fix(monitor): place the Secure Gateway template on an active storage

AppImage/scripts/lvm_device_scope.py

@@ -9,20 +9,17 @@
 # Last Updated: 16/10/2026
 # ==========================================================
 # Description:
-# Applies the automatic disk-read policy to LVM metadata scans in both
-# Monitor readers. Excluded and idle disks receive no power-mode probe;
-# every device built on them is excluded too, and the scan's own reads
-# are not taken as activity. No eligible devices means no scan.
+# Applies the disk exclusions to LVM metadata scans in both Monitor
+# readers. Excluded disks receive no power-mode probe and a disk in
+# standby is not woken; every device built on them is excluded too. No
+# eligible devices means no scan.
 # ==========================================================
 
 import json
 import re
 import subprocess
-import threading
 
 _NAME = re.compile(r"[A-Za-z0-9._+-]+")
-_scan_lock = threading.Lock()
-_scanned_disks = set()
 
 
 def _topology():
@@ -116,14 +113,11 @@ def lvm_device_args(standby_check):
         excluded = excluded_disk_names()
         blocked = set()
         for disk in sorted(disks):
-            # Test policy first: even CHECK POWER MODE is forbidden for an
-            # excluded/idle disk. Some USB bridges do not honour -n standby.
+            # Test the exclusion first: even CHECK POWER MODE is forbidden
+            # for an excluded disk. Some USB bridges do not honour -n standby.
             if disk_read_policy(disk, excluded) != "read" or standby_check(disk):
                 blocked.add(disk)
         allowed = sorted(f"/dev/{name}" for name in volumes if not (_disks_under(name, parents) & blocked))
-        with _scan_lock:
-            _scanned_disks.clear()
-            _scanned_disks.update(disks - blocked)
         if not blocked:
             return []
         filters = _lvm_filters()
@@ -140,15 +134,3 @@ def lvm_device_args(standby_check):
         # Unavailable exclusions, topology or policy are not permission to
         # open devices that may have been deliberately excluded.
         return None
-
-
-def settle_scan_reads():
-    """The LVM scan reads the disks it is allowed to. Those reads are its
-    own, so they must not make an unused disk look busy at the next check."""
-    try:
-        from disk_temperature_history import settle_own_reads
-        with _scan_lock:
-            disks = set(_scanned_disks)
-        settle_own_reads(disks)
-    except Exception:
-        pass