NSAmelchev commented on code in PR #12060:
URL: https://github.com/apache/ignite/pull/12060#discussion_r2095153343


##########
modules/core/src/main/java/org/apache/ignite/internal/IgnitionEx.java:
##########
@@ -1943,11 +1943,20 @@ private IgniteConfiguration 
initializeConfiguration(IgniteConfiguration cfg)
          * @param cfg Ignite configuration.
          */
         private void initializeDataStorageConfiguration(IgniteConfiguration 
cfg) throws IgniteCheckedException {
-            if (cfg.getDataStorageConfiguration() != null &&
-                (cfg.getMemoryConfiguration() != null || 
cfg.getPersistentStoreConfiguration() != null)) {
-                throw new IgniteCheckedException("Data storage can be 
configured with either legacy " +
-                    "(MemoryConfiguration, PersistentStoreConfiguration) or 
new (DataStorageConfiguration) classes, " +
-                    "but not both.");
+            DataStorageConfiguration dsCfg = cfg.getDataStorageConfiguration();
+
+            if (dsCfg != null) {
+                if (cfg.getMemoryConfiguration() != null || 
cfg.getPersistentStoreConfiguration() != null) {
+                    throw new IgniteCheckedException("Data storage can be 
configured with either legacy " +
+                        "(MemoryConfiguration, PersistentStoreConfiguration) 
or new (DataStorageConfiguration) classes, " +
+                        "but not both.");
+                }
+
+                List<String> extraNodeStorages = 
F.asList(dsCfg.getExtraStoragePathes());
+
+                if (extraNodeStorages.size() != new 
HashSet<>(extraNodeStorages).size()
+                    || extraNodeStorages.contains(dsCfg.getStoragePath()))
+                    throw new IgniteCheckedException("Data storage 
configuration constains duplicates: " + extraNodeStorages);

Review Comment:
   Let's add what exact configuration properties we are talking about.



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