diff --git a/crates/test-utils/src/lib.rs b/crates/test-utils/src/lib.rs
index 46f215a9d..59b4f3e0c 100644
--- a/crates/test-utils/src/lib.rs
+++ b/crates/test-utils/src/lib.rs
@@ -92,6 +92,13 @@ pub struct TestECStoreEnv {
     /// `init_local_disks` + `ECStore::new` on `127.0.0.1:0` (random port keeps
     /// nextest's process-per-test parallelism safe).
     pub ecstore: Arc<ECStore>,
+    /// The single-pool, single-set topology the store was built from.
+    ///
+    /// The bootstrap does **not** publish it on the instance context (server
+    /// startup is what calls `set_endpoints`, and that write is once-only), so
+    /// a test that needs `get_global_endpoints` to resolve — admin server-info
+    /// and other topology readers — publishes this value itself.
+    pub endpoint_pools: EndpointServerPools,
 }
 
 impl TestECStoreEnv {
@@ -234,7 +241,7 @@ impl TestECStoreEnvBuilder {
         // Port 0 keeps ECStore-backed integration binaries parallel-safe under
         // nextest: no fixed peer port is ever shared between test processes.
         let server_addr: std::net::SocketAddr = "127.0.0.1:0".parse().expect("parse test addr");
-        let ecstore = ECStore::new(server_addr, endpoint_pools, CancellationToken::new())
+        let ecstore = ECStore::new(server_addr, endpoint_pools.clone(), CancellationToken::new())
             .await
             .expect("build test ECStore");
 
@@ -254,6 +261,7 @@ impl TestECStoreEnvBuilder {
             temp_root,
             disk_paths,
             ecstore,
+            endpoint_pools,
         }
     }
 }
diff --git a/rustfs/src/admin/handlers/system.rs b/rustfs/src/admin/handlers/system.rs
index 0909568e5..9df481c11 100644
--- a/rustfs/src/admin/handlers/system.rs
+++ b/rustfs/src/admin/handlers/system.rs
@@ -1541,6 +1541,84 @@ mod tests {
         assert_eq!(error.code(), &S3ErrorCode::InvalidRequest);
     }
 
+    /// `ServerInfoHandler` must answer an authorized admin request with the
+    /// per-pool erasure-set topology (rustfs/backlog#1839). That map is only
+    /// filled when the server-info query is issued with pools included, so a
+    /// handler that stopped asking for them would still return 200 with an
+    /// empty `pools` object instead of failing.
+    #[tokio::test]
+    #[serial_test::serial]
+    async fn server_info_response_carries_pool_topology() {
+        use crate::admin::runtime_sources::{AppContext, publish_test_app_context};
+        use crate::admin::storage_api::runtime::bootstrap_ctx;
+        use http_body_util::BodyExt as _;
+        use rustfs_iam::store::{Store as _, object::IAM_CONFIG_PREFIX};
+        use std::sync::Arc;
+
+        const ROOT_ACCESS_KEY: &str = "SERVERINFOROOTACCESSKEY";
+        const ROOT_SECRET_KEY: &str = "serverInfoRootSecret123";
+
+        let _ = rustfs_credentials::init_global_action_credentials(
+            Some(ROOT_ACCESS_KEY.to_string()),
+            Some(ROOT_SECRET_KEY.to_string()),
+        );
+
+        let env = rustfs_test_utils::TestECStoreEnv::builder()
+            .prefix("admin_server_info_pools")
+            .disk_count(1)
+            .init_bucket_metadata(false)
+            .build()
+            .await;
+        // Server startup owns this write in production; the test bootstrap
+        // stops short of it, and without a topology the server-info query
+        // returns before it ever looks at drives.
+        bootstrap_ctx().set_endpoints(env.endpoint_pools.clone());
+        rustfs_iam::store::object::ObjectStore::new(Arc::clone(&env.ecstore))
+            .save_iam_config(serde_json::json!({"version": 1}), format!("{}/format.json", *IAM_CONFIG_PREFIX))
+            .await
+            .expect("seed IAM format");
+        let iam = rustfs_iam::build_iam_sys(Arc::clone(&env.ecstore))
+            .await
+            .expect("build test IAM");
+        publish_test_app_context(Arc::new(AppContext::with_default_interfaces(
+            Arc::clone(&env.ecstore),
+            iam,
+            Arc::new(rustfs_kms::KmsServiceManager::new()),
+        )));
+
+        let request = S3Request {
+            input: Body::empty(),
+            method: Method::GET,
+            uri: Uri::from_static("/rustfs/admin/v3/info"),
+            headers: HeaderMap::new(),
+            extensions: Extensions::new(),
+            credentials: Some(s3s::auth::Credentials {
+                access_key: ROOT_ACCESS_KEY.to_string(),
+                secret_key: s3s::auth::SecretKey::from(ROOT_SECRET_KEY.to_string()),
+            }),
+            region: None,
+            service: None,
+            trailing_headers: None,
+        };
+
+        let (status, body) = super::ServerInfoHandler {}
+            .call(request, Params::new())
+            .await
+            .expect("root admin credentials must be served server info")
+            .output;
+        assert_eq!(status, hyper::StatusCode::OK);
+
+        let bytes = body.collect().await.expect("server info body should read").to_bytes();
+        let payload: serde_json::Value = serde_json::from_slice(&bytes).expect("server info must be json");
+        let pools = payload["info"]["pools"]
+            .as_object()
+            .expect("server info must carry a pools object");
+        assert!(
+            pools.contains_key("0"),
+            "server info must report the erasure-set topology of pool 0, got {pools:?}"
+        );
+    }
+
     /// Authorization denial for this exact action is pinned to AccessDenied by
     /// `crate::admin::auth::tests::non_admin_credential_is_denied`.
     #[test]
diff --git a/rustfs/src/admin/route_registration_test.rs b/rustfs/src/admin/route_registration_test.rs
index e81f13d17..e48e09c94 100644
--- a/rustfs/src/admin/route_registration_test.rs
+++ b/rustfs/src/admin/route_registration_test.rs
@@ -1412,23 +1412,6 @@ fn test_health_routes_not_registered_when_disabled_by_env() {
     });
 }
 
-#[test]
-fn test_phase5_admin_info_contract() {
-    let system_src = include_str!("handlers/system.rs");
-
-    let server_info_impl_marker = "impl Operation for ServerInfoHandler";
-    let server_info_impl_start = system_src
-        .find(server_info_impl_marker)
-        .expect("Expected impl Operation for ServerInfoHandler in handlers/system.rs");
-    let server_info_impl_block = &system_src[server_info_impl_start..];
-
-    assert!(
-        server_info_impl_block.contains("default_admin_usecase()")
-            && server_info_impl_block.contains("execute_query_server_info(QueryServerInfoRequest { include_pools: true })"),
-        "admin server info path must be served through admin runtime-source DefaultAdminUsecase::execute_query_server_info"
-    );
-}
-
 fn extract_block_between_markers<'a>(src: &'a str, start_marker: &str, end_marker: &str) -> &'a str {
     let start = src
         .find(start_marker)
diff --git a/rustfs/src/admin/storage_api.rs b/rustfs/src/admin/storage_api.rs
index ec89f5e4e..dbf3a81df 100644
--- a/rustfs/src/admin/storage_api.rs
+++ b/rustfs/src/admin/storage_api.rs
@@ -948,6 +948,10 @@ pub(crate) mod runtime {
 
     #[cfg(test)]
     pub(crate) use super::{Endpoint, Endpoints, PoolEndpoints};
+    /// Test-only: the process instance context, so a handler test can publish
+    /// the endpoint topology that server startup normally installs.
+    #[cfg(test)]
+    pub(crate) use crate::storage::storage_api::ecstore_runtime::bootstrap_ctx;
 }
 
 pub(crate) mod s3 {