diff --git a/raftpb/raft.pb.go b/raftpb/raft.pb.go
index 1829dfc5..e1033908 100644
--- a/raftpb/raft.pb.go
+++ b/raftpb/raft.pb.go
@@ -72,25 +72,29 @@ func (EntryType) EnumDescriptor() ([]byte, []int) {
 type MessageType int32
 
 const (
-	MsgHup            MessageType = 0
-	MsgBeat           MessageType = 1
-	MsgProp           MessageType = 2
-	MsgApp            MessageType = 3
-	MsgAppResp        MessageType = 4
-	MsgVote           MessageType = 5
-	MsgVoteResp       MessageType = 6
-	MsgSnap           MessageType = 7
-	MsgHeartbeat      MessageType = 8
-	MsgHeartbeatResp  MessageType = 9
-	MsgUnreachable    MessageType = 10
-	MsgSnapStatus     MessageType = 11
-	MsgCheckQuorum    MessageType = 12
-	MsgTransferLeader MessageType = 13
-	MsgTimeoutNow     MessageType = 14
-	MsgReadIndex      MessageType = 15
-	MsgReadIndexResp  MessageType = 16
-	MsgPreVote        MessageType = 17
-	MsgPreVoteResp    MessageType = 18
+	MsgHup               MessageType = 0
+	MsgBeat              MessageType = 1
+	MsgProp              MessageType = 2
+	MsgApp               MessageType = 3
+	MsgAppResp           MessageType = 4
+	MsgVote              MessageType = 5
+	MsgVoteResp          MessageType = 6
+	MsgSnap              MessageType = 7
+	MsgHeartbeat         MessageType = 8
+	MsgHeartbeatResp     MessageType = 9
+	MsgUnreachable       MessageType = 10
+	MsgSnapStatus        MessageType = 11
+	MsgCheckQuorum       MessageType = 12
+	MsgTransferLeader    MessageType = 13
+	MsgTimeoutNow        MessageType = 14
+	MsgReadIndex         MessageType = 15
+	MsgReadIndexResp     MessageType = 16
+	MsgPreVote           MessageType = 17
+	MsgPreVoteResp       MessageType = 18
+	MsgStorageAppend     MessageType = 19
+	MsgStorageAppendResp MessageType = 20
+	MsgStorageApply      MessageType = 21
+	MsgStorageApplyResp  MessageType = 22
 )
 
 var MessageType_name = map[int32]string{
@@ -113,28 +117,36 @@ var MessageType_name = map[int32]string{
 	16: "MsgReadIndexResp",
 	17: "MsgPreVote",
 	18: "MsgPreVoteResp",
+	19: "MsgStorageAppend",
+	20: "MsgStorageAppendResp",
+	21: "MsgStorageApply",
+	22: "MsgStorageApplyResp",
 }
 
 var MessageType_value = map[string]int32{
-	"MsgHup":            0,
-	"MsgBeat":           1,
-	"MsgProp":           2,
-	"MsgApp":            3,
-	"MsgAppResp":        4,
-	"MsgVote":           5,
-	"MsgVoteResp":       6,
-	"MsgSnap":           7,
-	"MsgHeartbeat":      8,
-	"MsgHeartbeatResp":  9,
-	"MsgUnreachable":    10,
-	"MsgSnapStatus":     11,
-	"MsgCheckQuorum":    12,
-	"MsgTransferLeader": 13,
-	"MsgTimeoutNow":     14,
-	"MsgReadIndex":      15,
-	"MsgReadIndexResp":  16,
-	"MsgPreVote":        17,
-	"MsgPreVoteResp":    18,
+	"MsgHup":               0,
+	"MsgBeat":              1,
+	"MsgProp":              2,
+	"MsgApp":               3,
+	"MsgAppResp":           4,
+	"MsgVote":              5,
+	"MsgVoteResp":          6,
+	"MsgSnap":              7,
+	"MsgHeartbeat":         8,
+	"MsgHeartbeatResp":     9,
+	"MsgUnreachable":       10,
+	"MsgSnapStatus":        11,
+	"MsgCheckQuorum":       12,
+	"MsgTransferLeader":    13,
+	"MsgTimeoutNow":        14,
+	"MsgReadIndex":         15,
+	"MsgReadIndexResp":     16,
+	"MsgPreVote":           17,
+	"MsgPreVoteResp":       18,
+	"MsgStorageAppend":     19,
+	"MsgStorageAppendResp": 20,
+	"MsgStorageApply":      21,
+	"MsgStorageApplyResp":  22,
 }
 
 func (x MessageType) Enum() *MessageType {
@@ -386,14 +398,20 @@ type Message struct {
 	From uint64      `protobuf:"varint,3,opt,name=from" json:"from"`
 	Term uint64      `protobuf:"varint,4,opt,name=term" json:"term"`
 	// logTerm is generally used for appending Raft logs to followers. For example,
-	// (type=MsgApp,index=100,logTerm=5) means leader appends entries starting at
-	// index=101, and the term of entry at index 100 is 5.
+	// (type=MsgApp,index=100,logTerm=5) means the leader appends entries starting
+	// at index=101, and the term of the entry at index 100 is 5.
 	// (type=MsgAppResp,reject=true,index=100,logTerm=5) means follower rejects some
 	// entries from its leader as it already has an entry with term 5 at index 100.
+	// (type=MsgStorageAppendResp,index=100,logTerm=5) means the local node wrote
+	// entries up to index=100 in stable storage, and the term of the entry at index
+	// 100 was 5.
 	LogTerm uint64  `protobuf:"varint,5,opt,name=logTerm" json:"logTerm"`
 	Index   uint64  `protobuf:"varint,6,opt,name=index" json:"index"`
 	Entries []Entry `protobuf:"bytes,7,rep,name=entries" json:"entries"`
 	Commit  uint64  `protobuf:"varint,8,opt,name=commit" json:"commit"`
+	// hardState can be non-nil for MsgStorageAppend messages and is nil for all
+	// other message types.
+	HardState *HardState `protobuf:"bytes,13,opt,name=hardState" json:"hardState,omitempty"`
 	// snapshot is non-nil and non-empty for MsgSnap messages and nil for all other
 	// message types. However, peer nodes running older binary versions may send a
 	// non-nil, empty value for the snapshot field of non-MsgSnap messages. Code
@@ -402,6 +420,10 @@ type Message struct {
 	Reject     bool      `protobuf:"varint,10,opt,name=reject" json:"reject"`
 	RejectHint uint64    `protobuf:"varint,11,opt,name=rejectHint" json:"rejectHint"`
 	Context    []byte    `protobuf:"bytes,12,opt,name=context" json:"context,omitempty"`
+	// responses are populated by a raft node to instruct storage threads on how
+	// to respond and who to respond to when the work associated with a message
+	// is complete. Populated for MsgStorageAppend and MsgStorageApply messages.
+	Responses []Message `protobuf:"bytes,14,rep,name=responses" json:"responses"`
 }
 
 func (m *Message) Reset()         { *m = Message{} }
@@ -699,72 +721,76 @@ func init() {
 func init() { proto.RegisterFile("raft.proto", fileDescriptor_b042552c306ae59b) }
 
 var fileDescriptor_b042552c306ae59b = []byte{
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+	0x3e, 0x97, 0x86, 0x42, 0xb2, 0x04, 0xdd, 0xf9, 0x04, 0x71, 0x1b, 0x2a, 0x63, 0x1e, 0xe8, 0xee,
+	0x2e, 0x14, 0xc8, 0x14, 0xcc, 0xcb, 0x56, 0x7e, 0x58, 0xb6, 0x97, 0x50, 0xa1, 0x4c, 0x8a, 0x90,
+	0xc6, 0x5e, 0xa5, 0x53, 0xea, 0xd5, 0xfb, 0x8b, 0x33, 0x3d, 0x4e, 0x43, 0x19, 0x0d, 0x5e, 0x87,
+	0xf2, 0x88, 0x4f, 0x26, 0xa1, 0xf4, 0xaa, 0x85, 0x58, 0x06, 0xc3, 0x9f, 0x42, 0xed, 0x82, 0x08,
+	0x5f, 0x37, 0xcb, 0x5b, 0x9c, 0x6d, 0xeb, 0x5e, 0x4a, 0xe8, 0x33, 0xf6, 0x30, 0x57, 0xe2, 0x3e,
+	0x54, 0x63, 0x53, 0x68, 0xaf, 0xa6, 0x4f, 0xa1, 0xf9, 0x06, 0x98, 0x43, 0x99, 0x4e, 0x19, 0x11,
+	0xf4, 0x3b, 0x3a, 0x92, 0x1e, 0x74, 0xec, 0x5e, 0x35, 0x35, 0x92, 0x60, 0xf8, 0x39, 0x40, 0xb2,
+	0xda, 0x0b, 0x99, 0xf4, 0xea, 0x05, 0xab, 0x05, 0x5c, 0xd5, 0x6d, 0xc4, 0x99, 0xa4, 0x57, 0xd2,
+	0x6b, 0xa8, 0xef, 0xc1, 0x5c, 0x92, 0x82, 0xf8, 0x13, 0xa8, 0x09, 0x1a, 0x47, 0x9c, 0xc5, 0x34,
+	0xf6, 0x9a, 0xba, 0x3a, 0x4b, 0x73, 0x5d, 0x4d, 0xbf, 0xd1, 0x4c, 0xd7, 0xfd, 0x16, 0x6a, 0x59,
+	0xaa, 0x59, 0xcf, 0xec, 0x07, 0x3d, 0xf3, 0xc0, 0xbd, 0xe4, 0x92, 0xce, 0x8e, 0xa3, 0x42, 0x0a,
+	0x25, 0x2e, 0x3d, 0x2c, 0x71, 0xf7, 0x2f, 0x1b, 0x6a, 0xd9, 0x84, 0xe0, 0x55, 0x28, 0xab, 0x33,
+	0x22, 0xf6, 0xec, 0x4e, 0xa9, 0xe7, 0x0e, 0xcd, 0x0e, 0xaf, 0x41, 0x75, 0x4c, 0x89, 0x60, 0x8a,
+	0x71, 0x34, 0x93, 0xed, 0xf1, 0x0b, 0x58, 0x4a, 0x54, 0xa7, 0x7c, 0x2a, 0x03, 0x1e, 0xb2, 0xc0,
+	0x2b, 0x69, 0x49, 0x33, 0x81, 0xbf, 0x32, 0x28, 0x7e, 0x06, 0x8b, 0xe9, 0xa1, 0x53, 0xa6, 0x8a,
+	0xe4, 0x6a, 0x59, 0x23, 0x05, 0x0f, 0x55, 0x8d, 0x9e, 0x01, 0x90, 0xa9, 0xe4, 0xa7, 0x63, 0x4a,
+	0x2e, 0xa9, 0xfe, 0xfc, 0xd2, 0x5e, 0xd4, 0x14, 0x7e, 0xa0, 0xe0, 0xee, 0xef, 0x36, 0x80, 0x32,
+	0xbd, 0x73, 0x41, 0x58, 0x40, 0xf1, 0xc7, 0x66, 0x50, 0x1c, 0x3d, 0x28, 0xab, 0xc5, 0xc1, 0x4f,
+	0x14, 0x0f, 0x66, 0xe5, 0x05, 0x54, 0x18, 0xf7, 0xe9, 0x69, 0xe8, 0x9b, 0xa2, 0x34, 0x15, 0x79,
+	0xf7, 0xf6, 0x69, 0xf9, 0x90, 0xfb, 0x74, 0x7f, 0x77, 0x58, 0x56, 0xf4, 0xbe, 0x8f, 0xbd, 0xbc,
+	0xa5, 0xc9, 0x2b, 0x94, 0x35, 0x73, 0x0d, 0x9c, 0xd0, 0x37, 0x8d, 0x00, 0x73, 0xda, 0xd9, 0xdf,
+	0x1d, 0x3a, 0xa1, 0xdf, 0x9d, 0x00, 0xca, 0x2f, 0x3f, 0x0a, 0x59, 0x30, 0xce, 0x4d, 0xda, 0xff,
+	0xc5, 0xa4, 0xf3, 0x3e, 0x93, 0xdd, 0x3f, 0x6c, 0x68, 0xe4, 0x71, 0x4e, 0xfa, 0x78, 0x1b, 0x40,
+	0x0a, 0xc2, 0xe2, 0x50, 0x86, 0x9c, 0x99, 0x1b, 0xd7, 0x1f, 0xb9, 0x31, 0xd3, 0xa4, 0x1f, 0x73,
+	0x7e, 0x0a, 0x7f, 0x0e, 0x95, 0x91, 0x56, 0x25, 0x1d, 0x2f, 0x3c, 0x62, 0xf3, 0xa9, 0xa5, 0x33,
+	0x6d, 0xe4, 0xc5, 0x9a, 0x95, 0x66, 0x6a, 0xb6, 0xb1, 0x07, 0xb5, 0xec, 0xa5, 0xc7, 0x4b, 0x50,
+	0xd7, 0x9b, 0x43, 0x2e, 0x26, 0x64, 0x8c, 0x2c, 0xbc, 0x02, 0x4b, 0x1a, 0xc8, 0xe3, 0x23, 0x1b,
+	0x3f, 0x81, 0xe5, 0x39, 0xf0, 0xa4, 0x8f, 0x9c, 0x8d, 0x3f, 0x4b, 0x50, 0x2f, 0x3c, 0x84, 0x18,
+	0xa0, 0x3c, 0x88, 0x83, 0xbd, 0x69, 0x84, 0x2c, 0x5c, 0x87, 0xca, 0x20, 0x0e, 0xb6, 0x29, 0x91,
+	0xc8, 0x36, 0x9b, 0xd7, 0x82, 0x47, 0xc8, 0x31, 0xaa, 0xad, 0x28, 0x42, 0x25, 0xdc, 0x04, 0x48,
+	0xd6, 0x43, 0x1a, 0x47, 0xc8, 0x35, 0xc2, 0x13, 0x2e, 0x29, 0x5a, 0x50, 0xde, 0xcc, 0x46, 0xb3,
+	0x65, 0xc3, 0xaa, 0xd7, 0x03, 0x55, 0x30, 0x82, 0x86, 0xba, 0x8c, 0x12, 0x21, 0xcf, 0xd4, 0x2d,
+	0x55, 0xdc, 0x02, 0x54, 0x44, 0xf4, 0xa1, 0x1a, 0xc6, 0xd0, 0x1c, 0xc4, 0xc1, 0x1b, 0x26, 0x28,
+	0x19, 0x5d, 0x90, 0xb3, 0x31, 0x45, 0x80, 0x97, 0x61, 0xd1, 0x04, 0x52, 0x13, 0x37, 0x8d, 0x51,
+	0xdd, 0xc8, 0x76, 0x2e, 0xe8, 0xe8, 0xfb, 0xaf, 0xa7, 0x5c, 0x4c, 0x27, 0xa8, 0xa1, 0xd2, 0x1e,
+	0xc4, 0x81, 0x6e, 0xd0, 0x39, 0x15, 0x07, 0x94, 0xf8, 0x54, 0xa0, 0x45, 0x73, 0xfa, 0x38, 0x9c,
+	0x50, 0x3e, 0x95, 0x87, 0xfc, 0x07, 0xd4, 0x34, 0x66, 0x86, 0x94, 0xf8, 0xfa, 0x0f, 0x8b, 0x96,
+	0x8c, 0x99, 0x0c, 0xd1, 0x66, 0x90, 0xc9, 0xf7, 0xb5, 0xa0, 0x3a, 0xc5, 0x65, 0x73, 0xab, 0xd9,
+	0x6b, 0x0d, 0x36, 0x27, 0x8f, 0x24, 0x17, 0x24, 0xa0, 0x5b, 0x51, 0x44, 0x99, 0x8f, 0x56, 0xb0,
+	0x07, 0xad, 0x79, 0x54, 0xeb, 0x5b, 0xaa, 0x63, 0x33, 0xcc, 0xf8, 0x1a, 0x3d, 0xc1, 0xff, 0x83,
+	0x95, 0x39, 0x50, 0xab, 0x57, 0x37, 0x7e, 0xb6, 0xa1, 0xf5, 0xd8, 0xc7, 0x87, 0xd7, 0xc1, 0x7b,
+	0x0c, 0xdf, 0x9a, 0x4a, 0x8e, 0x2c, 0xfc, 0x01, 0xfc, 0xff, 0x31, 0xf6, 0x4b, 0x1e, 0x32, 0xb9,
+	0x3f, 0x89, 0xc6, 0xe1, 0x28, 0x54, 0x8d, 0x7e, 0x9f, 0xec, 0xd5, 0x95, 0x91, 0x39, 0x1b, 0xd7,
+	0xd0, 0x9c, 0x1d, 0x39, 0x55, 0xea, 0x1c, 0xd9, 0xf2, 0x7d, 0x35, 0x5c, 0xc8, 0x52, 0x59, 0xe7,
+	0xf0, 0x90, 0x4e, 0xf8, 0x25, 0xd5, 0x8c, 0x3d, 0xcb, 0xbc, 0x89, 0x7c, 0x22, 0x13, 0xc6, 0x99,
+	0x4d, 0x64, 0xcb, 0xf7, 0x0f, 0x92, 0x97, 0x4d, 0xb3, 0xa5, 0xed, 0xe7, 0x37, 0xef, 0xda, 0xd6,
+	0xed, 0xbb, 0xb6, 0x75, 0x73, 0xd7, 0xb6, 0x6f, 0xef, 0xda, 0xf6, 0x3f, 0x77, 0x6d, 0xfb, 0xd7,
+	0xfb, 0xb6, 0xf5, 0xdb, 0x7d, 0xdb, 0xba, 0xbd, 0x6f, 0x5b, 0x7f, 0xdf, 0xb7, 0xad, 0x7f, 0x03,
+	0x00, 0x00, 0xff, 0xff, 0x17, 0x42, 0x8c, 0x08, 0x8b, 0x09, 0x00, 0x00,
 }
 
 func (m *Entry) Marshal() (dAtA []byte, err error) {
@@ -905,6 +931,32 @@ func (m *Message) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if len(m.Responses) > 0 {
+		for iNdEx := len(m.Responses) - 1; iNdEx >= 0; iNdEx-- {
+			{
+				size, err := m.Responses[iNdEx].MarshalToSizedBuffer(dAtA[:i])
+				if err != nil {
+					return 0, err
+				}
+				i -= size
+				i = encodeVarintRaft(dAtA, i, uint64(size))
+			}
+			i--
+			dAtA[i] = 0x72
+		}
+	}
+	if m.HardState != nil {
+		{
+			size, err := m.HardState.MarshalToSizedBuffer(dAtA[:i])
+			if err != nil {
+				return 0, err
+			}
+			i -= size
+			i = encodeVarintRaft(dAtA, i, uint64(size))
+		}
+		i--
+		dAtA[i] = 0x6a
+	}
 	if m.Context != nil {
 		i -= len(m.Context)
 		copy(dAtA[i:], m.Context)
@@ -1263,6 +1315,16 @@ func (m *Message) Size() (n int) {
 		l = len(m.Context)
 		n += 1 + l + sovRaft(uint64(l))
 	}
+	if m.HardState != nil {
+		l = m.HardState.Size()
+		n += 1 + l + sovRaft(uint64(l))
+	}
+	if len(m.Responses) > 0 {
+		for _, e := range m.Responses {
+			l = e.Size()
+			n += 1 + l + sovRaft(uint64(l))
+		}
+	}
 	return n
 }
 
@@ -2045,6 +2107,76 @@ func (m *Message) Unmarshal(dAtA []byte) error {
 				m.Context = []byte{}
 			}
 			iNdEx = postIndex
+		case 13:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field HardState", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRaft
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthRaft
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthRaft
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.HardState == nil {
+				m.HardState = &HardState{}
+			}
+			if err := m.HardState.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 14:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Responses", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRaft
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthRaft
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthRaft
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Responses = append(m.Responses, Message{})
+			if err := m.Responses[len(m.Responses)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipRaft(dAtA[iNdEx:])
diff --git a/raftpb/raft.proto b/raftpb/raft.proto
index b3b49e58..35c763f1 100644
--- a/raftpb/raft.proto
+++ b/raftpb/raft.proto
@@ -41,25 +41,29 @@ message Snapshot {
 // For description of different message types, see:
 // https://pkg.go.dev/go.etcd.io/raft/v3#hdr-MessageType
 enum MessageType {
-	MsgHup             = 0;
-	MsgBeat            = 1;
-	MsgProp            = 2;
-	MsgApp             = 3;
-	MsgAppResp         = 4;
-	MsgVote            = 5;
-	MsgVoteResp        = 6;
-	MsgSnap            = 7;
-	MsgHeartbeat       = 8;
-	MsgHeartbeatResp   = 9;
-	MsgUnreachable     = 10;
-	MsgSnapStatus      = 11;
-	MsgCheckQuorum     = 12;
-	MsgTransferLeader  = 13;
-	MsgTimeoutNow      = 14;
-	MsgReadIndex       = 15;
-	MsgReadIndexResp   = 16;
-	MsgPreVote         = 17;
-	MsgPreVoteResp     = 18;
+	MsgHup               = 0;
+	MsgBeat              = 1;
+	MsgProp              = 2;
+	MsgApp               = 3;
+	MsgAppResp           = 4;
+	MsgVote              = 5;
+	MsgVoteResp          = 6;
+	MsgSnap              = 7;
+	MsgHeartbeat         = 8;
+	MsgHeartbeatResp     = 9;
+	MsgUnreachable       = 10;
+	MsgSnapStatus        = 11;
+	MsgCheckQuorum       = 12;
+	MsgTransferLeader    = 13;
+	MsgTimeoutNow        = 14;
+	MsgReadIndex         = 15;
+	MsgReadIndexResp     = 16;
+	MsgPreVote           = 17;
+	MsgPreVoteResp       = 18;
+	MsgStorageAppend     = 19;
+	MsgStorageAppendResp = 20;
+	MsgStorageApply      = 21;
+	MsgStorageApplyResp  = 22;
 	// NOTE: when adding new message types, remember to update the isLocalMsg and
 	// isResponseMsg arrays in raft/util.go and update the corresponding tests in
 	// raft/util_test.go.
@@ -71,14 +75,20 @@ message Message {
 	optional uint64      from        = 3  [(gogoproto.nullable) = false];
 	optional uint64      term        = 4  [(gogoproto.nullable) = false];
 	// logTerm is generally used for appending Raft logs to followers. For example,
-	// (type=MsgApp,index=100,logTerm=5) means leader appends entries starting at
-	// index=101, and the term of entry at index 100 is 5.
+	// (type=MsgApp,index=100,logTerm=5) means the leader appends entries starting
+	// at index=101, and the term of the entry at index 100 is 5.
 	// (type=MsgAppResp,reject=true,index=100,logTerm=5) means follower rejects some
 	// entries from its leader as it already has an entry with term 5 at index 100.
+	// (type=MsgStorageAppendResp,index=100,logTerm=5) means the local node wrote
+	// entries up to index=100 in stable storage, and the term of the entry at index
+	// 100 was 5.
 	optional uint64      logTerm     = 5  [(gogoproto.nullable) = false];
 	optional uint64      index       = 6  [(gogoproto.nullable) = false];
 	repeated Entry       entries     = 7  [(gogoproto.nullable) = false];
 	optional uint64      commit      = 8  [(gogoproto.nullable) = false];
+	// hardState can be non-nil for MsgStorageAppend messages and is nil for all
+	// other message types.
+	optional HardState   hardState   = 13 [(gogoproto.nullable) = true];
 	// snapshot is non-nil and non-empty for MsgSnap messages and nil for all other
 	// message types. However, peer nodes running older binary versions may send a
 	// non-nil, empty value for the snapshot field of non-MsgSnap messages. Code
@@ -86,7 +96,11 @@ message Message {
 	optional Snapshot    snapshot    = 9  [(gogoproto.nullable) = true];
 	optional bool        reject      = 10 [(gogoproto.nullable) = false];
 	optional uint64      rejectHint  = 11 [(gogoproto.nullable) = false];
-	optional bytes       context     = 12;
+	optional bytes       context     = 12 [(gogoproto.nullable) = true];
+	// responses are populated by a raft node to instruct storage threads on how
+	// to respond and who to respond to when the work associated with a message
+	// is complete. Populated for MsgStorageAppend and MsgStorageApply messages.
+	repeated Message     responses   = 14 [(gogoproto.nullable) = false];
 }
 
 message HardState {
diff --git a/raftpb/raft_test.go b/raftpb/raft_test.go
index 7057446c..7f5be88b 100644
--- a/raftpb/raft_test.go
+++ b/raftpb/raft_test.go
@@ -45,7 +45,7 @@ func TestProtoMemorySizes(t *testing.T) {
 	assert(unsafe.Sizeof(s), if64Bit(144, 80), "Snapshot")
 
 	var m Message
-	assert(unsafe.Sizeof(m), if64Bit(128, 92), "Message")
+	assert(unsafe.Sizeof(m), if64Bit(160, 108), "Message")
 
 	var hs HardState
 	assert(unsafe.Sizeof(hs), 24, "HardState")