diff --git a/dashboard/src/views/LogListView.vue b/dashboard/src/views/LogListView.vue
index 8e4c411..1667d99 100644
--- a/dashboard/src/views/LogListView.vue
+++ b/dashboard/src/views/LogListView.vue
@@ -40,9 +40,9 @@ async function refreshFileList(): Promise<void> {
 			appLogs.push(f)
 			continue
 		}
-		const data = /^access\.(\d+)\.log(?:\.gz)?$/.exec(f.name)
+		const data = /^access(?:\.(\d+))?\.log(?:\.gz)?$/.exec(f.name)
 		if (data) {
-			accessLogs.push({ n: Number.parseInt(data[1]), f: f })
+			accessLogs.push({ n: data[1] ? Number.parseInt(data[1]) : 0, f: f })
 			continue
 		}
 		otherLogs.push(f)
diff --git a/lang/en/us.go b/lang/en/us.go
index 33309a6..b836f76 100644
--- a/lang/en/us.go
+++ b/lang/en/us.go
@@ -65,6 +65,7 @@ var areaUS = map[string]string{
 	"info.sync.none":                   "All files were synchronized",
 	"warn.sync.interrupted":            "File sync interrupted",
 	"info.sync.config":                 "Sync config: %#v",
+	"error.sync.part.working":          "Only %d out of %d storages are working! Sync will begin in a minute",
 	"hint.sync.total":                  "Total: ",
 	"hint.sync.downloading":            "> Downloading ",
 	"hint.sync.downloading.handler":    "Downloading %s from handler",
diff --git a/lang/zh/cn.go b/lang/zh/cn.go
index a016356..ed16e39 100644
--- a/lang/zh/cn.go
+++ b/lang/zh/cn.go
@@ -65,6 +65,7 @@ var areaCN = map[string]string{
 	"info.sync.none":                   "所有文件已同步",
 	"warn.sync.interrupted":            "同步已中断",
 	"info.sync.config":                 "同步配置: %#v",
+	"error.sync.part.working":          "仅有 %d / %d 个存储工作正常! 同步将在1分钟内开始",
 	"hint.sync.total":                  "总计: ",
 	"hint.sync.downloading":            "> 下载中 ",
 	"hint.sync.downloading.handler":    "Downloading %s from handler",
diff --git a/storage/storage_webdav.go b/storage/storage_webdav.go
index 35db4d8..2cff835 100644
--- a/storage/storage_webdav.go
+++ b/storage/storage_webdav.go
@@ -129,7 +129,7 @@ type WebDavStorage struct {
 	httpCli       *http.Client
 	noRedCli      *http.Client // no redirect client
 
-	measures  utils.SyncMap[int, struct{}]
+	measures  *utils.SyncMap[int, struct{}]
 	working   atomic.Int32
 	checkMux  sync.RWMutex
 	lastCheck time.Time
@@ -196,6 +196,7 @@ func (s *WebDavStorage) Init(ctx context.Context) (err error) {
 		return
 	}
 
+	s.measures = utils.NewSyncMap[int, struct{}]()
 	if err := s.cli.Mkdir("measure", 0755); err != nil {
 		if !webdavIsHTTPError(err, http.StatusConflict) {
 			log.Warnf("Cannot create measure folder for %s: %v", s.String(), err)
diff --git a/sync.go b/sync.go
index 37104bc..ea4ed60 100644
--- a/sync.go
+++ b/sync.go
@@ -529,6 +529,9 @@ func (cr *Cluster) syncFiles(ctx context.Context, files []FileInfo, heavyCheck b
 		err := s.CheckUpload(tctx)
 		cancel()
 		if err != nil {
+			if err := ctx.Err(); err != nil {
+				return err
+			}
 			aliveStorages--
 			log.Errorf("Storage %s does not work: %v", s.String(), err)
 		}
@@ -538,6 +541,14 @@ func (cr *Cluster) syncFiles(ctx context.Context, files []FileInfo, heavyCheck b
 		log.Errorf(Tr("error.sync.failed"), err)
 		return err
 	}
+	if aliveStorages < len(cr.storages) {
+		log.Errorf(Tr("error.sync.part.working"), aliveStorages < len(cr.storages))
+		select {
+		case <-time.After(time.Minute):
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+	}
 
 	for _, f := range missing {
 		log.Debugf("File %s is for %v", f.Hash, f.targets)