ async def get_overview():
             total_slots=enc["total_slots"],
             populated_slots=enc["populated_slots"],
             slots=slots_out,
+            health=enc_health,
         ))
 
     # Host drives (non-enclosure)
@@ -143,6 +177,8 @@ async def get_overview():
                 warnings += 1
         host_drives_out.append(HostDrive(**hd))
 
+    response.headers["X-Cache"] = "HIT" if (any_lookups and all_cache_hits) else "MISS"
+
     return Overview(
         healthy=all_healthy and errors == 0,
         drive_count=total_drives,

services/cache.py

@@ -1,29 +1,62 @@
-import time
+import json
+import logging
+import os
 from typing import Any
 
+import redis.asyncio as redis
 
-class TTLCache:
-    """Simple in-memory TTL cache."""
+logger = logging.getLogger(__name__)
 
-    def __init__(self, ttl_seconds: int = 60):
-        self._ttl = ttl_seconds
-        self._store: dict[str, tuple[float, Any]] = {}
+_redis: redis.Redis | None = None
 
-    def get(self, key: str) -> Any | None:
-        entry = self._store.get(key)
-        if entry is None:
+
+async def init_cache() -> None:
+    """Create Redis connection from environment variables."""
+    global _redis
+    host = os.environ.get("REDIS_HOST", "localhost")
+    port = int(os.environ.get("REDIS_PORT", "6379"))
+    db = int(os.environ.get("REDIS_DB", "0"))
+    try:
+        _redis = redis.Redis(host=host, port=port, db=db, decode_responses=True)
+        await _redis.ping()
+        logger.info("Redis connected at %s:%d/%d", host, port, db)
+    except Exception as e:
+        logger.warning("Redis connection failed: %s — running without cache", e)
+        _redis = None
+
+
+async def close_cache() -> None:
+    """Close Redis connection."""
+    global _redis
+    if _redis is not None:
+        await _redis.aclose()
+        _redis = None
+
+
+def redis_available() -> bool:
+    """Return whether Redis connection is live."""
+    return _redis is not None
+
+
+async def cache_get(key: str) -> Any | None:
+    """GET key from Redis, return deserialized value or None on miss/error."""
+    if _redis is None:
+        return None
+    try:
+        raw = await _redis.get(key)
+        if raw is None:
             return None
-        ts, value = entry
-        if time.monotonic() - ts > self._ttl:
-            del self._store[key]
-            return None
-        return value
-
-    def set(self, key: str, value: Any) -> None:
-        self._store[key] = (time.monotonic(), value)
-
-    def clear(self) -> None:
-        self._store.clear()
+        return json.loads(raw)
+    except Exception as e:
+        logger.warning("Redis GET %s failed: %s", key, e)
+        return None
 
 
-smart_cache = TTLCache(ttl_seconds=60)
+async def cache_set(key: str, value: Any, ttl: int = 120) -> None:
+    """SET key in Redis with expiry, silently catches errors."""
+    if _redis is None:
+        return
+    try:
+        await _redis.set(key, json.dumps(value), ex=ttl)
+    except Exception as e:
+        logger.warning("Redis SET %s failed: %s", key, e)

services/enclosure.py

@@ -1,5 +1,7 @@
-import os
+import asyncio
 import logging
+import os
+import re
 from pathlib import Path
 
 logger = logging.getLogger(__name__)
@@ -136,3 +138,121 @@ def _parse_slot_number(entry: Path) -> int | None:
             except ValueError:
                 return None
     return None
+
+
+async def get_enclosure_status(sg_device: str) -> dict | None:
+    """Run sg_ses --page=0x02 and parse enclosure health data."""
+    try:
+        proc = await asyncio.create_subprocess_exec(
+            "sg_ses", "--page=0x02", sg_device,
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE,
+        )
+        stdout, stderr = await proc.communicate()
+        if proc.returncode != 0:
+            logger.warning("sg_ses failed for %s: %s", sg_device, stderr.decode().strip())
+            return None
+        return _parse_ses_page02(stdout.decode(errors="replace"))
+    except FileNotFoundError:
+        logger.warning("sg_ses not found")
+        return None
+    except Exception as e:
+        logger.warning("sg_ses error for %s: %s", sg_device, e)
+        return None
+
+
+def _parse_ses_page02(text: str) -> dict:
+    """Parse sg_ses --page=0x02 text output into structured health data."""
+    result = {
+        "overall_status": "OK",
+        "psus": [],
+        "fans": [],
+        "temps": [],
+        "voltages": [],
+    }
+
+    # Parse header line for overall status:
+    # INVOP=0, INFO=0, NON-CRIT=0, CRIT=1, UNRECOV=0
+    header_match = re.search(
+        r"INVOP=\d+,\s*INFO=\d+,\s*NON-CRIT=(\d+),\s*CRIT=(\d+),\s*UNRECOV=(\d+)",
+        text,
+    )
+    if header_match:
+        non_crit = int(header_match.group(1))
+        crit = int(header_match.group(2))
+        unrecov = int(header_match.group(3))
+        if crit > 0 or unrecov > 0:
+            result["overall_status"] = "CRITICAL"
+        elif non_crit > 0:
+            result["overall_status"] = "WARNING"
+
+    # Split into element type sections.
+    # Each section starts with "Element type: <type>"
+    sections = re.split(r"(?=\s*Element type:)", text)
+
+    for section in sections:
+        type_match = re.match(r"\s*Element type:\s*(.+)", section)
+        if not type_match:
+            continue
+        element_type = type_match.group(1).strip().rstrip(",").lower()
+
+        # Find individual element blocks (skip "Overall descriptor")
+        elements = re.split(r"(?=\s*Element \d+ descriptor:)", section)
+
+        for elem_text in elements:
+            desc_match = re.match(r"\s*Element (\d+) descriptor:", elem_text)
+            if not desc_match:
+                continue
+            idx = int(desc_match.group(1))
+
+            # Extract status line
+            status_match = re.search(r"status:\s*(.+?)(?:,|\n|$)", elem_text, re.IGNORECASE)
+            status = status_match.group(1).strip() if status_match else "Unknown"
+
+            if status.lower() == "not installed":
+                continue
+
+            if "power supply" in element_type:
+                fail = "Fail=1" in elem_text
+                ac_fail = "AC fail=1" in elem_text
+                dc_fail = "DC fail=1" in elem_text
+                result["psus"].append({
+                    "index": idx,
+                    "status": status,
+                    "fail": fail,
+                    "ac_fail": ac_fail,
+                    "dc_fail": dc_fail,
+                })
+
+            elif "cooling" in element_type or "fan" in element_type:
+                fail = "Fail=1" in elem_text
+                rpm_match = re.search(r"Actual speed[=:]\s*(\d+)\s*rpm", elem_text, re.IGNORECASE)
+                rpm = int(rpm_match.group(1)) if rpm_match else None
+                result["fans"].append({
+                    "index": idx,
+                    "status": status,
+                    "rpm": rpm,
+                    "fail": fail,
+                })
+
+            elif "temperature" in element_type:
+                temp_match = re.search(r"Temperature=\s*([\d.]+)\s*C", elem_text)
+                temp = float(temp_match.group(1)) if temp_match else None
+                result["temps"].append({
+                    "index": idx,
+                    "status": status,
+                    "temperature_c": temp,
+                })
+
+            elif "voltage" in element_type:
+                volt_match = re.search(r"Voltage:\s*([\d.]+)\s*V", elem_text, re.IGNORECASE)
+                if not volt_match:
+                    volt_match = re.search(r"([\d.]+)\s*V", elem_text)
+                voltage = float(volt_match.group(1)) if volt_match else None
+                result["voltages"].append({
+                    "index": idx,
+                    "status": status,
+                    "voltage": voltage,
+                })
+
+    return result

services/host.py

@@ -65,12 +65,14 @@ async def get_host_drives() -> list[dict]:
     smart_results = await asyncio.gather(*smart_tasks, return_exceptions=True)
 
     results: list[dict] = []
-    for dev_info, smart in zip(host_devices, smart_results):
+    for dev_info, smart_result in zip(host_devices, smart_results):
         name = dev_info["name"]
 
-        if isinstance(smart, Exception):
-            logger.warning("SMART query failed for host drive %s: %s", name, smart)
+        if isinstance(smart_result, Exception):
+            logger.warning("SMART query failed for host drive %s: %s", name, smart_result)
             smart = {"device": name, "smart_supported": False}
+        else:
+            smart, _ = smart_result
 
         # Compute health_status (same logic as overview.py)
         healthy = smart.get("smart_healthy")

services/smart.py

@@ -1,10 +1,11 @@
 import asyncio
 import json
 import logging
+import os
 import re
 import shutil
 
-from services.cache import smart_cache
+from services.cache import cache_get, cache_set
 
 logger = logging.getLogger(__name__)
 
@@ -17,6 +18,8 @@ ATTR_PENDING = 197
 ATTR_UNCORRECTABLE = 198
 ATTR_WEAR_LEVELING = 177  # SSD wear leveling
 
+SMART_CACHE_TTL = int(os.environ.get("SMART_CACHE_TTL", "120"))
+
 
 def smartctl_available() -> bool:
     return shutil.which("smartctl") is not None
@@ -26,19 +29,22 @@ def sg_ses_available() -> bool:
     return shutil.which("sg_ses") is not None
 
 
-async def get_smart_data(device: str) -> dict:
-    """Run smartctl -a -j against a device, with caching."""
+async def get_smart_data(device: str) -> tuple[dict, bool]:
+    """Run smartctl -a -j against a device, with caching.
+
+    Returns (data, cache_hit) tuple.
+    """
     # Sanitize device name: only allow alphanumeric and hyphens
     if not re.match(r"^[a-zA-Z0-9\-]+$", device):
         raise ValueError(f"Invalid device name: {device}")
 
-    cached = smart_cache.get(device)
+    cached = await cache_get(f"jbod:smart:{device}")
     if cached is not None:
-        return cached
+        return (cached, True)
 
     result = await _run_smartctl(device)
-    smart_cache.set(device, result)
-    return result
+    await cache_set(f"jbod:smart:{device}", result, SMART_CACHE_TTL)
+    return (result, False)
 
 
 async def _run_smartctl(device: str) -> dict:

services/zfs.py

@@ -4,11 +4,15 @@ import logging
 import re
 from pathlib import Path
 
+from services.cache import cache_get, cache_set
+
 logger = logging.getLogger(__name__)
 
 # Allow overriding the zpool binary path via env (for bind-mounted host tools)
 ZPOOL_BIN = os.environ.get("ZPOOL_BIN", "zpool")
 
+ZFS_CACHE_TTL = 300
+
 
 async def get_zfs_pool_map() -> dict[str, dict]:
     """Return a dict mapping device names to ZFS pool and vdev info.
@@ -16,6 +20,10 @@ async def get_zfs_pool_map() -> dict[str, dict]:
     e.g. {"sda": {"pool": "tank", "vdev": "raidz2-0"},
           "sdb": {"pool": "fast", "vdev": "mirror-0"}}
     """
+    cached = await cache_get("jbod:zfs_map")
+    if cached is not None:
+        return cached
+
     pool_map = {}
     try:
         # When running in a container with pid:host, use nsenter to run
@@ -94,6 +102,8 @@ async def get_zfs_pool_map() -> dict[str, dict]:
                     pass
     except FileNotFoundError:
         logger.debug("zpool not available")
+
+    await cache_set("jbod:zfs_map", pool_map, ZFS_CACHE_TTL)
     return pool_map