diff --git a/pkg/port/iscsit/conn.go b/pkg/port/iscsit/conn.go
index 59efd6b..d74fd5e 100644
--- a/pkg/port/iscsit/conn.go
+++ b/pkg/port/iscsit/conn.go
@@ -24,7 +24,6 @@ import (
 
 	"github.com/gostor/gotgt/pkg/api"
 	"github.com/gostor/gotgt/pkg/util"
-	"github.com/gostor/gotgt/pkg/util/pool"
 )
 
 const (
@@ -126,13 +125,12 @@ func (c *iscsiConnection) init() {
 	sort.Sort(c.loginParam.sessionParam)
 }
 
-func (c *iscsiConnection) readData(size int) ([]byte, int, error) {
-	var buf = pool.NewBuffer(size)
+func (c *iscsiConnection) readData(buf []byte) (int, error) {
 	length, err := io.ReadFull(c.conn, buf)
 	if err != nil {
-		return nil, -1, err
+		return -1, err
 	}
-	return buf, length, nil
+	return length, nil
 }
 
 func (c *iscsiConnection) write(resp []byte) (int, error) {
diff --git a/pkg/port/iscsit/iscsid.go b/pkg/port/iscsit/iscsid.go
index 02fb338..e551b3d 100644
--- a/pkg/port/iscsit/iscsid.go
+++ b/pkg/port/iscsit/iscsid.go
@@ -217,7 +217,7 @@ func (s *ISCSITargetDriver) rxHandler(conn *iscsiConnection) {
 		switch conn.rxIOState {
 		case IOSTATE_RX_BHS:
 			log.Debug("rx handler: IOSTATE_RX_BHS")
-			buf, length, err = conn.readData(BHS_SIZE)
+			length, err = conn.readData(buf)
 			if err != nil {
 				log.Error(err)
 				return
@@ -227,7 +227,6 @@ func (s *ISCSITargetDriver) rxHandler(conn *iscsiConnection) {
 				conn.state = CONN_STATE_CLOSE
 				return
 			}
-			//conn.rxBuffer = buf
 			cmd, err = parseHeader(buf)
 			if err != nil {
 				log.Error(err)
@@ -262,12 +261,11 @@ func (s *ISCSITargetDriver) rxHandler(conn *iscsiConnection) {
 			cmd.RawData = pool.NewBuffer(dl)
 			length := 0
 			for length < dl {
-				b, l, err := conn.readData(dl - length)
+				l, err := conn.readData(cmd.RawData[length:])
 				if err != nil {
 					log.Error(err)
 					return
 				}
-				copy(cmd.RawData[length:], b)
 				length += l
 			}
 			if length != dl {