diff --git a/src/nameserver/block_mapping.cc b/src/nameserver/block_mapping.cc
index 395a2405..325d9a8f 100644
--- a/src/nameserver/block_mapping.cc
+++ b/src/nameserver/block_mapping.cc
@@ -816,12 +816,17 @@ void BlockMapping::TryRecover(NSBlock* block) {
     }
     int64_t block_id = block->id;
     if (block->replica.size() < block->expect_replica_num) {
-        if (block->replica.size() == 0 && block->recover_stat != kLost) {
-            LOG(INFO, "[TryRecover] lost block #%ld ", block_id);
-            lost_blocks_.insert(block_id);
-            SetState(block, kLost);
-            lo_pri_recover_.erase(block_id);
-            hi_pri_recover_.erase(block_id);
+        if (block->replica.size() == 0) {
+            if (block->block_size && block->recover_stat != kLost) {
+                LOG(INFO, "[TryRecover] lost block #%ld ", block_id);
+                lost_blocks_.insert(block_id);
+                SetState(block, kLost);
+                lo_pri_recover_.erase(block_id);
+                hi_pri_recover_.erase(block_id);
+            } else if (block->block_size == 0 && block->recover_stat == kLost) {
+                lost_blocks_.erase(block_id);
+                LOG(WARNING, "[TryRecover] empty block #%ld remove from lost", block_id);
+            }
         } else if (block->replica.size() == 1 && block->recover_stat != kHiRecover) {
             hi_pri_recover_.insert(block_id);
             LOG(INFO, "[TryRecover] need more recover: #%ld %s->kHiRecover",
diff --git a/src/nameserver/chunkserver_manager.cc b/src/nameserver/chunkserver_manager.cc
index 6c058be3..279a22aa 100644
--- a/src/nameserver/chunkserver_manager.cc
+++ b/src/nameserver/chunkserver_manager.cc
@@ -214,6 +214,9 @@ void ChunkServerManager::HandleHeartBeat(const HeartBeatRequest* request, HeartB
     } else if (info->status() == kCsOffLine) {
         LOG(INFO, "Dead chunkserver revival C%d %s", cs_id, address.c_str());
         assert(heartbeat_list_.find(info->last_heartbeat()) == heartbeat_list_.end());
+        char buf[20];
+        common::timer::now_time_str(buf, 20, common::timer::kMin);
+        info->set_start_time(std::string(buf));
         info->set_is_dead(false);
         info->set_status(kCsActive);
         chunkserver_num_++;
@@ -458,6 +461,9 @@ bool ChunkServerManager::UpdateChunkServer(int cs_id, const std::string& tag, in
     if (!GetChunkServerPtr(cs_id, &info)) {
         return false;
     }
+    char buf[20];
+    common::timer::now_time_str(buf, 20, common::timer::kMin);
+    info->set_start_time(std::string(buf));
     info->set_disk_quota(quota);
     info->set_tag(tag);
     if (info->status() != kCsReadonly) {
@@ -481,6 +487,9 @@ int32_t ChunkServerManager::AddChunkServer(const std::string& address,
     mu_.AssertHeld();
     ChunkServerInfo* info = new ChunkServerInfo;
     int32_t id = next_chunkserver_id_++;
+    char buf[20];
+    common::timer::now_time_str(buf, 20, common::timer::kMin);
+    info->set_start_time(std::string(buf));
     info->set_id(id);
     info->set_address(address);
     info->set_tag(tag);
diff --git a/src/nameserver/nameserver_impl.cc b/src/nameserver/nameserver_impl.cc
index b2586816..8d5730fa 100644
--- a/src/nameserver/nameserver_impl.cc
+++ b/src/nameserver/nameserver_impl.cc
@@ -1131,9 +1131,9 @@ bool NameServerImpl::WebService(const sofa::pbrpc::HTTPRequest& request,
 
     table_str +=
         "<table class=\"table\">"
-        "<tr><td>id</td><td>address</td><td>blocks</td><td>Data size</td>"
-        "<td>Disk quota</td><td>Disk used</td><td>Writing buffers</td>"
-        "<td>tag</td><td>status</td><td>last_check</td><tr>";
+        "<tr><td>ID</td><td>Address</td><td>Blocks</td><td>Size</td>"
+        "<td>Quota</td><td>Used</td><td>Buffers</td>"
+        "<td>Tag</td><td>Status</td><td>Check</td><td>Start</td><tr>";
     int dead_num = 0;
     int64_t total_quota = 0;
     int64_t total_data = 0;
@@ -1216,6 +1216,8 @@ bool NameServerImpl::WebService(const sofa::pbrpc::HTTPRequest& request,
         table_str += "</td><td>";
         table_str += common::NumToString(
                         common::timer::now_time() - chunkserver.last_heartbeat());
+        table_str += "</td><td>";
+        table_str += chunkserver.start_time();
         table_str += "</td></tr>";
     }
     table_str += "</table>";
diff --git a/src/proto/nameserver.proto b/src/proto/nameserver.proto
index 51e487da..31c0231a 100644
--- a/src/proto/nameserver.proto
+++ b/src/proto/nameserver.proto
@@ -8,6 +8,7 @@ option cc_generic_services = true;
 message ChunkServerInfo {
     optional int32 id = 1;
     optional string address = 2;
+    optional string start_time = 17;
     optional int32 last_heartbeat = 3;
     optional int64 data_size = 4;
     optional int64 disk_quota = 5;