added Lustre tuning guide to index

Author: fawzi

docs/guides/lustre-tuning.md

@@ -28,5 +28,5 @@ With it it is possible to create a Progressive file layout switching `--stripe-c
 
 `iopsstor` uses SSD as OST, thus random access is quick, and the performance of the single OST is high. `capstor` on another hand uses harddisks, it has a larger capacity, and  it also have many more OSS, thus the total bandwidth is larger.
 
-!!! Note ML usage
-    model training normally has better performance if reading from iopsstor (random access), checkpoint can be done to capstor (very good for contiguous access)
+!!! Note
+    ML model training normally has better performance if reading from iopsstor (random access, difficult to predict access pattern). Checkpoint can be done to capstor (very good for contiguous access).

mkdocs.yml

@@ -112,6 +112,7 @@ nav:
     - guides/index.md
     - 'Internet Access on Alps': guides/internet-access.md
     - 'Storage': guides/storage.md
+    - 'Lustre tuning': guides/lustre-tuning.md
     - 'Using the terminal': guides/terminal.md
     - 'MLP Tutorials':
       - guides/mlp_tutorials/index.md