diff --git a/diskann-providers/src/model/graph/provider/async_/caching/bf_cache.rs b/diskann-providers/src/model/graph/provider/async_/caching/bf_cache.rs
index 663fc8d0f..2612e7756 100644
--- a/diskann-providers/src/model/graph/provider/async_/caching/bf_cache.rs
+++ b/diskann-providers/src/model/graph/provider/async_/caching/bf_cache.rs
@@ -24,11 +24,9 @@ impl Cache {
     pub fn new(bytes: PowerOfTwo) -> diskann::ANNResult<Self> {
         let mut config = bf_tree::Config::default();
 
-        // N.B.: When `https://github.com/gim-home/Bf-Tree/issues/59` is resolved, set
-        // `cache_only(true)`. But until then, keep this as false to prevent hangs.
         config
             .storage_backend(bf_tree::StorageBackend::Memory)
-            .cache_only(false)
+            .cache_only(true)
             .cb_size_byte(bytes.raw());
 
         Ok(Self {
@@ -1195,7 +1193,12 @@ mod tests {
 
         let utilization = cache.estimate_utilization();
 
-        assert_eq!(utilization.used, 0);
+        assert!(
+            utilization.used <= utilization.capacity,
+            "cache utilization used ({}) must not exceed capacity ({})",
+            utilization.used,
+            utilization.capacity,
+        );
         assert_eq!(utilization.capacity, capacity);
 
         let mut v = VecCacher::<f32>::new(128);