diff --git a/fdbclient/ServerKnobs.cpp b/fdbclient/ServerKnobs.cpp
index 81db2a85264..d9ed8eb35f9 100644
--- a/fdbclient/ServerKnobs.cpp
+++ b/fdbclient/ServerKnobs.cpp
@@ -192,8 +192,8 @@ void ServerKnobs::initialize(Randomize randomize, ClientKnobs* clientKnobs, IsSi
 	init( MAX_LARGE_SHARD_BYTES,                          1000000000 ); // 1G
 	init( SHARD_ENCODE_LOCATION_METADATA,                      false ); if( isSimulated ) SHARD_ENCODE_LOCATION_METADATA = deterministicRandom()->random01() < 0.75;
 	init( ENABLE_DD_PHYSICAL_SHARD,                            false ); // EXPERIMENTAL; If true, SHARD_ENCODE_LOCATION_METADATA must be true; When true, optimization of data move between DCs is disabled
-	init( DD_PHYSICAL_SHARD_MOVE_PROBABILITY,                    0.0 ); // FIXME: re-enable after ShardedRocksDB is well tested by simulation
-	init( ENABLE_PHYSICAL_SHARD_MOVE_EXPERIMENT,               false ); // FIXME: re-enable after ShardedRocksDB is well tested by simulation
+	init( DD_PHYSICAL_SHARD_MOVE_PROBABILITY,                    0.0 ); if( isSimulated )  DD_PHYSICAL_SHARD_MOVE_PROBABILITY = 0.5;
+	init( ENABLE_PHYSICAL_SHARD_MOVE_EXPERIMENT,               false ); if( isSimulated )  ENABLE_PHYSICAL_SHARD_MOVE_EXPERIMENT = deterministicRandom()->coinflip();
 	init( MAX_PHYSICAL_SHARD_BYTES,                         10000000 ); // 10 MB; for ENABLE_DD_PHYSICAL_SHARD; smaller leads to larger number of physicalShard per storage server
  	init( PHYSICAL_SHARD_METRICS_DELAY,                        300.0 ); // 300 seconds; for ENABLE_DD_PHYSICAL_SHARD
 	init( ANONYMOUS_PHYSICAL_SHARD_TRANSITION_TIME,            600.0 ); if( randomize && BUGGIFY )  ANONYMOUS_PHYSICAL_SHARD_TRANSITION_TIME = 0.0; // 600 seconds; for ENABLE_DD_PHYSICAL_SHARD