feat: optional dedicated WAL volume for dataservers

charts/oxia-cluster/Chart.yaml

@@ -15,7 +15,7 @@ apiVersion: v2
 name: oxia-cluster
 description: Oxia cluster
 type: application
-version: 0.0.7
+version: 0.0.8
 appVersion: "1.16.0"
 home: https://oxia-db.github.io
 sources:

charts/oxia-cluster/templates/dataserver-statefulset.yaml

@@ -100,6 +100,10 @@ spec:
           volumeMounts:
             - name: data
               mountPath: /data
+            {{- with .Values.server.wal }}
+            - name: wal
+              mountPath: {{ $.Values.server.config.storage.wal.dir }}
+            {{- end }}
             - name: daemon-config
               mountPath: /oxia/conf
               readOnly: true
@@ -165,3 +169,15 @@ spec:
         resources:
           requests:
             storage: {{ .Values.server.storage }}
+    {{- with .Values.server.wal }}
+    - metadata:
+        name: wal
+      spec:
+        accessModes: [ "ReadWriteOnce" ]
+        {{- if or .storageClassName $.Values.server.storageClassName }}
+        storageClassName: {{ .storageClassName | default $.Values.server.storageClassName }}
+        {{- end}}
+        resources:
+          requests:
+            storage: {{ .storage }}
+    {{- end }}

charts/oxia-cluster/values.yaml

@@ -57,6 +57,13 @@ server:
   memory: 1Gi
   storage: 8Gi
   #storageClassName: xxx
+  # Optionally give the WAL its own dedicated volume, mounted at the configured
+  # storage.wal.dir, so WAL fsyncs don't compete with database I/O for the same
+  # disk (and the WAL can use a different, e.g. faster, storage class).
+  # When unset, wal and database share the single "data" volume as before.
+  # wal:
+  #   storage: 8Gi
+  #   #storageClassName: xxx   # defaults to server.storageClassName
   config:
     server:
       public: