diff --git a/.buildkite/test_areas/disaggregated.yaml b/.buildkite/test_areas/disaggregated.yaml
index 0100b99993ef..26eee8dcdbc7 100644
--- a/.buildkite/test_areas/disaggregated.yaml
+++ b/.buildkite/test_areas/disaggregated.yaml
@@ -115,21 +115,23 @@ steps:
 
 - label: ":nvidia: (L4) Hybrid SSM NixlConnector PD accuracy"
   key: hybrid-ssm-nixlconnector-pd-accuracy-tests-4-gpus
-  timeout_in_minutes: 60
+  timeout_in_minutes: 30
   working_dir: "/vllm-workspace/tests"
   device: l4
   num_devices: 4
+  parallelism: 4
   source_file_dependencies:
     - vllm/distributed/kv_transfer/kv_connector/v1/nixl/
     - tests/v1/kv_connector/nixl_integration/
   commands:
     - bash /vllm-workspace/.buildkite/scripts/install-kv-connectors.sh
-    - HYBRID_SSM=1 bash v1/kv_connector/nixl_integration/config_sweep_accuracy_test.sh
+    - HYBRID_SSM=1 CONFIG_SHARD_ID=$$BUILDKITE_PARALLEL_JOB CONFIG_NUM_SHARDS=$$BUILDKITE_PARALLEL_JOB_COUNT bash v1/kv_connector/nixl_integration/config_sweep_accuracy_test.sh
   mirror:
     amd:
       label: ":amd: (MI300) Hybrid SSM NixlConnector PD accuracy"
       dind: false
       device: mi300_4
+      parallelism: 1
       timeout_in_minutes: 55
       depends_on:
         - image-build-amd
diff --git a/tests/v1/kv_connector/nixl_integration/config_sweep_accuracy_test.sh b/tests/v1/kv_connector/nixl_integration/config_sweep_accuracy_test.sh
index 8acc96413327..96e6e45e194a 100755
--- a/tests/v1/kv_connector/nixl_integration/config_sweep_accuracy_test.sh
+++ b/tests/v1/kv_connector/nixl_integration/config_sweep_accuracy_test.sh
@@ -55,6 +55,32 @@ else
   configs=("${tp_configs[@]}")
 fi
 
+# Opt-in CI sharding; unset means run every config for existing callers.
+if [[ -n "${CONFIG_SHARD_ID:-}" || -n "${CONFIG_NUM_SHARDS:-}" ]]; then
+  if [[ ! "${CONFIG_SHARD_ID:-}" =~ ^(0|[1-9][0-9]*)$ ]] ||
+    [[ ! "${CONFIG_NUM_SHARDS:-}" =~ ^[1-9][0-9]*$ ]]; then
+    echo "CONFIG_SHARD_ID and CONFIG_NUM_SHARDS must be non-negative and positive integers, respectively."
+    exit 1
+  fi
+  if (( CONFIG_SHARD_ID >= CONFIG_NUM_SHARDS )); then
+    echo "CONFIG_SHARD_ID=${CONFIG_SHARD_ID} must be less than CONFIG_NUM_SHARDS=${CONFIG_NUM_SHARDS}."
+    exit 1
+  fi
+
+  shard_configs=()
+  for idx in "${!configs[@]}"; do
+    if (( idx % CONFIG_NUM_SHARDS == CONFIG_SHARD_ID )); then
+      shard_configs+=("${configs[$idx]}")
+    fi
+  done
+  if (( ${#shard_configs[@]} == 0 )); then
+    echo "Shard ${CONFIG_SHARD_ID}/${CONFIG_NUM_SHARDS} selected no configs."
+    exit 1
+  fi
+  configs=("${shard_configs[@]}")
+  echo "Shard ${CONFIG_SHARD_ID}/${CONFIG_NUM_SHARDS}: running ${#configs[@]} configs"
+fi
+
 run_tests() {
   local label=$1
   local extra_args=$2