Parallelize SMART health checks across drives with ThreadPoolExecutor

Runs SMART checks concurrently (up to 8 workers) instead of
sequentially, significantly reducing check time on multi-drive systems.
Results are collected and processed in original disk order.

Fixes: #22

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hwmonDaemon.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 import os, sys, json, requests, psutil, socket, subprocess, logging, argparse, urllib.request, re, glob, datetime, fcntl, textwrap, shutil
+from concurrent.futures import ThreadPoolExecutor, as_completed
 from typing import Dict, Any, List
 
 # =============================================================================
@@ -2790,6 +2791,20 @@ class SystemHealthMonitor:
                         device_partitions[base_dev] = []
                     device_partitions[base_dev].append(part)
 
+            # Run SMART checks in parallel across all drives
+            smart_results = {}
+            max_workers = min(8, len(physical_disks))
+            with ThreadPoolExecutor(max_workers=max_workers) as executor:
+                futures = {executor.submit(self._check_smart_health, disk): disk for disk in physical_disks}
+                for future in as_completed(futures):
+                    disk = futures[future]
+                    try:
+                        smart_results[disk] = future.result()
+                    except Exception as e:
+                        logger.error(f"SMART check failed for {disk}: {e}")
+                        smart_results[disk] = {'status': 'ERROR', 'issues': [str(e)], 'temp': None, 'attributes': {}}
+
+            # Build drive reports in original disk order
             overall_status = 'NORMAL'
             for disk in physical_disks:
                 drive_report = {
@@ -2825,8 +2840,8 @@ class SystemHealthMonitor:
                     if total_space > 0:
                         drive_report['usage_percent'] = (total_used / total_space) * 100
 
-                # Check SMART health
-                smart_health = self._check_smart_health(disk)
+                # Use pre-fetched SMART results
+                smart_health = smart_results.get(disk, {'status': 'ERROR', 'issues': [], 'temp': None, 'attributes': {}})
                 drive_report.update({
                     'smart_status': smart_health['status'],
                     'smart_issues': smart_health['issues'],