storage: skip NFSv4 large VDI tests due to known performance issue

Skip test_coalesce and test_vdi_export_import when running on NFSv4 with
VDI size > 20 GiB, as NFSv4 performance issues make these tests too slow.

Signed-off-by: Gaëtan Lehmann <gaetan.lehmann@vates.tech>

Author: glehmann

tests/storage/nfs/test_nfs_sr.py

@@ -2,8 +2,9 @@
 
 import pytest
 
+from lib import config
 from lib.commands import SSHCommandFailed
-from lib.common import Defer, vm_image, wait_for
+from lib.common import Defer, GiB, vm_image, wait_for
 from lib.sr import SR
 from lib.vdi import VDI
 from lib.vm import VM
@@ -120,6 +121,11 @@ def test_snapshot(self, dispatch_nfs):
     def test_coalesce(
         self, storage_test_vm: VM, dispatch_nfs: VDI, vdi_op: CoalesceOperation, defer: Defer
     ):
+        sr_name = dispatch_nfs.sr.pool.master.xe(
+            'sr-param-get', {'uuid': dispatch_nfs.sr.uuid, 'param-name': 'name-label'}
+        )
+        if "NFS4" in sr_name and config.volume_size > 20 * GiB:
+            pytest.skip("Skipping NFSv4 large VDI test (known performance issue)")
         coalesce_integrity(storage_test_vm, dispatch_nfs, vdi_op, defer)
 
     @pytest.mark.small_vm
@@ -146,6 +152,9 @@ def test_xva_export_import(self, dispatch_nfs: VM, compression: XVACompression,
     def test_vdi_export_import(
         self, storage_test_vm: VM, dispatch_nfs: SR, image_format: ImageFormat, temp_large_dir: str, defer: Defer
     ):
+        sr_name = dispatch_nfs.pool.master.xe('sr-param-get', {'uuid': dispatch_nfs.uuid, 'param-name': 'name-label'})
+        if "NFS4" in sr_name and config.volume_size > 20 * GiB:
+            pytest.skip("Skipping NFSv4 large VDI test (known performance issue)")
         vdi_export_import(storage_test_vm, dispatch_nfs, image_format, temp_large_dir, defer)
 
     # *** tests with reboots (longer tests).