diff --git a/dbms/src/Storages/MergeTree/MergeTreePartInfo.h b/dbms/src/Storages/MergeTree/MergeTreePartInfo.h
index 4bc660c84f1..a5be3010f95 100644
--- a/dbms/src/Storages/MergeTree/MergeTreePartInfo.h
+++ b/dbms/src/Storages/MergeTree/MergeTreePartInfo.h
@@ -40,6 +40,10 @@ struct MergeTreePartInfo
 
     String getPartName() const;
     String getPartNameV0(DayNum_t left_date, DayNum_t right_date) const;
+    UInt64 getBlocksCount() const
+    {
+        return static_cast<UInt64>(max_block - min_block + 1);
+    }
 
     static MergeTreePartInfo fromPartName(const String & part_name, MergeTreeDataFormatVersion format_version);
 
diff --git a/dbms/src/Storages/StorageReplicatedMergeTree.cpp b/dbms/src/Storages/StorageReplicatedMergeTree.cpp
index 14cc102f609..42023e82e4e 100644
--- a/dbms/src/Storages/StorageReplicatedMergeTree.cpp
+++ b/dbms/src/Storages/StorageReplicatedMergeTree.cpp
@@ -741,6 +741,7 @@ void StorageReplicatedMergeTree::checkParts(bool skip_sanity_checks)
 
     /// Which local parts to added into ZK.
     MergeTreeData::DataPartsVector parts_to_add;
+    UInt64 parts_to_add_rows = 0;
 
     /// Which parts should be taken from other replicas.
     Strings parts_to_fetch;
@@ -756,6 +757,7 @@ void StorageReplicatedMergeTree::checkParts(bool skip_sanity_checks)
             {
                 parts_to_add.push_back(containing);
                 unexpected_parts.erase(containing);
+                parts_to_add_rows += containing->rows_count;
             }
         }
         else
@@ -768,21 +770,53 @@ void StorageReplicatedMergeTree::checkParts(bool skip_sanity_checks)
     for (const String & name : parts_to_fetch)
         expected_parts.erase(name);
 
+
     /** To check the adequacy, for the parts that are in the FS, but not in ZK, we will only consider not the most recent parts.
       * Because unexpected new parts usually arise only because they did not have time to enroll in ZK with a rough restart of the server.
       * It also occurs from deduplicated parts that did not have time to retire.
       */
     size_t unexpected_parts_nonnew = 0;
+    UInt64 unexpected_parts_nonnew_rows = 0;
+    UInt64 unexpected_parts_rows = 0;
     for (const auto & part : unexpected_parts)
+    {
         if (part->info.level > 0)
+        {
             ++unexpected_parts_nonnew;
+            unexpected_parts_nonnew_rows += part->rows_count;
+        }
 
-    String sanity_report = "There are "
-            + toString(unexpected_parts.size()) + " unexpected parts ("
-            + toString(unexpected_parts_nonnew) + " of them is not just-written), "
-            + toString(parts_to_add.size()) + " unexpectedly merged parts, "
-            + toString(expected_parts.size()) + " missing obsolete parts, "
-            + toString(parts_to_fetch.size()) + " missing parts";
+        unexpected_parts_rows += part->rows_count;
+    }
+
+
+    /// Additional helpful statistics
+    auto get_blocks_count_in_data_part = [&] (const String & part_name) -> UInt64
+    {
+        MergeTreePartInfo part_info;
+        if (MergeTreePartInfo::tryParsePartName(part_name, &part_info, data.format_version))
+            return part_info.getBlocksCount();
+
+        LOG_ERROR(log, "Unexpected part name: " << part_name);
+        return 0;
+    };
+
+    UInt64 parts_to_fetch_blocks = 0;
+    for (const String & name : parts_to_fetch)
+        parts_to_fetch_blocks += get_blocks_count_in_data_part(name);
+
+    UInt64 expected_parts_blocks = 0;
+    for (const String & name : expected_parts)
+        expected_parts_blocks += get_blocks_count_in_data_part(name);
+
+
+    std::stringstream sanity_report;
+    sanity_report << "There are "
+        << unexpected_parts.size() << " unexpected parts with " << unexpected_parts_rows << " rows ("
+        << unexpected_parts_nonnew << " of them is not just-written with " << unexpected_parts_rows << " rows), "
+        << parts_to_add.size() << " unexpectedly merged parts with " << parts_to_add_rows << " rows, "
+        << expected_parts.size() << " missing obsolete parts (with " << expected_parts_blocks << " blocks), "
+        << parts_to_fetch.size() << " missing parts (with " << parts_to_fetch_blocks << " blocks).";
 
     /** We can automatically synchronize data,
       *  if the ratio of the total number of errors to the total number of parts (minimum - on the local filesystem or in ZK)
@@ -793,17 +827,28 @@ void StorageReplicatedMergeTree::checkParts(bool skip_sanity_checks)
       * In this case, the protection mechanism does not allow the server to start.
       */
 
-    size_t min_parts_local_or_expected = std::min(expected_parts_vec.size(), parts.size());
-    size_t total_difference = parts_to_add.size() + unexpected_parts_nonnew + parts_to_fetch.size();
+    UInt64 total_rows_on_filesystem = 0;
+    for (const auto & part : parts)
+        total_rows_on_filesystem += part->rows_count;
 
-    bool insane = total_difference > min_parts_local_or_expected * data.settings.replicated_max_ratio_of_wrong_parts;
+    UInt64 total_suspicious_rows = parts_to_add_rows + unexpected_parts_rows;
+    UInt64 total_suspicious_rows_no_new = parts_to_add_rows + unexpected_parts_nonnew_rows;
+
+    bool insane = total_suspicious_rows > total_rows_on_filesystem * data.settings.replicated_max_ratio_of_wrong_parts;
 
     if (insane && !skip_sanity_checks)
-        throw Exception("The local set of parts of table " + getTableName() + " doesn't look like the set of parts in ZooKeeper. "
-            + sanity_report, ErrorCodes::TOO_MANY_UNEXPECTED_DATA_PARTS);
+    {
+        std::stringstream why;
+        why << "The local set of parts of table " << database_name  << "." << table_name << " doesn't look like the set of parts "
+            << "in ZooKeeper: "
+            << formatReadableQuantity(total_suspicious_rows) << " rows of " << formatReadableQuantity(total_rows_on_filesystem)
+            << " total rows in filesystem are suspicious.";
 
-    if (total_difference > 0)
-        LOG_WARNING(log, sanity_report);
+        throw Exception(why.str() + " " + sanity_report.str(), ErrorCodes::TOO_MANY_UNEXPECTED_DATA_PARTS);
+    }
+
+    if (total_suspicious_rows_no_new > 0)
+        LOG_WARNING(log, sanity_report.str());
 
     /// Add information to the ZK about the parts that cover the missing parts.
     for (const MergeTreeData::DataPartPtr & part : parts_to_add)
diff --git a/dbms/tests/integration/test_random_inserts/test.sh b/dbms/tests/integration/test_random_inserts/test.sh
index 76f1b05e61e..9022f307d56 100755
--- a/dbms/tests/integration/test_random_inserts/test.sh
+++ b/dbms/tests/integration/test_random_inserts/test.sh
@@ -2,9 +2,9 @@
 #set -e
 
 [[ -n "$1" ]] && host="$1" || host="localhost"
-[[ -n "$2" ]] && min_timestamp="$2" || min_timestamp=$(( $(date +%s) - 10 ))
-[[ -n "$3" ]] && max_timestamp="$3" || max_timestamp=$(( $(date +%s) + 10 ))
-[[ -n "$4" ]] && iters_per_timestamp="$4" || iters_per_timestamp=1
+[[ -n "$2" ]] && min_timestamp="$2" || min_timestamp=$(( $(date +%s) - 60 ))
+[[ -n "$3" ]] && max_timestamp="$3" || max_timestamp=$(( $(date +%s) + 60 ))
+[[ -n "$4" ]] && iters_per_timestamp="$4" || iters_per_timestamp=5
 
 timestamps=`seq $min_timestamp $max_timestamp`