diff --git a/client/status.go b/client/status.go
index 4824f2d..b42b069 100644
--- a/client/status.go
+++ b/client/status.go
@@ -177,13 +177,13 @@ func (t *tui) draw() {
 			}
 
 			for _, fs := range rep.Completed {
-				printFilesystem(fs, t)
+				printFilesystem(fs, t, false)
 			}
 			if rep.Active != nil {
-				printFilesystem(rep.Active, t)
+				printFilesystem(rep.Active, t, true)
 			}
 			for _, fs := range rep.Pending {
-				printFilesystem(fs, t)
+				printFilesystem(fs, t, false)
 			}
 
 		}
@@ -202,43 +202,51 @@ func rightPad(str string, length int, pad string) string {
 	return str + times(pad, length-len(str))
 }
 
-func (t *tui) drawBar(name string, status string, total int, done int, bytes int64) {
+func (t *tui) drawBar(name string, status string, bytes int64, totalBytes int64) {
 	t.write(rightPad(name, 20, " "))
 	t.write(" ")
 	t.write(rightPad(status, 20, " "))
 
-	if total > 0 {
+	if totalBytes > 0 {
 		length := 50
-		completedLength := length * done / total
+		completedLength := int(int64(length) * bytes / totalBytes)
 
 		t.write(times("=", completedLength))
 		t.write(">")
 		t.write(times("-", length-completedLength))
 
 		t.write(" ")
-		t.write(rightPad(ByteCountBinary(bytes), 8, " "))
-		t.printf(" %d/%d", done, total)
+		t.write(rightPad(ByteCountBinary(bytes) + "/" + ByteCountBinary(bytes), 16, " "))
 	}
 
 	t.newline()
 }
 
-func printFilesystem(rep *fsrep.Report, t *tui) {
+func printFilesystem(rep *fsrep.Report, t *tui, versions bool) {
 	bytes := int64(0)
+	totalBytes := int64(0)
 	for _, s := range rep.Pending {
 		bytes += s.Bytes
+		totalBytes += s.ExpectedBytes
 	}
 	for _, s := range rep.Completed {
 		bytes += s.Bytes
+		totalBytes += s.ExpectedBytes
 	}
 
-	t.drawBar(rep.Filesystem, rep.Status, len(rep.Completed)+len(rep.Pending), len(rep.Completed), bytes)
+	t.drawBar(rep.Filesystem, rep.Status, bytes, totalBytes)
 	if rep.Problem != "" {
 		t.addIndent(1)
 		t.printf("Problem: %s", rep.Problem)
 		t.newline()
 		t.addIndent(-1)
 	}
+	if versions {
+		vs := append(rep.Completed, rep.Pending...)
+		for _, v := range vs {
+			t.drawBar(" " + v.To, v.Status, v.Bytes, v.ExpectedBytes)
+		}
+	}
 }
 
 func ByteCountBinary(b int64) string {
diff --git a/endpoint/endpoint.go b/endpoint/endpoint.go
index 408a155..55c41c5 100644
--- a/endpoint/endpoint.go
+++ b/endpoint/endpoint.go
@@ -74,11 +74,17 @@ func (p *Sender) Send(ctx context.Context, r *pdu.SendReq) (*pdu.SendRes, io.Rea
 	if !pass {
 		return nil, nil, replication.NewFilteredError(r.Filesystem)
 	}
+
+	size, err := zfs.ZFSSendDry(r.Filesystem, r.From, r.To)
+	if err != nil {
+		return nil, nil, err
+	}
+
 	stream, err := zfs.ZFSSend(r.Filesystem, r.From, r.To)
 	if err != nil {
 		return nil, nil, err
 	}
-	return &pdu.SendRes{}, stream, nil
+	return &pdu.SendRes{ExpectedSize: size}, stream, nil
 }
 
 func (p *Sender) DestroySnapshots(ctx context.Context, req *pdu.DestroySnapshotsReq) (*pdu.DestroySnapshotsRes, error) {
diff --git a/replication/fsrep/fsfsm.go b/replication/fsrep/fsfsm.go
index 0bf7fb6..43bbf59 100644
--- a/replication/fsrep/fsfsm.go
+++ b/replication/fsrep/fsfsm.go
@@ -40,6 +40,7 @@ func getLogger(ctx context.Context) Logger {
 type Sender interface {
 	// If a non-nil io.ReadCloser is returned, it is guaranteed to be closed before
 	// any next call to the parent github.com/zrepl/zrepl/replication.Endpoint.
+	// returned int64 is the expected size of the stream
 	Send(ctx context.Context, r *pdu.SendReq) (*pdu.SendRes, io.ReadCloser, error)
 	SnapshotReplicationStatus(ctx context.Context, r *pdu.SnapshotReplicationStatusReq) (*pdu.SnapshotReplicationStatusRes, error)
 }
@@ -58,6 +59,7 @@ type StepReport struct {
 	Status   string
 	Problem  string
 	Bytes    int64
+	ExpectedBytes int64
 }
 
 type Report struct {
@@ -169,8 +171,10 @@ type ReplicationStep struct {
 	parent   *Replication
 
 	// both retry and permanent error
-	err         error
-	byteCounter *util.ByteCounterReader
+	err error
+
+	byteCounter  *util.ByteCounterReader
+	expectedSize int64
 }
 
 func (f *Replication) TakeStep(ctx context.Context, sender Sender, receiver Receiver) (post State, nextStepDate time.Time) {
@@ -365,6 +369,7 @@ func (s *ReplicationStep) doReplication(ctx context.Context, sender Sender, rece
 		return updateStateError(err)
 	}
 
+	s.expectedSize = sres.ExpectedSize
 	s.byteCounter = util.NewByteCounterReader(sstream)
 	sstream = s.byteCounter
 
@@ -459,6 +464,7 @@ func (s *ReplicationStep) Report() *StepReport {
 		To:     s.to.RelName(),
 		Status: s.state.String(),
 		Bytes:  bytes,
+		ExpectedBytes: s.expectedSize,
 	}
 	return &rep
 }
diff --git a/replication/pdu/pdu.pb.go b/replication/pdu/pdu.pb.go
index db361c3..3ca7077 100644
--- a/replication/pdu/pdu.pb.go
+++ b/replication/pdu/pdu.pb.go
@@ -38,7 +38,7 @@ func (x FilesystemVersion_VersionType) String() string {
 	return proto.EnumName(FilesystemVersion_VersionType_name, int32(x))
 }
 func (FilesystemVersion_VersionType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{5, 0}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{5, 0}
 }
 
 type SnapshotReplicationStatusReq_Op int32
@@ -61,7 +61,7 @@ func (x SnapshotReplicationStatusReq_Op) String() string {
 	return proto.EnumName(SnapshotReplicationStatusReq_Op_name, int32(x))
 }
 func (SnapshotReplicationStatusReq_Op) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{14, 0}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{14, 0}
 }
 
 type ListFilesystemReq struct {
@@ -74,7 +74,7 @@ func (m *ListFilesystemReq) Reset()         { *m = ListFilesystemReq{} }
 func (m *ListFilesystemReq) String() string { return proto.CompactTextString(m) }
 func (*ListFilesystemReq) ProtoMessage()    {}
 func (*ListFilesystemReq) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{0}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{0}
 }
 func (m *ListFilesystemReq) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListFilesystemReq.Unmarshal(m, b)
@@ -105,7 +105,7 @@ func (m *ListFilesystemRes) Reset()         { *m = ListFilesystemRes{} }
 func (m *ListFilesystemRes) String() string { return proto.CompactTextString(m) }
 func (*ListFilesystemRes) ProtoMessage()    {}
 func (*ListFilesystemRes) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{1}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{1}
 }
 func (m *ListFilesystemRes) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListFilesystemRes.Unmarshal(m, b)
@@ -144,7 +144,7 @@ func (m *Filesystem) Reset()         { *m = Filesystem{} }
 func (m *Filesystem) String() string { return proto.CompactTextString(m) }
 func (*Filesystem) ProtoMessage()    {}
 func (*Filesystem) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{2}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{2}
 }
 func (m *Filesystem) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Filesystem.Unmarshal(m, b)
@@ -189,7 +189,7 @@ func (m *ListFilesystemVersionsReq) Reset()         { *m = ListFilesystemVersion
 func (m *ListFilesystemVersionsReq) String() string { return proto.CompactTextString(m) }
 func (*ListFilesystemVersionsReq) ProtoMessage()    {}
 func (*ListFilesystemVersionsReq) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{3}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{3}
 }
 func (m *ListFilesystemVersionsReq) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListFilesystemVersionsReq.Unmarshal(m, b)
@@ -227,7 +227,7 @@ func (m *ListFilesystemVersionsRes) Reset()         { *m = ListFilesystemVersion
 func (m *ListFilesystemVersionsRes) String() string { return proto.CompactTextString(m) }
 func (*ListFilesystemVersionsRes) ProtoMessage()    {}
 func (*ListFilesystemVersionsRes) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{4}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{4}
 }
 func (m *ListFilesystemVersionsRes) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListFilesystemVersionsRes.Unmarshal(m, b)
@@ -269,7 +269,7 @@ func (m *FilesystemVersion) Reset()         { *m = FilesystemVersion{} }
 func (m *FilesystemVersion) String() string { return proto.CompactTextString(m) }
 func (*FilesystemVersion) ProtoMessage()    {}
 func (*FilesystemVersion) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{5}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{5}
 }
 func (m *FilesystemVersion) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_FilesystemVersion.Unmarshal(m, b)
@@ -348,7 +348,7 @@ func (m *SendReq) Reset()         { *m = SendReq{} }
 func (m *SendReq) String() string { return proto.CompactTextString(m) }
 func (*SendReq) ProtoMessage()    {}
 func (*SendReq) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{6}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{6}
 }
 func (m *SendReq) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SendReq.Unmarshal(m, b)
@@ -422,7 +422,7 @@ func (m *Property) Reset()         { *m = Property{} }
 func (m *Property) String() string { return proto.CompactTextString(m) }
 func (*Property) ProtoMessage()    {}
 func (*Property) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{7}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{7}
 }
 func (m *Property) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Property.Unmarshal(m, b)
@@ -458,8 +458,10 @@ func (m *Property) GetValue() string {
 
 type SendRes struct {
 	// Whether the resume token provided in the request has been used or not.
-	UsedResumeToken      bool        `protobuf:"varint,1,opt,name=UsedResumeToken,proto3" json:"UsedResumeToken,omitempty"`
-	Properties           []*Property `protobuf:"bytes,2,rep,name=Properties,proto3" json:"Properties,omitempty"`
+	UsedResumeToken bool `protobuf:"varint,1,opt,name=UsedResumeToken,proto3" json:"UsedResumeToken,omitempty"`
+	// Expected stream size determined by dry run, not exact
+	ExpectedSize         int64       `protobuf:"varint,2,opt,name=ExpectedSize,proto3" json:"ExpectedSize,omitempty"`
+	Properties           []*Property `protobuf:"bytes,3,rep,name=Properties,proto3" json:"Properties,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}    `json:"-"`
 	XXX_unrecognized     []byte      `json:"-"`
 	XXX_sizecache        int32       `json:"-"`
@@ -469,7 +471,7 @@ func (m *SendRes) Reset()         { *m = SendRes{} }
 func (m *SendRes) String() string { return proto.CompactTextString(m) }
 func (*SendRes) ProtoMessage()    {}
 func (*SendRes) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{8}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{8}
 }
 func (m *SendRes) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SendRes.Unmarshal(m, b)
@@ -496,6 +498,13 @@ func (m *SendRes) GetUsedResumeToken() bool {
 	return false
 }
 
+func (m *SendRes) GetExpectedSize() int64 {
+	if m != nil {
+		return m.ExpectedSize
+	}
+	return 0
+}
+
 func (m *SendRes) GetProperties() []*Property {
 	if m != nil {
 		return m.Properties
@@ -516,7 +525,7 @@ func (m *ReceiveReq) Reset()         { *m = ReceiveReq{} }
 func (m *ReceiveReq) String() string { return proto.CompactTextString(m) }
 func (*ReceiveReq) ProtoMessage()    {}
 func (*ReceiveReq) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{9}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{9}
 }
 func (m *ReceiveReq) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ReceiveReq.Unmarshal(m, b)
@@ -560,7 +569,7 @@ func (m *ReceiveRes) Reset()         { *m = ReceiveRes{} }
 func (m *ReceiveRes) String() string { return proto.CompactTextString(m) }
 func (*ReceiveRes) ProtoMessage()    {}
 func (*ReceiveRes) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{10}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{10}
 }
 func (m *ReceiveRes) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ReceiveRes.Unmarshal(m, b)
@@ -593,7 +602,7 @@ func (m *DestroySnapshotsReq) Reset()         { *m = DestroySnapshotsReq{} }
 func (m *DestroySnapshotsReq) String() string { return proto.CompactTextString(m) }
 func (*DestroySnapshotsReq) ProtoMessage()    {}
 func (*DestroySnapshotsReq) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{11}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{11}
 }
 func (m *DestroySnapshotsReq) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DestroySnapshotsReq.Unmarshal(m, b)
@@ -639,7 +648,7 @@ func (m *DestroySnapshotRes) Reset()         { *m = DestroySnapshotRes{} }
 func (m *DestroySnapshotRes) String() string { return proto.CompactTextString(m) }
 func (*DestroySnapshotRes) ProtoMessage()    {}
 func (*DestroySnapshotRes) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{12}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{12}
 }
 func (m *DestroySnapshotRes) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DestroySnapshotRes.Unmarshal(m, b)
@@ -684,7 +693,7 @@ func (m *DestroySnapshotsRes) Reset()         { *m = DestroySnapshotsRes{} }
 func (m *DestroySnapshotsRes) String() string { return proto.CompactTextString(m) }
 func (*DestroySnapshotsRes) ProtoMessage()    {}
 func (*DestroySnapshotsRes) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{13}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{13}
 }
 func (m *DestroySnapshotsRes) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DestroySnapshotsRes.Unmarshal(m, b)
@@ -724,7 +733,7 @@ func (m *SnapshotReplicationStatusReq) Reset()         { *m = SnapshotReplicatio
 func (m *SnapshotReplicationStatusReq) String() string { return proto.CompactTextString(m) }
 func (*SnapshotReplicationStatusReq) ProtoMessage()    {}
 func (*SnapshotReplicationStatusReq) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{14}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{14}
 }
 func (m *SnapshotReplicationStatusReq) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SnapshotReplicationStatusReq.Unmarshal(m, b)
@@ -776,7 +785,7 @@ func (m *SnapshotReplicationStatusRes) Reset()         { *m = SnapshotReplicatio
 func (m *SnapshotReplicationStatusRes) String() string { return proto.CompactTextString(m) }
 func (*SnapshotReplicationStatusRes) ProtoMessage()    {}
 func (*SnapshotReplicationStatusRes) Descriptor() ([]byte, []int) {
-	return fileDescriptor_pdu_e1dccbd3b8cde5a3, []int{15}
+	return fileDescriptor_pdu_cc43fc3f9f8b50e6, []int{15}
 }
 func (m *SnapshotReplicationStatusRes) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SnapshotReplicationStatusRes.Unmarshal(m, b)
@@ -824,46 +833,47 @@ func init() {
 	proto.RegisterEnum("pdu.SnapshotReplicationStatusReq_Op", SnapshotReplicationStatusReq_Op_name, SnapshotReplicationStatusReq_Op_value)
 }
 
-func init() { proto.RegisterFile("pdu.proto", fileDescriptor_pdu_e1dccbd3b8cde5a3) }
+func init() { proto.RegisterFile("pdu.proto", fileDescriptor_pdu_cc43fc3f9f8b50e6) }
 
-var fileDescriptor_pdu_e1dccbd3b8cde5a3 = []byte{
-	// 595 bytes of a gzipped FileDescriptorProto
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-	0x0c, 0xa0, 0x5f, 0x1f, 0x2b, 0x46, 0x7f, 0x69, 0x6a, 0xba, 0x01, 0xf3, 0x24, 0xbf, 0xcb, 0x17,
-	0x26, 0xfe, 0xa6, 0x14, 0x96, 0xf3, 0xe8, 0x1f, 0x07, 0xce, 0x4a, 0x87, 0x98, 0x47, 0x77, 0x66,
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-	0xda, 0x01, 0x77, 0x2c, 0x48, 0x0d, 0x2a, 0x23, 0xd4, 0xc7, 0xd6, 0x86, 0xc3, 0x09, 0x16, 0x7f,
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-	0x05, 0x00, 0x00,
+var fileDescriptor_pdu_cc43fc3f9f8b50e6 = []byte{
+	// 616 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0x54, 0xdb, 0x6e, 0x13, 0x3d,
+	0x10, 0xfe, 0x77, 0x37, 0x6d, 0x37, 0x93, 0x1e, 0x52, 0xb7, 0xfa, 0x59, 0xaa, 0x0a, 0x45, 0x16,
+	0x17, 0x01, 0x89, 0x48, 0x84, 0x8a, 0x1b, 0x24, 0x2e, 0x7a, 0xe4, 0x02, 0xd1, 0xca, 0x09, 0x55,
+	0xaf, 0x90, 0x96, 0xee, 0x48, 0x5d, 0x25, 0x1b, 0xbb, 0xb6, 0x17, 0x11, 0x1e, 0x80, 0xf7, 0xe0,
+	0x15, 0x78, 0x1a, 0x1e, 0x07, 0xd9, 0xd9, 0x83, 0x9b, 0x94, 0x28, 0x57, 0xeb, 0xf9, 0xe6, 0xdb,
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+	0x7b, 0xb0, 0xfb, 0x31, 0x55, 0xfa, 0x3c, 0x1d, 0xa3, 0x9a, 0x2a, 0x8d, 0x19, 0xc3, 0x7b, 0x7a,
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+	0xeb, 0x78, 0xdd, 0x26, 0xb3, 0x67, 0xd2, 0x81, 0x16, 0x43, 0x95, 0x67, 0x38, 0xe4, 0x23, 0x9c,
+	0x44, 0xbe, 0x75, 0xb9, 0x10, 0x7d, 0x07, 0x4f, 0x1f, 0x6a, 0xb9, 0x46, 0xa9, 0x52, 0x3e, 0x51,
+	0x0c, 0xef, 0xc9, 0x33, 0x37, 0x41, 0x11, 0xd8, 0x41, 0xe8, 0xe5, 0xbf, 0x7f, 0x56, 0xa4, 0x0f,
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+	0x6e, 0xff, 0x67, 0xac, 0x63, 0xce, 0x47, 0x59, 0x2c, 0x47, 0x6d, 0x8f, 0xfe, 0xf2, 0x60, 0x63,
+	0x80, 0x93, 0x64, 0x85, 0xbe, 0x1a, 0x91, 0xe7, 0x92, 0x67, 0xa5, 0x70, 0x73, 0x26, 0xdb, 0xe0,
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+	0x42, 0xa2, 0x52, 0x56, 0x78, 0xc8, 0x2a, 0x9b, 0xec, 0xc3, 0xda, 0x29, 0x26, 0xb9, 0x88, 0xd6,
+	0xad, 0x63, 0x66, 0xd0, 0x23, 0x08, 0xaf, 0x24, 0x17, 0x28, 0xf5, 0xb4, 0x6a, 0x9e, 0xe7, 0x34,
+	0x6f, 0x1f, 0xd6, 0xae, 0xe3, 0x71, 0x5e, 0x76, 0x74, 0x66, 0xd0, 0x9f, 0x55, 0x65, 0x8a, 0x74,
+	0x61, 0xe7, 0xb3, 0xc2, 0xc4, 0x55, 0xe6, 0xd9, 0x0c, 0xf3, 0x30, 0xa1, 0xb0, 0x79, 0xf6, 0x5d,
+	0xe0, 0xad, 0xc6, 0x64, 0x90, 0xfe, 0x98, 0x85, 0x0c, 0xd8, 0x03, 0x8c, 0xbc, 0x02, 0x28, 0xf4,
+	0xa4, 0xa8, 0xa2, 0xc0, 0x5e, 0xa2, 0x2d, 0x3b, 0xfe, 0x52, 0x26, 0x73, 0x08, 0xf4, 0x06, 0x80,
+	0xe1, 0x2d, 0xa6, 0xdf, 0x70, 0x95, 0x26, 0xbf, 0x84, 0xf6, 0xc9, 0x18, 0x63, 0x39, 0xbf, 0x20,
+	0x21, 0x5b, 0xc0, 0xe9, 0xa6, 0x13, 0x59, 0xd1, 0x11, 0xec, 0x9d, 0xa2, 0xd2, 0x92, 0x4f, 0xcb,
+	0x69, 0xaf, 0xb2, 0x2d, 0xe4, 0x08, 0x9a, 0x15, 0x3f, 0xf2, 0x97, 0x6e, 0x44, 0x4d, 0xa4, 0x5f,
+	0x80, 0xcc, 0x25, 0x2b, 0x96, 0xab, 0x34, 0x6d, 0xa6, 0x25, 0xcb, 0x55, 0xf2, 0xcc, 0xf4, 0xce,
+	0xa4, 0xe4, 0xb2, 0x9c, 0x9e, 0x35, 0xe8, 0x87, 0xc7, 0x8a, 0x31, 0xcf, 0xd1, 0x86, 0x69, 0xc0,
+	0x58, 0x97, 0xcb, 0xfb, 0xc4, 0xc6, 0x5f, 0x94, 0xc2, 0x4a, 0x1e, 0xfd, 0xed, 0xc1, 0x61, 0xed,
+	0x10, 0xe3, 0xf4, 0xd6, 0x2e, 0xc9, 0x40, 0xc7, 0x3a, 0x5f, 0xa9, 0x41, 0x07, 0x4e, 0x51, 0x33,
+	0x8d, 0xb5, 0xf8, 0x23, 0xf0, 0xb9, 0xb0, 0xd7, 0x7f, 0xbb, 0xff, 0xdc, 0x4a, 0x59, 0x96, 0xaa,
+	0x77, 0x29, 0x98, 0xcf, 0x05, 0xed, 0x80, 0x7f, 0x29, 0xc8, 0x06, 0x04, 0x17, 0x68, 0x36, 0x72,
+	0x17, 0xb6, 0x06, 0x58, 0xfd, 0x80, 0x49, 0xdb, 0xa3, 0xef, 0x97, 0x6a, 0x56, 0x46, 0x73, 0xcd,
+	0x2f, 0xee, 0xb2, 0x83, 0x7c, 0x5d, 0xb7, 0x8f, 0xfd, 0x9b, 0xbf, 0x01, 0x00, 0x00, 0xff, 0xff,
+	0x47, 0xbd, 0x08, 0x65, 0xf9, 0x05, 0x00, 0x00,
 }
diff --git a/replication/pdu/pdu.proto b/replication/pdu/pdu.proto
index 0d1103c..2e6f045 100644
--- a/replication/pdu/pdu.proto
+++ b/replication/pdu/pdu.proto
@@ -63,7 +63,10 @@ message SendRes {
     // Whether the resume token provided in the request has been used or not.
     bool UsedResumeToken = 1;
 
-    repeated Property Properties  = 2;
+    // Expected stream size determined by dry run, not exact
+    int64 ExpectedSize = 2;
+
+    repeated Property Properties = 3;
 }
 
 message ReceiveReq {
diff --git a/zfs/zfs.go b/zfs/zfs.go
index 58ed6d3..5040567 100644
--- a/zfs/zfs.go
+++ b/zfs/zfs.go
@@ -15,6 +15,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/zrepl/zrepl/util"
 	"regexp"
+	"strconv"
 )
 
 type DatasetPath struct {
@@ -308,6 +309,49 @@ func ZFSSend(fs string, from, to string) (stream io.ReadCloser, err error) {
 	return
 }
 
+func ZFSSendDry(fs string, from, to string) (size int64, err error) {
+
+	fromV, err := absVersion(fs, from)
+	if err != nil {
+		return 0, err
+	}
+
+	toV := ""
+	if to != "" {
+		toV, err = absVersion(fs, to)
+		if err != nil {
+			return 0, err
+		}
+	}
+
+	args := make([]string, 0)
+	args = append(args, "send", "-n", "-v", "-P")
+
+	if toV == "" { // Initial
+		args = append(args, fromV)
+	} else {
+		args = append(args, "-i", fromV, toV)
+	}
+
+	cmd := exec.Command(ZFS_BINARY, args...)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return 0, err
+	}
+	o := string(output)
+	lines := strings.Split(o, "\n")
+	if len(lines) < 2 {
+		return 0, errors.New("zfs send -n did not return the expected number of lines")
+	}
+	fields := strings.Fields(lines[1])
+	if len(fields) != 2 {
+		return 0, errors.New("zfs send -n returned unexpexted output")
+	}
+
+	size, err = strconv.ParseInt(fields[1], 10, 64)
+	return size, err
+}
+
 func ZFSRecv(fs string, stream io.Reader, additionalArgs ...string) (err error) {
 
 	if err := validateZFSFilesystem(fs); err != nil {