diff --git a/src/kv/RocksDBStore.cc b/src/kv/RocksDBStore.cc
index a535179428a..7e1324371e6 100644
--- a/src/kv/RocksDBStore.cc
+++ b/src/kv/RocksDBStore.cc
@@ -34,6 +34,17 @@ using std::string;
 #undef dout_prefix
 #define dout_prefix *_dout << "rocksdb: "
 
+static rocksdb::SliceParts prepare_sliceparts(const bufferlist &bl, rocksdb::Slice *slices)
+{
+  unsigned n = 0;
+  for (std::list<buffer::ptr>::const_iterator p = bl.buffers().begin();
+       p != bl.buffers().end(); ++p, ++n) {
+    slices[n].data_ = p->c_str();
+    slices[n].size_ = p->length();
+  }
+  return rocksdb::SliceParts(slices, n);
+}
+
 //
 // One of these per rocksdb instance, implements the merge operator prefix stuff
 //
@@ -561,10 +572,10 @@ void RocksDBStore::RocksDBTransactionImpl::set(
 	     rocksdb::Slice(to_set_bl.buffers().front().c_str(),
 			    to_set_bl.length()));
   } else {
-    // make a copy
-    bufferlist val = to_set_bl;
-    bat.Put(rocksdb::Slice(key),
-	     rocksdb::Slice(val.c_str(), val.length()));
+    rocksdb::Slice key_slice(key);
+    rocksdb::Slice value_slices[to_set_bl.buffers().size()];
+    bat.Put(nullptr, rocksdb::SliceParts(&key_slice, 1),
+            prepare_sliceparts(to_set_bl, value_slices));
   }
 }
 
@@ -582,10 +593,10 @@ void RocksDBStore::RocksDBTransactionImpl::set(
 	     rocksdb::Slice(to_set_bl.buffers().front().c_str(),
 			    to_set_bl.length()));
   } else {
-    // make a copy
-    bufferlist val = to_set_bl;
-    bat.Put(rocksdb::Slice(key),
-	     rocksdb::Slice(val.c_str(), val.length()));
+    rocksdb::Slice key_slice(key);
+    rocksdb::Slice value_slices[to_set_bl.buffers().size()];
+    bat.Put(nullptr, rocksdb::SliceParts(&key_slice, 1),
+            prepare_sliceparts(to_set_bl, value_slices));
   }
 }
 
@@ -653,9 +664,10 @@ void RocksDBStore::RocksDBTransactionImpl::merge(
 			    to_set_bl.length()));
   } else {
     // make a copy
-    bufferlist val = to_set_bl;
-    bat.Merge(rocksdb::Slice(key),
-	     rocksdb::Slice(val.c_str(), val.length()));
+    rocksdb::Slice key_slice(key);
+    rocksdb::Slice value_slices[to_set_bl.buffers().size()];
+    bat.Merge(nullptr, rocksdb::SliceParts(&key_slice, 1),
+              prepare_sliceparts(to_set_bl, value_slices));
   }
 }
 
diff --git a/src/os/bluestore/BlueRocksEnv.cc b/src/os/bluestore/BlueRocksEnv.cc
index 3fcccc861dd..1b1e2e90357 100644
--- a/src/os/bluestore/BlueRocksEnv.cc
+++ b/src/os/bluestore/BlueRocksEnv.cc
@@ -97,16 +97,6 @@ class BlueRocksRandomAccessFile : public rocksdb::RandomAccessFile {
     return rocksdb::Status::OK();
   }
 
-  // Used by the file_reader_writer to decide if the ReadAhead wrapper
-  // should simply forward the call and do not enact buffering or locking.
-  bool ShouldForwardRawRequest() const override {
-    return false;
-  }
-
-  // For cases when read-ahead is implemented in the platform dependent
-  // layer
-  void EnableReadAhead() override {}
-
   // Tries to get an unique ID for this file that will be the same each time
   // the file is opened (and will stay the same while the file is open).
   // Furthermore, it tries to make this ID at most "max_size" bytes. If such an