diff --git a/src/common/inc/tdisk.h b/src/common/inc/tdisk.h
index cf68ccd6e1041a13507903ba917edbebb3a686e6..7ce924c63e4ab6146aef076e82bb9ec04fce1d07 100644
--- a/src/common/inc/tdisk.h
+++ b/src/common/inc/tdisk.h
@@ -26,8 +26,8 @@
 extern "C" {
 #endif
 
-int  tdInitTiers(SDiskCfg *pDiskCfg, int ndisk);
-void tdDestroyTiers();
+int  tdInitMount(SDiskCfg *pDiskCfg, int ndisk);
+void tdDestroyMount();
 int  tdUpdateDiskInfos();
 void tdGetPrimaryPath(char *dst);
 
diff --git a/src/common/src/tdisk.c b/src/common/src/tdisk.c
index 2478b4ddd992ef53d845e0263c69dce212b254ce..51d47e6601c13eab7835819f5e3ce172db29ffce 100644
--- a/src/common/src/tdisk.c
+++ b/src/common/src/tdisk.c
@@ -62,7 +62,7 @@ typedef struct STiers {
 static struct STiers  tdTiers;
 static struct STiers *pTiers = &tdTiers;
 
-int tdInitTiers(SDiskCfg *pDiskCfg, int ndisk) {
+int tdInitMount(SDiskCfg *pDiskCfg, int ndisk) {
   ASSERT(ndisk > 0);
 
   memset((void *)pTiers, 0, sizeof(*pTiers));
@@ -77,26 +77,26 @@ int tdInitTiers(SDiskCfg *pDiskCfg, int ndisk) {
                              taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), false, HASH_NO_LOCK);
   if (pTiers->map == NULL) {
     terrno = TSDB_CODE_COM_OUT_OF_MEMORY;
-    tdDestroyTiers();
+    tdDestroyMount();
     return -1;
   }
 
   for (int idisk = 0; idisk < ndisk; idisk++) {
     if (tdAddDisk(pDiskCfg + idisk) < 0) {
-      tdDestroyTiers();
+      tdDestroyMount();
       return -1;
     }
   }
 
   if (tdCheckTiers() < 0) {
-    tdDestroyTiers();
+    tdDestroyMount();
     return -1;
   }
 
   return 0;
 }
 
-void tdDestroyTiers() {
+void tdDestroyMount() {
   taosHashCleanup(pTiers->map);
   pTiers->map = NULL;
 
@@ -144,13 +144,13 @@ static SDisk *tdGetPrimaryDisk() { return DISK_AT(0, 0); }
 static int tdCheckTiers() {
   ASSERT(pTiers->nLevel > 0);
   if (tdGetPrimaryDisk(pTiers) == NULL) {
-    terrno = TSDB_CODE_DND_LACK_PRIMARY_DISK;
+    terrno = TSDB_CODE_COM_LACK_PRIMARY_DISK;
     return -1;
   }
 
   for (int i = 0; i < pTiers->nLevel; i++) {
     if (pTiers->tiers[i].nDisks == 0) {
-      terrno = TSDB_CODE_DND_NO_DISK_AT_TIER;
+      terrno = TSDB_CODE_COM_NO_DISK_AT_TIER;
       return -1;
     }
   }
@@ -179,7 +179,7 @@ static SDisk *tdAssignDisk(int level) {
   }
 
   if (pDisk == NULL) {
-    terrno = TSDB_CODE_DND_NO_DISK_SPACE;
+    terrno = TSDB_CODE_COM_NO_DISK_SPACE;
     tdUnLockTiers(pTiers);
     return NULL;
   }
@@ -266,7 +266,7 @@ static int tdCheckDisk(char *dirName) {
   if (S_ISDIR(pstat.st_mode)) {
     return 0;
   } else {
-    terrno = TSDB_CODE_DND_DISK_NOT_DIRECTORY;
+    terrno = TSDB_CODE_COM_DISK_NOT_DIRECTORY;
     return -1;
   }
 }
@@ -292,7 +292,7 @@ static int tdAddDisk(SDiskCfg *pCfg) {
   SDisk * pDisk = NULL;
 
   if (pCfg->level < 0 || pCfg->level >= TSDB_MAX_TIERS) {
-    terrno = TSDB_CODE_DND_INVALID_DISK_TIER;
+    terrno = TSDB_CODE_COM_INVALID_DISK_TIER;
     uError("failed to add disk %s to tier %d level since %s", pCfg->dir, pCfg->level, tstrerror(terrno));
     return -1;
   }
@@ -306,13 +306,13 @@ static int tdAddDisk(SDiskCfg *pCfg) {
   diskid.level = pCfg->level;
 
   if (pTier->nDisks >= TSDB_MAX_DISKS_PER_TIER) {
-    terrno = TSDB_CODE_DND_TOO_MANY_DISKS;
+    terrno = TSDB_CODE_COM_TOO_MANY_DISKS;
     uError("failed to add disk %s to tier %d level since %s", pCfg->dir, pCfg->level, tstrerror(terrno));
     return -1;
   }
 
   if (tdGetDiskByName(dirName) != NULL) {
-    terrno = TSDB_CODE_DND_DISK_ALREADY_EXISTS;
+    terrno = TSDB_CODE_COM_DISK_ALREADY_EXISTS;
     uError("failed to add disk %s to tier %d level since %s", pCfg->dir, pCfg->level, tstrerror(terrno));
     return -1;
   }
@@ -324,13 +324,13 @@ static int tdAddDisk(SDiskCfg *pCfg) {
 
   if (pCfg->primary) {
     if (pCfg->level != 0) {
-      terrno = TSDB_CODE_DND_INVALID_DISK_TIER;
+      terrno = TSDB_CODE_COM_INVALID_DISK_TIER;
       uError("failed to add disk %s to tier %d level since %s", pCfg->dir, pCfg->level, tstrerror(terrno));
       return -1;
     }
 
     if (tdGetPrimaryDisk() != NULL) {
-      terrno = TSDB_CODE_DND_DUPLICATE_PRIMARY_DISK;
+      terrno = TSDB_CODE_COM_DUPLICATE_PRIMARY_DISK;
       uError("failed to add disk %s to tier %d level since %s", pCfg->dir, pCfg->level, tstrerror(terrno));
       return -1;
     }
@@ -343,7 +343,7 @@ static int tdAddDisk(SDiskCfg *pCfg) {
       } else {
         diskid.did = pTier->nDisks + 1;
         if (diskid.did >= TSDB_MAX_DISKS_PER_TIER) {
-          terrno = TSDB_CODE_DND_TOO_MANY_DISKS;
+          terrno = TSDB_CODE_COM_TOO_MANY_DISKS;
           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/src/dnodeMain.c b/src/dnode/src/dnodeMain.c
index 5e4136bd8c3fc8f8294aee72eff1a3fbf73d471b..d96b0fe25cc319c9eba134b080ab5b6885091e93 100644
--- a/src/dnode/src/dnodeMain.c
+++ b/src/dnode/src/dnodeMain.c
@@ -183,7 +183,7 @@ static void dnodeCheckDataDirOpenned(char *dir) {
 }
 
 static int32_t dnodeInitStorage() {
-  if (tdInitTiers(tsDiskCfg, tsDiskCfgNum) < 0) {
+  if (tdInitMount(tsDiskCfg, tsDiskCfgNum) < 0) {
     dError("failed to add disks to dnode tier since %s", tstrerror(terrno));
     return -1;
   }
@@ -230,7 +230,7 @@ static int32_t dnodeInitStorage() {
   return 0;
 }
 
-static void dnodeCleanupStorage() { tdDestroyTiers(); }
+static void dnodeCleanupStorage() { tdDestroyMount(); }
 
 bool  dnodeIsFirstDeploy() {
   return strcmp(tsFirst, tsLocalEp) == 0;
diff --git a/src/inc/taoserror.h b/src/inc/taoserror.h
index 01bf0808051204a8e03d1c6d0529cbd975ebb530..3f88ec486ac89868cee33ede7ebfe7e8654a0b86 100644
--- a/src/inc/taoserror.h
+++ b/src/inc/taoserror.h
@@ -80,6 +80,14 @@ 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")
@@ -188,14 +196,6 @@ TAOS_DEFINE_ERROR(TSDB_CODE_DND_MSG_NOT_PROCESSED,        0, 0x0400, "Message no
 TAOS_DEFINE_ERROR(TSDB_CODE_DND_OUT_OF_MEMORY,            0, 0x0401, "Dnode out of memory")
 TAOS_DEFINE_ERROR(TSDB_CODE_DND_NO_WRITE_ACCESS,          0, 0x0402, "No permission for disk files in dnode")
 TAOS_DEFINE_ERROR(TSDB_CODE_DND_INVALID_MSG_LEN,          0, 0x0403, "Invalid message length")
-TAOS_DEFINE_ERROR(TSDB_CODE_DND_INVALID_DISK_TIER,        0, 0x0404, "Invalid disk tier setting")
-TAOS_DEFINE_ERROR(TSDB_CODE_DND_TOO_MANY_DISKS,           0, 0x0405, "Too many disks in one tier")
-TAOS_DEFINE_ERROR(TSDB_CODE_DND_DISK_ALREADY_EXISTS,      0, 0x0406, "Disk already exists")
-TAOS_DEFINE_ERROR(TSDB_CODE_DND_DISK_NOT_DIRECTORY,       0, 0x0407, "Disk is not a directory")
-TAOS_DEFINE_ERROR(TSDB_CODE_DND_NO_DISK_SPACE,            0, 0x0408, "Dnode no disk space")
-TAOS_DEFINE_ERROR(TSDB_CODE_DND_DUPLICATE_PRIMARY_DISK,   0, 0x0409, "Duplicate primary disk")
-TAOS_DEFINE_ERROR(TSDB_CODE_DND_LACK_PRIMARY_DISK,        0, 0x040A, "Lack primary disk")
-TAOS_DEFINE_ERROR(TSDB_CODE_DND_NO_DISK_AT_TIER,          0, 0x040B, "No disk at tier")
 
 // vnode 
 TAOS_DEFINE_ERROR(TSDB_CODE_VND_ACTION_IN_PROGRESS,       0, 0x0500, "Action in progress")