Refine data transfer examples to horse

doc.zih.tu-dresden.de/docs/jobs_and_resources/barnard_test.md

@@ -239,17 +239,22 @@ target filesystems.
 
     === "Source: old `/ssd`"
 
+        The old `ssd` filesystem is mounted at `/data/old/lustre/ssd` on the datamover nodes and the
+        workspaces are within the subdirectory `ws/`. A corresponding data transfer using `dtcopy`
+        looks like
+
         ```console
-        marie@barnard$ dtcopy --recursive /data/old/lustre/ssd/ /data/horse/ws/marie-numbercrunch
+        marie@barnard$ dtcopy --recursive /data/old/lustre/ssd/ws/marie-numbercrunch /data/horse/ws/marie-numbercrunch
         ```
 
     === "Source: old `/beegfs`"
 
-        The old `beegfs` filesystem is mounted at `/data/old/beegfs` the datamover nodes. You need to
-        invoke a `dtcopy` command to transfer data to a workspace in `/data/horse`, e.g.,
+        The old `beegfs` filesystem is mounted at `/data/old/beegfs` on the datamover nodes and the
+        workspaces are within the subdirectories `ws/0` and `ws/1`, respectively. A corresponding
+        data transfer using `dtcopy` looks like
 
         ```console
-        marie@barnard$ dtcopy --recursive /data/old/beegfs/ /data/horse/ws/marie-numbercrunch
+        marie@barnard$ dtcopy --recursive /data/old/beegfs/ws/0/marie-numbercrunch /data/horse/ws/marie-numbercrunch
         ```
 
 ??? "Migration to `/data/walrus`"