prepare immich for data volume split

clusters/base/apps/immich/helmrelease-server.yaml

@@ -14,6 +14,11 @@ spec:
     controllers:
       server:
         strategy: Recreate
+        # temporarily disabled while /data is being split into separate
+        # per-purpose Longhorn volumes (encoded-video, thumbs, backups,
+        # data) and the old combined "other" volume is preserved untouched
+        # as a fallback, remounted at /data-old.
+        replicas: 0
         podDisruptionBudget:
           maxUnavailable: "0"
         initContainers:
@@ -189,8 +194,53 @@ spec:
           server:
             mergerfs:
               - path: /dev/fuse
-      # everything immich keeps outside "library" (backups, encoded-video,
-      # profile, thumbs, upload) - plain volume, no mergerfs involved.
+      # split out of the old combined "other" volume below: each of these
+      # purposes now gets its own Longhorn volume instead of sharing one
+      # 200Gi disk, so a single hot subtree (e.g. thumbs) doesn't force
+      # replica rebuilds/relocation to drag the whole 200Gi with it.
+      data:
+        type: persistentVolumeClaim
+        accessMode: ReadWriteOnce
+        size: 20Gi
+        storageClass: longhorn
+        retain: true
+        advancedMounts:
+          server:
+            app:
+              - path: /data
+      encoded-video:
+        type: persistentVolumeClaim
+        accessMode: ReadWriteOnce
+        size: 100Gi
+        storageClass: longhorn
+        retain: true
+        advancedMounts:
+          server:
+            app:
+              - path: /data/encoded-video
+      thumbs:
+        type: persistentVolumeClaim
+        accessMode: ReadWriteOnce
+        size: 100Gi
+        storageClass: longhorn
+        retain: true
+        advancedMounts:
+          server:
+            app:
+              - path: /data/thumbs
+      backups:
+        type: persistentVolumeClaim
+        accessMode: ReadWriteOnce
+        size: 30Gi
+        storageClass: longhorn
+        retain: true
+        advancedMounts:
+          server:
+            app:
+              - path: /data/backups
+      # old combined volume (backups, encoded-video, profile, thumbs,
+      # upload) - kept mounted read-write as a fallback/reference copy at
+      # /data-old, untouched, until the split above is confirmed good.
       other:
         type: persistentVolumeClaim
         accessMode: ReadWriteOnce
@@ -200,4 +250,4 @@ spec:
         advancedMounts:
           server:
             app:
-              - path: /data
+              - path: /data-old