diff --git a/gns3server/handlers/api/compute/server_handler.py b/gns3server/handlers/api/compute/server_handler.py
index 74d64d10..5a30ac8c 100644
--- a/gns3server/handlers/api/compute/server_handler.py
+++ b/gns3server/handlers/api/compute/server_handler.py
@@ -24,6 +24,7 @@ from gns3server.schemas.version import VERSION_SCHEMA
 from gns3server.schemas.server_statistics import SERVER_STATISTICS_SCHEMA
 from gns3server.compute.port_manager import PortManager
 from gns3server.utils.cpu_percent import CpuPercent
+from gns3server.utils.path import get_default_project_directory, get_mountpoint
 from gns3server.version import __version__
 from aiohttp.web import HTTPConflict
 
@@ -61,7 +62,8 @@ class ServerHandler:
             load_average_percent = [int(x / psutil.cpu_count() * 100) for x in psutil.getloadavg()]
             memory_percent = int(psutil.virtual_memory().percent)
             swap_percent = int(psutil.swap_memory().percent)
-            disk_usage_percent = int(psutil.disk_usage('/').percent)
+            project_dir_mountpoint = get_mountpoint(get_default_project_directory())
+            disk_usage_percent = int(psutil.disk_usage(project_dir_mountpoint).percent)
         except psutil.Error as e:
             raise HTTPConflict(text="Psutil error detected: {}".format(e))
         response.json({"memory_total": memory_total,
diff --git a/gns3server/utils/path.py b/gns3server/utils/path.py
index e3360010..f5e9a057 100644
--- a/gns3server/utils/path.py
+++ b/gns3server/utils/path.py
@@ -48,7 +48,7 @@ def is_safe_path(file_path: str, basedir: str) -> bool:
     return Path(basedir).resolve() in test_path.resolve().parents
 
 
-def check_path_allowed(path):
+def check_path_allowed(path: str):
     """
     If the server is non local raise an error if
     the path is outside project directories
@@ -64,3 +64,16 @@ def check_path_allowed(path):
 
     if "local" in config and config.getboolean("local") is False:
         raise aiohttp.web.HTTPForbidden(text="The path is not allowed")
+
+
+def get_mountpoint(path: str):
+    """
+    Find the mount point of a path.
+    """
+
+    path = os.path.abspath(path)
+    while path != os.path.sep:
+        if os.path.ismount(path):
+            return path
+        path = os.path.abspath(os.path.join(path, os.pardir))
+    return path