wwn should always be lowercase for consistency. It's used in the URL for pushing smart data.

collector/pkg/detect/devices_linux.go

@@ -42,4 +42,7 @@ func (d *Detect) wwnFallback(detectedDevice *models.Device) {
 		d.Logger.Debugf("WWN is empty, falling back to serial number: %s", detectedDevice.SerialNumber)
 		detectedDevice.WWN = detectedDevice.SerialNumber
 	}
+
+	//wwn must always be lowercase.
+	detectedDevice.WWN = strings.ToLower(detectedDevice.WWN)
 }