fix: sync to x replace fuser with mtime check

ansible/inventory/group_vars/all.yaml

@@ -37,7 +37,7 @@ sync_to_x_source_dir: /mnt/ssd/data
 sync_to_x_destinations:
   - /mnt/external/data
   - /mnt/nas/data
-sync_to_x_rsync_bw_limit: 100m
+sync_to_x_rsync_bw_limit: 200m
 sync_to_x_timer_interval: 1min
 
 # Journald Configuration

ansible/roles/sync_to_x/defaults/main.yaml

@@ -9,6 +9,7 @@ sync_to_x_hostname: "{{ ansible_hostname }}"
 sync_to_x_rsync_bw_limit: 100m
 sync_to_x_timer_interval: 1min
 sync_to_x_free_space_limit_gb: 10
+sync_to_x_active_file_threshold_sec: 30
 
 # System paths
 sync_to_x_script_path: /opt/drs/service/sync_to_x/sync_to_x.sh

ansible/roles/sync_to_x/templates/sync_to_x.sh.j2

@@ -94,10 +94,18 @@ error_exit() {
     # Find mcap files (excluding metadata.yaml) and sort by modification time (oldest first)
     find "$SOURCE_DIR" -name "*.mcap" -type f -printf '%T@ %p\n' | sort -n | cut -d' ' -f2- | while read -r mcap_file; do
 
-        # Check if file is currently open by any process (e.g., recording is still active)
-        if fuser "$mcap_file" > /dev/null 2>&1; then
-             echo "Skipping active file (in use): $mcap_file"
-             continue
+        # Skip files modified within the threshold (i.e., recording is still active or
+        # just finished). Avoids fuser/lsof which cause excessive NFS stat() calls when
+        # SOURCE_DIR or DEST is on a NAS mount, leading to severe slowdowns.
+        # On stat failure, skip rather than proceeding — the file will be retried next tick.
+        if ! file_mtime=$(stat -c %Y "$mcap_file" 2>/dev/null); then
+            echo "Skipping (stat failed): $mcap_file"
+            continue
+        fi
+        now=$(date +%s)
+        if [ $((now - file_mtime)) -lt {{ sync_to_x_active_file_threshold_sec }} ]; then
+            echo "Skipping recently modified file (active within {{ sync_to_x_active_file_threshold_sec }}s): $mcap_file"
+            continue
         fi
 
         # Get relative path (to preserve directory structure)