diff --git a/src/common/src/tmount.c b/src/common/src/tmount.c
index 420fdd76ded4ce580488599b88438392b82d1467..57a916247dd8e74c8102e9ccdd5d47692b156e12 100644
--- a/src/common/src/tmount.c
+++ b/src/common/src/tmount.c
@@ -193,7 +193,7 @@ static SDisk *tdGetDiskByName(char *dirName) {
   char     fdirName[TSDB_FILENAME_LEN] = "\0";
   SDiskID *pDiskID = NULL;
 
-  if (tdFormatDir(dirName, fdirName) < 0) {
+  if (tfsFormatDir(dirName, fdirName) < 0) {
     return NULL;
   }
 
@@ -228,7 +228,7 @@ static void tdDecDiskFiles(SDisk *pDisk, bool lock) {
   }
 }
 
-static int tdFormatDir(char *idir, char *odir) {
+static int tfsFormatDir(char *idir, char *odir) {
   wordexp_t wep;
 
   int code = wordexp(idir, &wep, 0);
@@ -295,7 +295,7 @@ static int tdAddDisk(SDiskCfg *pCfg) {
     return -1;
   }
 
-  if (tdFormatDir(pCfg->dir, dirName) < 0) {
+  if (tfsFormatDir(pCfg->dir, dirName) < 0) {
     uError("failed to add disk %s to tier %d level since %s", pCfg->dir, pCfg->level, tstrerror(terrno));
     return -1;
   }
diff --git a/src/dnode/CMakeLists.txt b/src/dnode/CMakeLists.txt
index 34b3e3d57725eec16301d38aa17617c6b64a8390..5608cfd6d16826e399f9ea41dc026d2ab2459610 100644
--- a/src/dnode/CMakeLists.txt
+++ b/src/dnode/CMakeLists.txt
@@ -48,7 +48,6 @@ IF (TD_LINUX)
       COMMAND ${CMAKE_COMMAND} -E echo dataDir ${TD_TESTS_OUTPUT_DIR}/data > ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
       COMMAND ${CMAKE_COMMAND} -E echo logDir ${TD_TESTS_OUTPUT_DIR}/log  >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
       COMMAND ${CMAKE_COMMAND} -E echo charset UTF-8  >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
-      COMMAND ${CMAKE_COMMAND} -E echo monitor 0  >> ${TD_TESTS_OUTPUT_DIR}/cfg/taos.cfg
       COMMENT "prepare taosd environment")
   ADD_CUSTOM_TARGET(${PREPARE_ENV_TARGET} ALL WORKING_DIRECTORY ${TD_EXECUTABLE_OUTPUT_PATH} DEPENDS ${PREPARE_ENV_CMD})
 ENDIF ()
diff --git a/src/dnode/src/dnodeMain.c b/src/dnode/src/dnodeMain.c
index 63e71cbb319aadb37f0cedcbd275e875646ac72c..b2c03cd02952ae30835c8cf6dbf8f86235ef99a4 100644
--- a/src/dnode/src/dnodeMain.c
+++ b/src/dnode/src/dnodeMain.c
@@ -37,8 +37,7 @@
 #include "dnodeMPeer.h"
 #include "dnodeShell.h"
 #include "dnodeTelemetry.h"
-#include "tpath.h"
-#include "tmount.h"
+#include "tfs.h"
 
 static SRunStatus tsRunStatus = TSDB_RUN_STATUS_STOPPED;
 
@@ -183,45 +182,35 @@ static void dnodeCheckDataDirOpenned(char *dir) {
 }
 
 static int32_t dnodeInitStorage() {
-  if (tdInitMount(tsDiskCfg, tsDiskCfgNum) < 0) {
-    dError("failed to add disks to dnode tier since %s", tstrerror(terrno));
+  if (tfsInit(tsDiskCfg, tsDiskCfgNum) < 0) {
+    dError("failed to init TFS since %s", tstrerror(terrno));
     return -1;
   }
-  tdGetPrimaryPath(tsDataDir);
-  tdGetVnodeRootDir(tsDataDir, tsVnodeDir);
+  tfsPrimaryPath(tsDataDir);
+  sprintf(tsMnodeDir, "%s/mnode", tsDataDir);
+  sprintf(tsVnodeDir, "%s/vnode", tsDataDir);
+  sprintf(tsDnodeDir, "%s/dnode", tsDataDir);
+  sprintf(tsVnodeBakDir, "%s/vnode_bak", tsDataDir);
 
   //TODO(dengyihao): no need to init here 
-  tdGetMnodeRootDir(tsDataDir, tsMnodeDir);
   if (dnodeCreateDir(tsMnodeDir) < 0) {
-   dError("failed to create mnode dir: %s, reason: %s", tsMnodeDir, strerror(errno));
+   dError("failed to create dir: %s, reason: %s", tsMnodeDir, strerror(errno));
    return -1;
   } 
 
-  tdGetDnodeRootDir(tsDataDir, tsDnodeDir);
   if (dnodeCreateDir(tsDnodeDir) < 0) {
-   dError("failed to create dnode dir: %s, reason: %s", tsDnodeDir, strerror(errno));
+   dError("failed to create dir: %s, reason: %s", tsDnodeDir, strerror(errno));
    return -1;
   }
 
-  for (int i = 0; i < tsDnodeTier->nTiers; i++) {
-    char dirName[TSDB_FILENAME_LEN];
-
-    STier *pTier = tsDnodeTier->tiers + i;
-    for (int j = 0; j < pTier->nDisks; j++) {
-      SDisk *pDisk = tdGetDisk(tsDnodeTier, i, j);
-
-      tdGetVnodeRootDir(pDisk->dir, dirName);
-      if (dnodeCreateDir(dirName) < 0) {
-        dError("failed to create vnode dir: %s, reason: %s", dirName, strerror(errno));
-        return -1;
-      }
+  if (tfsCreateDir("vnode") < 0) {
+    dError("failed to create vnode dir since %s", tstrerror(terrno));
+    return -1;
+  }
 
-      tdGetVnodeBackRootDir(pDisk->dir, dirName);
-      if (dnodeCreateDir(dirName) < 0) {
-        dError("failed to create vnode back dir: %s, reason: %s", dirName, strerror(errno));
-        return -1;
-      }
-    }
+  if (tfsCreateDir("vnode_bak") < 0) {
+    dError("failed to create vnode_bak dir since %s", tstrerror(terrno));
+    return -1;
   }
 
   dnodeCheckDataDirOpenned(tsDnodeDir);
@@ -230,7 +219,7 @@ static int32_t dnodeInitStorage() {
   return 0;
 }
 
-static void dnodeCleanupStorage() { tdDestroyMount(); }
+static void dnodeCleanupStorage() { tfsDestroy(); }
 
 bool  dnodeIsFirstDeploy() {
   return strcmp(tsFirst, tsLocalEp) == 0;
diff --git a/src/inc/dnode.h b/src/inc/dnode.h
index 0925ec9206e6c96c8aa6c2f8bac0ae009702b236..eef4490800a4191c2dee55c450cf99b8381bb64d 100644
--- a/src/inc/dnode.h
+++ b/src/inc/dnode.h
@@ -20,10 +20,6 @@
 extern "C" {
 #endif
 
-#include "taosdef.h"
-#include "tglobal.h"
-#include "hash.h"
-#include "taoserror.h"
 #include "trpc.h"
 #include "taosmsg.h"
 
diff --git a/src/inc/taoserror.h b/src/inc/taoserror.h
index 882f0c6b158ede9930a495dec870ffa63a5e6512..ff91989e5f15b00775fd02505704a3afccaab500 100644
--- a/src/inc/taoserror.h
+++ b/src/inc/taoserror.h
@@ -80,14 +80,6 @@ TAOS_DEFINE_ERROR(TSDB_CODE_REF_ID_REMOVED,               0, 0x0107, "Ref ID is
 TAOS_DEFINE_ERROR(TSDB_CODE_REF_INVALID_ID,               0, 0x0108, "Invalid Ref ID")
 TAOS_DEFINE_ERROR(TSDB_CODE_REF_ALREADY_EXIST,            0, 0x0109, "Ref is already there")
 TAOS_DEFINE_ERROR(TSDB_CODE_REF_NOT_EXIST,                0, 0x010A, "Ref is not there")
-TAOS_DEFINE_ERROR(TSDB_CODE_COM_INVALID_DISK_TIER,        0, 0x010B, "Invalid disk tier setting")
-TAOS_DEFINE_ERROR(TSDB_CODE_COM_TOO_MANY_DISKS,           0, 0x010C, "Too many disks in one tier")
-TAOS_DEFINE_ERROR(TSDB_CODE_COM_DISK_ALREADY_EXISTS,      0, 0x010D, "Disk already exists")
-TAOS_DEFINE_ERROR(TSDB_CODE_COM_DISK_NOT_DIRECTORY,       0, 0x010E, "Disk is not a directory")
-TAOS_DEFINE_ERROR(TSDB_CODE_COM_NO_DISK_SPACE,            0, 0x010F, "Dnode no disk space")
-TAOS_DEFINE_ERROR(TSDB_CODE_COM_DUPLICATE_PRIMARY_DISK,   0, 0x0110, "Duplicate primary disk")
-TAOS_DEFINE_ERROR(TSDB_CODE_COM_LACK_PRIMARY_DISK,        0, 0x0111, "Lack primary disk")
-TAOS_DEFINE_ERROR(TSDB_CODE_COM_NO_DISK_AT_TIER,          0, 0x0112, "No disk at tier")
 
 //client
 TAOS_DEFINE_ERROR(TSDB_CODE_TSC_INVALID_SQL,              0, 0x0200, "Invalid SQL statement")
diff --git a/src/tfs/inc/tfs.h b/src/inc/tfs.h
similarity index 90%
rename from src/tfs/inc/tfs.h
rename to src/inc/tfs.h
index bd4824bc348673aa1e6c1db2e259e2699d79f718..3c0ae1ed75d848673b72b24b0e181b6b318dc61c 100644
--- a/src/tfs/inc/tfs.h
+++ b/src/inc/tfs.h
@@ -24,6 +24,9 @@ extern "C" {
 
 int  tfsInit(SDiskCfg *pDiskCfg, int ndisk);
 void tfsDestroy();
+int  tfsUpdateInfo();
+void tfsPrimaryPath(char *dst);
+int  tfsCreateDir(char *name);
 
 #ifdef __cplusplus
 }
diff --git a/src/tfs/inc/tdisk.h b/src/tfs/inc/tdisk.h
index 3454bea49b9dca89d65bdfbbaf6906b96036aef1..532dc6a39fb980623b6fc496df2defc2b9d3895d 100644
--- a/src/tfs/inc/tdisk.h
+++ b/src/tfs/inc/tdisk.h
@@ -38,8 +38,9 @@ typedef struct {
   SDiskMeta dmeta;
 } SDisk;
 
-SDisk *tdNewDisk(SDiskID did, char *dir);
+SDisk *tdNewDisk(int level, int id, char *dir);
 void   tdFreeDisk(SDisk *pDisk);
+int    tdUpdateDiskInfo(SDisk *pDisk);
 
 #ifdef __cplusplus
 }
diff --git a/src/tfs/inc/ttier.h b/src/tfs/inc/ttier.h
index 1d113c847a913e747c223700c482cd2b624f91f5..f406e3d8c2bc2e4468bc9b305cb7c56855047f94 100644
--- a/src/tfs/inc/ttier.h
+++ b/src/tfs/inc/ttier.h
@@ -30,9 +30,12 @@ typedef struct {
   SDisk *disks[TSDB_MAX_DISK_PER_TIER];
 } STier;
 
+#define DISK_AT_TIER(pTier, id) ((pTier)->disks + (id))
+
 void   tdInitTier(STier *pTier, int level);
 void   tdDestroyTier(STier *pTier);
 SDisk *tdAddDiskToTier(STier *pTier, SDiskCfg *pCfg);
+int    tdUpdateTierInfo(STier *pTier);
 
 #ifdef __cplusplus
 }
diff --git a/src/tfs/src/tdisk.c b/src/tfs/src/tdisk.c
index bcefafc0b1e539abd916e23bdebc98f5ea69bc7e..83dfbb1b06ae9557a91feca184a69e4453790207 100644
--- a/src/tfs/src/tdisk.c
+++ b/src/tfs/src/tdisk.c
@@ -15,15 +15,15 @@
 
 #include "tdisk.h"
 
-SDisk *tdNewDisk(SDiskID did, char *dir) {
+SDisk *tdNewDisk(int level, int id, char *dir) {
   SDisk *pDisk = (SDisk *)calloc(1, sizeof(*pDisk));
   if (pDisk == NULL) {
     terrno = TSDB_CODE_FS_OUT_OF_MEMORY;
     return NULL;
   }
 
-  pDisk->level = did.level;
-  pDisk->id = did.id;
+  pDisk->level = level;
+  pDisk->id = id;
   strncpy(pDisk->dir, dir, TSDB_FILENAME_LEN);
 
   return pDisk;
@@ -33,4 +33,18 @@ void tdFreeDisk(SDisk *pDisk) {
   if (pDisk) {
     free(pDisk)
   }
+}
+
+int tdUpdateDiskInfo(SDisk *pDisk) {
+  SysDiskSize dstat;
+  if (taosGetDiskSize(pDisk->dir, &dstat) < 0) {
+    fError("failed to get dir %s information since %s", pDisk->dir, strerror(errno));
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    return -1;
+  }
+
+  pDisk->dmeta.size = dstat.tsize;
+  pDisk->dmeta.free = dstat.avail;
+
+  return 0;
 }
\ No newline at end of file
diff --git a/src/tfs/src/tfs.c b/src/tfs/src/tfs.c
index 4400da40e88eef09a320786d15617ab7b1ceeb38..09c6a7e70714d9fba81175c3a9970d5f48be3183 100644
--- a/src/tfs/src/tfs.c
+++ b/src/tfs/src/tfs.c
@@ -45,6 +45,7 @@ static SFS  tdFileSystem = {0};
 static SFS *pfs = &tdFileSystem;
 
 #define TIER_AT(level) (pfs->tiers + (level))
+#define DISK_AT(level, id) DISK_AT_TIER(TIER_AT(level), id)
 
 int tfsInit(SDiskCfg *pDiskCfg, int ndisk) {
   ASSERT(ndisk > 0);
@@ -68,13 +69,13 @@ int tfsInit(SDiskCfg *pDiskCfg, int ndisk) {
   }
 
   for (int idisk = 0; idisk < ndisk; idisk++) {
-    if (tdAddDiskToFS(pDiskCfg + idisk) < 0) {
+    if (tfsAddDisk(pDiskCfg + idisk) < 0) {
       tfsDestroy();
       return -1;
     }
   }
 
-  if (tdCheckFS() < 0) {
+  if (tfsCheck() < 0) {
     tfsDestroy();
     return -1;
   }
@@ -92,8 +93,46 @@ void tfsDestroy() {
   }
 }
 
-static int tdAddDiskToFS(SDiskCfg *pCfg) {
-  if (tdCheckAndFormatCfg(pCfg) < 0) return -1;
+int tfsUpdateInfo() {
+  tfsLock();
+
+  for (int level = 0; level < pfs->nlevel; level++) {
+    if (tdUpdateTierInfo(TIER_AT(level)) < 0) {
+      // TODO: deal with the error here
+    }
+  }
+
+  tfsUnLock();
+}
+
+void tfsPrimaryPath(char *dst) {
+  strncpy(dst, DISK_AT)
+}
+
+int tfsCreateDir(char *name) {
+  char dirName[TSDB_FILENAME_LEN] = "\0";
+
+  for (int level = 0; level < pfs->nlevel; level++) {
+    STier *pTier = TIER_AT(level);
+    for (int id = 0; id < pTier->ndisk; id++) {
+      SDisk *pDisk = DISK_AT_TIER(pTier, id);
+
+      ASSERT(pDisk != NULL);
+
+      snprintf(dirName, TSDB_FILENAME_LEN, "%s/%s", pDisk->dir, name);
+
+      if (mkdir(dirName, 0755) != 0 && errno != EEXIST) {
+        terrno = TAOS_SYSTEM_ERROR(errno);
+        return -1;
+      }
+    }
+  }
+
+  return 0;
+}
+
+static int tfsAddDisk(SDiskCfg *pCfg) {
+  if (tfsCheckAndFormatCfg(pCfg) < 0) return -1;
 
   if (tdAddDiskToTier(pCfg, TIER_AT(pCfg->level)) < 0) {
     fError("failed to add disk %s to FS since %s", pCfg->dir, tstrerror(terrno));
@@ -105,7 +144,7 @@ static int tdAddDiskToFS(SDiskCfg *pCfg) {
   return 0;
 }
 
-static int tdCheckAndFormatCfg(SDiskCfg *pCfg) {
+static int tfsCheckAndFormatCfg(SDiskCfg *pCfg) {
   char        dirName[TSDB_FILENAME_LEN] = "\0";
   struct stat pstat;
 
@@ -122,7 +161,7 @@ static int tdCheckAndFormatCfg(SDiskCfg *pCfg) {
   }
 
 
-  if (tdFormatDir(pCfg->dir, dirName) < 0) {
+  if (tfsFormatDir(pCfg->dir, dirName) < 0) {
     fError("failed to add disk %s to FS since invalid dir format", pCfg->dir);
     terrno = TSDB_CODE_FS_INVLD_CFG;
     return -1;
@@ -157,7 +196,7 @@ static int tdCheckAndFormatCfg(SDiskCfg *pCfg) {
   return 0;
 }
 
-static int tdFormatDir(char *idir, char *odir) {
+static int tfsFormatDir(char *idir, char *odir) {
   wordexp_t wep = {0};
 
   int code = wordexp(idir, &wep, 0);
@@ -177,7 +216,7 @@ static int tdFormatDir(char *idir, char *odir) {
 
 }
 
-static int tdCheckFS() {
+static int tfsCheck() {
   if (DISK_AT(0, 0) == NULL) {
     fError("no primary disk is set");
     terrno = TSDB_CODE_FS_NO_PRIMARY_DISK;
@@ -192,5 +231,25 @@ static int tdCheckFS() {
     }
   }
 
+  return 0;
+}
+
+static int tfsLock() {
+  int code = pthread_mutex_lock(&(pfs->lock));
+  if (code != 0) {
+    terrno = TAOS_SYSTEM_ERROR(code);
+    return -1;
+  }
+
+  return 0;
+}
+
+static tfsUnLock() {
+  int code = pthread_mutex_unlock(&(pfs->lock));
+  if (code != 0) {
+    terrno = TAOS_SYSTEM_ERROR(code);
+    return -1;
+  }
+
   return 0;
 }
\ No newline at end of file
diff --git a/src/tfs/src/ttier.c b/src/tfs/src/ttier.c
index 8faa03e2eee2030e607c4e56b55c450686234e29..11fb0676820d0a10d8c45a21695a1e245bad74f4 100644
--- a/src/tfs/src/ttier.c
+++ b/src/tfs/src/ttier.c
@@ -16,8 +16,6 @@
 #include "ttier.h"
 #include "tglobal.h"
 
-#define DISK_AT_TIER(pTier, id) ((pTier)->disks + (id))
-
 void tdInitTier(STier *pTier, int level) {
   pTier->level = level;
 }
@@ -59,8 +57,16 @@ SDisk *tdAddDiskToTier(STier *pTier, SDiskCfg *pCfg) {
     }
   }
 
-  pTier->disks[id] = tdNewDisk({pCfg->level, id}, pCfg->dir);
+  pTier->disks[id] = tdNewDisk(pCfg->level, id, pCfg->dir);
   if (pTier->disks[id] == NULL) return -1;
 
   return 0;
+}
+
+int tdUpdateTierInfo(STier *pTier) {
+  for (int id = 0; id < pTier->ndisk; id++) {
+    if (tdUpdateDiskInfo(DISK_AT_TIER(pTier, id)) < 0) {
+      // TODO: deal with the error here
+    }
+  }
 }
\ No newline at end of file