qa/suites/rbd/persistent-writeback-cache: add test case

Add the test case which size is 8GB, So that some problems that occur
only in test scenarios above 4GB may be found in this test. For example,
the variables of 32-bit may be unexpected value when it operates with
a 64 bit value.

Signed-off-by: Yin Congmin <congmin.yin@intel.com>

diff --git a/qa/suites/rbd/persistent-writeback-cache/4-pool/big-cache.yaml b/qa/suites/rbd/persistent-writeback-cache/4-pool/big-cache.yaml
new file mode 100644 (file)
index 0000000..7ac3f31
--- /dev/null
+++ b/qa/suites/rbd/persistent-writeback-cache/4-pool/big-cache.yaml
@@ -0,0 +1,15 @@
+overrides:
+  ceph:
+    conf:
+      client:
+        rbd_persistent_cache_path: /home/ubuntu/cephtest/write_back_cache
+        rbd_persistent_cache_size: 8589934592
+        rbd_plugins: pwl_cache
+        rbd_default_features: 61
+tasks:
+- exec:
+    client.0:
+      - "mkdir -m 777 /home/ubuntu/cephtest/write_back_cache"
+- exec_on_cleanup:
+    client.0:
+      - "rm -rf /home/ubuntu/cephtest/write_back_cache"