diff --git a/controller/cmd/controller/main.go b/controller/cmd/controller/main.go
index 04a9df6..3d915e0 100644
--- a/controller/cmd/controller/main.go
+++ b/controller/cmd/controller/main.go
@@ -1401,12 +1401,21 @@ func main() {
 	stackMgr.RecoverMigration(ctx)
 	webServer.SetEncryptionKey(encKey)
 	webServer.SetAppExporter(appExporter)
-	// Disk-health degradation check (v0.169.0): every 6h, compare each physical disk's SMART verdict
-	// against the in-memory baseline and emit disk_health_degraded on a degradation only (first run
-	// baselines silently; recovery/UNKNOWN never notify). Only on a provisioned guest (an agent to
+	// Disk-health degradation check (v0.169.0; hourly + persisted state v0.215.0): compare each
+	// physical disk's SMART verdict against the PERSISTED per-disk record (disk_health_state.go) and
+	// emit disk_health_degraded per the v0.215.0 decision rules — escalation against the last ALERTED
+	// verdict, plus a re-alert for a disk already at Hiba that keeps worsening. A disk's first verdict
+	// baselines silently; recovery and UNKNOWN never notify. Only on a provisioned guest (an agent to
 	// read /disks from); the check no-ops gracefully if the agent is unreachable.
+	//
+	// WHY HOURLY, not the original 6h: the one real failing drive's benign excursion lasted about ONE
+	// HOUR (11 Aug 12:28 -> 13:28, cleared completely). A 6-hourly sampler can land either side of an
+	// excursion like that and see nothing, then catch the terminal run half a day late. Measured on
+	// demo-hp 2026-08-14, the real /disks fetch costs min 0.805s / median 0.821s / max 0.841s over 10
+	// calls (3 physical disk rows), so an hourly poll is ~0.02% duty — far under the 5s bar that would
+	// have kept this at 6h.
 	if cfg.LocalAPI.Endpoint != "" {
-		sched.Every("disk-health-check", 6*time.Hour, webServer.RunDiskHealthCheck)
+		sched.Every("disk-health-check", 1*time.Hour, webServer.RunDiskHealthCheck)
 	}
 	// Browser .fab upload (v0.128.0): upload state is in-memory, so a restart strands the .part —
 	// GC stray part files in every registered drive's exports dir at startup.