diff --git a/server/opts.go b/server/opts.go
index 044ce294..2881545a 100644
--- a/server/opts.go
+++ b/server/opts.go
@@ -1680,6 +1680,40 @@ func parseJetStreamForAccount(v interface{}, acc *Account, errors *[]error, warn
 	return nil
 }
 
+// takes in a storage size as either an int or a string and returns an int64 value based on the input.
+func getStorageSize(v interface{}) (int64, error) {
+	_, ok := v.(int64)
+	if ok {
+		return v.(int64), nil
+	}
+
+	s, ok := v.(string)
+	if !ok {
+		return 0, fmt.Errorf("must be int64 or string")
+	}
+
+	if s == "" {
+		return 0, nil
+	}
+
+	suffix := s[len(s)-1:]
+	prefix := s[:len(s)-1]
+	num, err := strconv.ParseInt(prefix, 10, 64)
+	if err != nil {
+		return 0, err
+	}
+
+	suffixMap := map[string]int64{"K": 10, "M": 20, "G": 30, "T": 40}
+
+	mult, ok := suffixMap[suffix]
+	if !ok {
+		return 0, fmt.Errorf("sizes defined as strings must end in K, M, G, T")
+	}
+	num *= 1 << mult
+
+	return num, nil
+}
+
 // Parse enablement of jetstream for a server.
 func parseJetStream(v interface{}, opts *Options, errors *[]error, warnings *[]error) error {
 	var lt token
@@ -1711,10 +1745,18 @@ func parseJetStream(v interface{}, opts *Options, errors *[]error, warnings *[]e
 				}
 				opts.StoreDir = mv.(string)
 			case "max_memory_store", "max_mem_store", "max_mem":
-				opts.JetStreamMaxMemory = mv.(int64)
+				s, err := getStorageSize(mv)
+				if err != nil {
+					return &configErr{tk, fmt.Sprintf("max_mem_store %s", err)}
+				}
+				opts.JetStreamMaxMemory = s
 				opts.maxMemSet = true
 			case "max_file_store", "max_file":
-				opts.JetStreamMaxStore = mv.(int64)
+				s, err := getStorageSize(mv)
+				if err != nil {
+					return &configErr{tk, fmt.Sprintf("max_file_store %s", err)}
+				}
+				opts.JetStreamMaxStore = s
 				opts.maxStoreSet = true
 			case "domain":
 				opts.JetStreamDomain = mv.(string)
diff --git a/server/opts_test.go b/server/opts_test.go
index 1e73f167..8a579d1f 100644
--- a/server/opts_test.go
+++ b/server/opts_test.go
@@ -3256,3 +3256,32 @@ func TestMaxSubTokens(t *testing.T) {
 		t.Fatal("Did not get the permissions error")
 	}
 }
+
+func TestGetStorageSize(t *testing.T) {
+	tt := []struct {
+		input string
+		want  int64
+		err   bool
+	}{
+		{"1K", 1024, false},
+		{"1M", 1048576, false},
+		{"1G", 1073741824, false},
+		{"1T", 1099511627776, false},
+		{"1L", 0, true},
+		{"TT", 0, true},
+		{"", 0, false},
+	}
+
+	for _, v := range tt {
+		var testErr bool
+		got, err := getStorageSize(v.input)
+		if err != nil {
+			testErr = true
+		}
+
+		if got != v.want || v.err != testErr {
+			t.Errorf("Got: %v, want %v with error: %v", got, v.want, testErr)
+		}
+	}
+
+}
diff --git a/server/raft.go b/server/raft.go
index 65333221..fb7687f9 100644
--- a/server/raft.go
+++ b/server/raft.go
@@ -485,21 +485,10 @@ func (s *Server) startRaftNode(cfg *RaftConfig) (RaftNode, error) {
 
 // outOfResources checks to see if we are out of resources.
 func (n *raft) outOfResources() bool {
-	n.RLock()
 	js := n.js
 	if !n.track || js == nil {
-		n.RUnlock()
 		return false
 	}
-	n.RUnlock()
-
-	js.mu.RLock()
-	jsDisabled := js.disabled
-	js.mu.RUnlock()
-	if jsDisabled {
-		return false
-	}
-
 	return js.limitsExceeded(n.wtype)
 }
 
@@ -1537,6 +1526,8 @@ func (n *raft) runAsFollower() {
 			}
 		case <-n.respc:
 			// Ignore
+		case <-n.votes:
+			n.debug("Ignoring old vote response, we have stepped down")
 		case vreq := <-n.reqs:
 			n.processVoteRequest(vreq)
 		case newLeader := <-n.stepdown:
@@ -2827,10 +2818,6 @@ func (n *raft) processAppendEntryResponse(ar *appendEntryResponse) {
 
 // handleAppendEntryResponse processes responses to append entries.
 func (n *raft) handleAppendEntryResponse(sub *subscription, c *client, _ *Account, subject, reply string, msg []byte) {
-	// Ignore if not the leader.
-	if !n.Leader() {
-		return
-	}
 	msg = copyBytes(msg)
 	ar := n.decodeAppendEntryResponse(msg)
 	ar.reply = reply
@@ -3140,7 +3127,10 @@ func (n *raft) fileWriter() {
 			n.RLock()
 			copy(buf[0:], n.wtv)
 			n.RUnlock()
-			if err := ioutil.WriteFile(tvf, buf[:], 0640); err != nil {
+			<-dios
+			err := ioutil.WriteFile(tvf, buf[:], 0640)
+			dios <- struct{}{}
+			if err != nil {
 				n.setWriteErr(err)
 				n.warn("Error writing term and vote file for %q: %v", n.group, err)
 			}
@@ -3148,7 +3138,10 @@ func (n *raft) fileWriter() {
 			n.RLock()
 			buf := copyBytes(n.wps)
 			n.RUnlock()
-			if err := ioutil.WriteFile(psf, buf, 0640); err != nil {
+			<-dios
+			err := ioutil.WriteFile(psf, buf, 0640)
+			dios <- struct{}{}
+			if err != nil {
 				n.setWriteErr(err)
 				n.warn("Error writing peer state file for %q: %v", n.group, err)
 			}
@@ -3216,10 +3209,6 @@ func (n *raft) handleVoteResponse(sub *subscription, c *client, _ *Account, _, r
 		n.error("Received malformed vote response for %q", n.group)
 		return
 	}
-	if state := n.State(); state != Candidate && state != Leader {
-		n.debug("Ignoring old vote response, we have stepped down")
-		return
-	}
 
 	select {
 	case n.votes <- vr: