diff --git a/internal/caches/storage_file.go b/internal/caches/storage_file.go
index 9312370..6f73626 100644
--- a/internal/caches/storage_file.go
+++ b/internal/caches/storage_file.go
@@ -27,6 +27,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"runtime"
 	"sort"
 	"strconv"
 	"strings"
@@ -62,7 +63,16 @@ const (
 var sharedWritingFileKeyMap = map[string]zero.Zero{} // key => bool
 var sharedWritingFileKeyLocker = sync.Mutex{}
 
-var maxOpenFiles = 2
+var maxOpenFiles = 3
+
+func init() {
+	if teaconst.DiskIsFast {
+		maxOpenFiles = runtime.NumCPU()
+	}
+	if maxOpenFiles < 3 {
+		maxOpenFiles = 3
+	}
+}
 
 // FileStorage 文件缓存
 //   文件结构：
@@ -425,7 +435,7 @@ func (this *FileStorage) openWriter(key string, expiredAt int64, status int, siz
 		return nil, ErrFileIsWriting
 	}
 
-	if len(sharedWritingFileKeyMap) > maxOpenFiles {
+	if !isFlushing && len(sharedWritingFileKeyMap) >= maxOpenFiles {
 		sharedWritingFileKeyLocker.Unlock()
 		return nil, ErrTooManyOpenFiles
 	}
diff --git a/internal/const/vars.go b/internal/const/vars.go
index 8f7a3d0..fdfc8e7 100644
--- a/internal/const/vars.go
+++ b/internal/const/vars.go
@@ -17,4 +17,6 @@ var (
 
 	IsQuiting    = false // 是否正在退出
 	EnableDBStat = false // 是否开启本地数据库统计
+
+	DiskIsFast = false // 是否为高速硬盘
 )
diff --git a/internal/nodes/node.go b/internal/nodes/node.go
index 1a815d9..4750f88 100644
--- a/internal/nodes/node.go
+++ b/internal/nodes/node.go
@@ -111,6 +111,9 @@ func (this *Node) Start() {
 		return
 	}
 
+	// 检查硬盘类型
+	this.checkDisk()
+
 	// 读取API配置
 	err = this.syncConfig(0)
 	if err != nil {
@@ -911,3 +914,21 @@ func (this *Node) onReload(config *nodeconfigs.NodeConfig) {
 		teaconst.GlobalProductName = config.ProductConfig.Name
 	}
 }
+
+func (this *Node) checkDisk() {
+	if runtime.GOOS == "linux" {
+		for _, path := range []string{
+			"/sys/block/vda/queue/rotational",
+			"/sys/block/sda/queue/rotational",
+		} {
+			data, err := ioutil.ReadFile(path)
+			if err != nil {
+				continue
+			}
+			if string(data) == "0" {
+				teaconst.DiskIsFast = true
+			}
+			break
+		}
+	}
+}