updated get_ram_and_disk method

agent.py

@@ -145,13 +145,14 @@ class ServerData:
         for device in os.listdir('/sys/block'):
             device_path = '/sys/block/{}/device'.format(device)
             size_path = '/sys/block/{}/size'.format(device)
-            if os.path.islink(device_path):
-                try:
-                    with open(size_path, 'r') as f:
-                        size = int(f.read().strip())
-                        disk += size
-                except Exception:
-                    pass  # Skip the device if any exception occurs
+            if not os.path.islink(device_path):
+                continue
+            try:
+                with open(size_path, 'r') as f:
+                    size = int(f.read().strip())
+                    disk += size
+            except Exception:
+                pass
 
         disk = disk * 512 // (1024**3)  # convert to GB
         logging.info("RAM: {}MB, Disk: {}GB".format(ram, disk))