diff --git a/src/mon/OSDMonitor.cc b/src/mon/OSDMonitor.cc
index d0d5131ee15..c83d417ac5c 100644
--- a/src/mon/OSDMonitor.cc
+++ b/src/mon/OSDMonitor.cc
@@ -456,7 +456,7 @@ void OSDMonitor::handle_conf_change(const ConfigProxy& conf,
            << g_conf()->mon_memory_target
            << " rocksdb_cache_size:"
            << g_conf()->rocksdb_cache_size
-           << ". Invalid size provided."
+           << ". Unable to update cache size."
            << dendl;
     }
   }
@@ -492,6 +492,11 @@ int OSDMonitor::_update_mon_cache_settings()
     return -EINVAL;
   }
 
+  if (pcm == nullptr && rocksdb_binned_kv_cache == nullptr) {
+    derr << __func__ << " not using pcm and rocksdb" << dendl;
+    return -EINVAL;
+  }
+
   uint64_t old_mon_memory_target = mon_memory_target;
   uint64_t old_rocksdb_cache_size = rocksdb_cache_size;
 
@@ -530,7 +535,7 @@ int OSDMonitor::_update_mon_cache_settings()
     pcm->tune_memory();
     pcm->balance();
     _set_new_cache_sizes();
-    dout(10) << __func__ << " Updated mon cache setting."
+    dout(1) << __func__ << " Updated mon cache setting."
              << " target: " << target
              << " min: " << min
              << " max: " << max
@@ -933,7 +938,7 @@ int OSDMonitor::register_cache_with_pcm()
   pcm->insert("kv", rocksdb_binned_kv_cache, true);
   pcm->insert("inc", inc_cache, true);
   pcm->insert("full", full_cache, true);
-  dout(10) << __func__ << " pcm target: " << target
+  dout(1) << __func__ << " pcm target: " << target
            << " pcm max: " << max
            << " pcm min: " << min
            << " inc_osd_cache size: " << inc_osd_cache.get_size()
@@ -959,7 +964,7 @@ int OSDMonitor::_set_cache_ratios()
   inc_cache->set_cache_ratio(cache_inc_ratio);
   full_cache->set_cache_ratio(cache_full_ratio);
 
-  dout(10) << __func__ << " kv ratio " << cache_kv_ratio
+  dout(1) << __func__ << " kv ratio " << cache_kv_ratio
            << " inc ratio " << cache_inc_ratio
            << " full ratio " << cache_full_ratio
            << dendl;
@@ -5096,7 +5101,7 @@ void OSDMonitor::_set_new_cache_sizes()
   inc_osd_cache.set_bytes(inc_alloc);
   full_osd_cache.set_bytes(full_alloc);
 
-  dout(10) << __func__ << " cache_size:" << cache_size
+  dout(1) << __func__ << " cache_size:" << cache_size
            << " inc_alloc: " << inc_alloc
            << " full_alloc: " << full_alloc
            << " kv_alloc: " << kv_alloc