Document duplicate Proxmox storage cleanup

docs/proxmox/storage-layout.md

@@ -189,6 +189,30 @@ Expected result:
 - `local` no longer appears in `pvesm status`;
 - `/var/lib/vz` remains the backing path.
 
+If both `local` and `iso-templates` still appear, they are duplicate storage
+definitions pointing to the same path. This does not duplicate data, but it does
+make the UI confusing. Remove the old definition again:
+
+```bash
+pvesm remove local
+pvesm status
+cat /etc/pve/storage.cfg
+```
+
+If `local` still remains in `/etc/pve/storage.cfg`, edit the file and remove
+only this block:
+
+```text
+dir: local
+	path /var/lib/vz
+	content iso,images,backup,vztmpl,snippets,rootdir
+	prune-backups keep-all=1
+```
+
+Leave the `dir: iso-templates` block in place. Editing `storage.cfg` changes
+only Proxmox's storage definitions; it does not delete the files in
+`/var/lib/vz`.
+
 ## Create `vm-lxc-disks` on the 2 TB Disk
 
 On this fresh host, rebuild the 2 TB disk from scratch as a dedicated LVM-thin