xlog store in single lun in shared storage

script/gspylib/component/DSS/dss_checker.py

@@ -70,10 +70,14 @@ class DssConfig():
         inst.dss_config = str(
             DssConfig((dss_ids, dss_ips, dss_ports), offset=10))
         infos = list(filter(None, re.split(r':|,', inst.dss_vg_info)))
-        if len(infos[::2]) != len(dss_ips) + 1:
+
+        # We support two deployment method：
+        # 1. one dss disk for xlog of each node, and one dss disk for shared data;
+        # 2. one dss disk for xlogs of all nodes, and one dss disk for shared data;
+        if (len(infos[::2]) != len(dss_ips) + 1) and (len(infos[::2]) != 2):
             raise Exception(
                 ErrorCode.GAUSS_500['GAUSS_50026'] % 'dss_vg_info' +
-                ' The number of volumes is one more than the number of dns.' +
+                ' The number of volumes is one more than the number of dns or the number of volumes is 2.' +
                 ' The number of dns is {} and the number of dss volumes is {}'.
                 format(len(dss_ips), len(infos[::2])))
         for dp in dss_ports:

script/gspylib/component/DSS/dss_comp.py

@@ -64,13 +64,39 @@ class DssInst():
         else:
             raise Exception(ErrorCode.GAUSS_502["GAUSS_50201"] % self.cfg_path)
         return items
+    
+    @staticmethod
+    def get_private_vg_num(dss_home):
+        '''
+        Obtaining Private Volumes
+        '''
+
+
+        vg_cfg = os.path.join(dss_home, 'cfg', 'dss_vg_conf.ini')
+        if os.path.isfile(vg_cfg):
+            try:
+                with open(vg_cfg, "r") as fp:
+                    context = fp.read().strip()
+                    pris = re.findall(
+                        '(.*):/dev/.*private_.*', context)
+                    if pris:
+                        return len(pris)
+                    else:
+                        raise Exception(ErrorCode.GAUSS_504["GAUSS_50416"] %
+                                        'in dss_vg_conf.ini')
+            except Exception as eds:
+                raise Exception(ErrorCode.GAUSS_504["GAUSS_50414"] % eds)
+        else:
+            raise Exception(ErrorCode.GAUSS_502["GAUSS_50201"] % vg_cfg)
 
     @staticmethod
-    def get_private_vgname_by_ini(dss_home, dss_id):
+    def get_private_vgname_by_ini(dss_home, dss_id, xlog_in_one_priv_vg):
         '''
         Obtaining a Private Volume
         '''
 
+        if xlog_in_one_priv_vg:
+            dss_id = 0
         vg_cfg = os.path.join(dss_home, 'cfg', 'dss_vg_conf.ini')
         if os.path.isfile(vg_cfg):
             try:

script/gspylib/component/Kernel/DN_OLAP/DN_OLAP.py

@@ -150,7 +150,14 @@ class DN_OLAP(Kernel):
                 dss_nodes_list = DssConfig.get_value_b64_handler(
                     'dss_nodes_list', self.dss_config, action='decode')
                 cfg_context = DssInst.get_dms_url(dss_nodes_list)
-                pri_vgname = DssInst.get_private_vgname_by_ini(dss_home, inst_id)
+
+                xlog_in_one_priv_vg = False
+                infos = list(filter(None, re.split(r':|:|,', dss_nodes_list)))
+                pri_vg_num = DssInst.get_private_vg_num(dss_home)
+                # when use one private vg for xlog, vgname should get from inst_id=0
+                if (pri_vg_num < len(infos[::3]) and pri_vg_num == 1):
+                    xlog_in_one_priv_vg = True
+                pri_vgname = DssInst.get_private_vgname_by_ini(dss_home, inst_id, xlog_in_one_priv_vg)
                 cmd += " -n --vgname=\"{}\" --enable-dss --dms_url=\"{}\" -I {}" \
                     " --socketpath=\"{}\"".format(
                     "+{},+{}".format(vgname, pri_vgname), cfg_context, inst_id,