diff --git a/services/logging/opensearch-helmrelease.yaml b/services/logging/opensearch-helmrelease.yaml
index 0ea0e5ce..d74c9edd 100644
--- a/services/logging/opensearch-helmrelease.yaml
+++ b/services/logging/opensearch-helmrelease.yaml
@@ -79,6 +79,7 @@ spec:
     persistence:
       enabled: true
       storageClass: asteria
+      # Historical immutable claim template; opensearch-pvc.yaml owns live size.
       size: 500Gi
     config:
       opensearch.yml: |
diff --git a/services/logging/opensearch-pvc.yaml b/services/logging/opensearch-pvc.yaml
index f537b994..36f647bd 100644
--- a/services/logging/opensearch-pvc.yaml
+++ b/services/logging/opensearch-pvc.yaml
@@ -9,6 +9,7 @@ spec:
     - ReadWriteOnce
   resources:
     requests:
-      storage: 1024Gi
+      # Existing logs occupied 94% of 1Ti; keep headroom below disk watermarks.
+      storage: 1280Gi
   storageClassName: asteria
   volumeMode: Filesystem