diff --git a/clickhouse-admin/types/src/config.rs b/clickhouse-admin/types/src/config.rs
index 742b442bf3e..aa506843631 100644
--- a/clickhouse-admin/types/src/config.rs
+++ b/clickhouse-admin/types/src/config.rs
@@ -201,9 +201,13 @@ impl ReplicaConfig {
         <max_tasks_in_queue>1000</max_tasks_in_queue>
      </distributed_ddl>
 
-     <!-- Disable sparse column serialization, which we expect to not need -->
      <merge_tree>
+        <!-- Disable sparse column serialization, which we expect to not need -->
         <ratio_of_defaults_for_sparse_serialization>1.0</ratio_of_defaults_for_sparse_serialization>
+
+        <!-- Prevent ClickHouse from setting distributed tables to read-only. -->
+        <!-- See https://github.com/oxidecomputer/omicron/issues/8595 for details. -->
+        <replicated_max_ratio_of_wrong_parts>1.0</replicated_max_ratio_of_wrong_parts>
     </merge_tree>
 {macros}
 {remote_servers}
diff --git a/clickhouse-admin/types/testutils/replica-server-config.xml b/clickhouse-admin/types/testutils/replica-server-config.xml
index 121ea072ebd..5df15ffe394 100644
--- a/clickhouse-admin/types/testutils/replica-server-config.xml
+++ b/clickhouse-admin/types/testutils/replica-server-config.xml
@@ -104,9 +104,13 @@
         <max_tasks_in_queue>1000</max_tasks_in_queue>
      </distributed_ddl>
 
-     <!-- Disable sparse column serialization, which we expect to not need -->
      <merge_tree>
+        <!-- Disable sparse column serialization, which we expect to not need -->
         <ratio_of_defaults_for_sparse_serialization>1.0</ratio_of_defaults_for_sparse_serialization>
+
+        <!-- Prevent ClickHouse from setting distributed tables to read-only. -->
+        <!-- See https://github.com/oxidecomputer/omicron/issues/8595 for details. -->
+        <replicated_max_ratio_of_wrong_parts>1.0</replicated_max_ratio_of_wrong_parts>
     </merge_tree>
 
     <macros>