qa: fix test_cephfs_mirror_stats failure

* Don't create huge files that results in 'No space left on device'.
* Relax last_synced_end > last_synced_start check, so that
  the test wouldn't fail even if 'counter dump' delays getting updated
  values within a particular snapshot sync.

Fixes: https://tracker.ceph.com/issues/71186
Signed-off-by: Jos Collin <[email protected]>

Author: joscollin

qa/tasks/cephfs/test_mirroring.py

@@ -589,7 +589,7 @@ def test_cephfs_mirror_stats(self):
         # create a bunch of files in a directory to snap
         self.mount_a.run_shell(["mkdir", "d0"])
         for i in range(10):
-            self.mount_a.write_n_mb(os.path.join('d0', f'file.{i}'), 1024)
+            self.mount_a.write_n_mb(os.path.join('d0', f'file.{i}'), 100)
 
         time.sleep(60)
         self.enable_mirroring(self.primary_fs_name, self.primary_fs_id)
@@ -603,7 +603,7 @@ def test_cephfs_mirror_stats(self):
         # take a snapshot
         self.mount_a.run_shell(["mkdir", "d0/.snap/snap0"])
 
-        time.sleep(500)
+        time.sleep(120)
         self.check_peer_status(self.primary_fs_name, self.primary_fs_id,
                                "client.mirror_remote@ceph", '/d0', 'snap0', 1)
         self.verify_snapshot('d0', 'snap0')
@@ -613,20 +613,20 @@ def test_cephfs_mirror_stats(self):
         second = res[TestMirroring.PERF_COUNTER_KEY_NAME_CEPHFS_MIRROR_PEER][0]
         self.assertGreater(second["counters"]["snaps_synced"], first["counters"]["snaps_synced"])
         self.assertGreater(second["counters"]["last_synced_start"], first["counters"]["last_synced_start"])
-        self.assertGreater(second["counters"]["last_synced_end"], second["counters"]["last_synced_start"])
+        self.assertGreaterEqual(second["counters"]["last_synced_end"], second["counters"]["last_synced_start"])
         self.assertGreater(second["counters"]["last_synced_duration"], 0)
-        self.assertEquals(second["counters"]["last_synced_bytes"], 10737418240) # last_synced_bytes = 10 files of 1024MB size each
+        self.assertEquals(second["counters"]["last_synced_bytes"], 1048576000) # last_synced_bytes = 10 files of 100MB size each
 
         # some more IO
-        for i in range(10):
-            self.mount_a.write_n_mb(os.path.join('d0', f'more_file.{i}'), 1024)
+        for i in range(15):
+            self.mount_a.write_n_mb(os.path.join('d0', f'more_file.{i}'), 100)
 
         time.sleep(60)
 
         # take another snapshot
         self.mount_a.run_shell(["mkdir", "d0/.snap/snap1"])
 
-        time.sleep(500)
+        time.sleep(240)
         self.check_peer_status(self.primary_fs_name, self.primary_fs_id,
                                "client.mirror_remote@ceph", '/d0', 'snap1', 2)
         self.verify_snapshot('d0', 'snap1')
@@ -636,9 +636,9 @@ def test_cephfs_mirror_stats(self):
         third = res[TestMirroring.PERF_COUNTER_KEY_NAME_CEPHFS_MIRROR_PEER][0]
         self.assertGreater(third["counters"]["snaps_synced"], second["counters"]["snaps_synced"])
         self.assertGreater(third["counters"]["last_synced_start"], second["counters"]["last_synced_end"])
-        self.assertGreater(third["counters"]["last_synced_end"], third["counters"]["last_synced_start"])
+        self.assertGreaterEqual(third["counters"]["last_synced_end"], third["counters"]["last_synced_start"])
         self.assertGreater(third["counters"]["last_synced_duration"], 0)
-        self.assertEquals(third["counters"]["last_synced_bytes"], 10737418240) # last_synced_bytes = 10 files of 1024MB size each
+        self.assertEquals(third["counters"]["last_synced_bytes"], 1572864000) # last_synced_bytes = 15 files of 100MB size each
 
         # delete a snapshot
         self.mount_a.run_shell(["rmdir", "d0/.snap/snap0"])