rewording first sentence, there are multiple storage systems not one.… (#129)

Author: mpasserini

docs/alps/storage.md

@@ -3,9 +3,8 @@
 
 !!! under-construction
 
-Alps has different storage attached, each with characteristics suited to different workloads and use cases.
-HPC storage is managed in a separate cluster of nodes that host servers that manage the storage and the physical storage drives.
-These separate storage clusters are on the same Slingshot 11 network as Alps.
+The Alps infrastructure offers multiple storage solutions, each with characteristics suited to different workloads and use cases.
+HPC storage is provided by independent clusters, composed of servers and physical storage drives.
 
 |              | Capstor                | Iopsstor               | VAST                |
 |--------------|------------------------|------------------------|---------------------|
@@ -18,29 +17,25 @@ These separate storage clusters are on the same Slingshot 11 network as Alps.
 | IOPs         | 1.5M                   | 8.6M read, 24M write   | 200k read, 768k write |
 | file create/s| 374k                   | 214k                   | 97k                 |
 
-
-!!! todo
-    Information about Lustre. Meta data servers, etc.
-
-    * how many meta data servers on Capstor and Iopsstor
-    * how these are distributed between store/scratch
-
-    Also discuss how Capstor and iopstor are used to provide both scratch / store / other file systems
+Capstor and Iopsstor are on the same Slingshot network as Alps, while VAST is on the CSCS Ethernet network.
 
 The mounts, and how they are used for Scratch, Store, and Home file systems that are mounted on clusters are documented in the [file system docs][ref-storage-fs].
 
 [](){#ref-alps-capstor}
 ## Capstor
 
-Capstor is the largest file system, for storing large amounts of input and output data.
+Capstor is the largest file system, and it is meant for storing large amounts of input and output data.
 It is used to provide [scratch][ref-storage-scratch] and [store][ref-storage-store].
 
-!!! todo "add information about meta data services, and their distribution over scratch and store"
+Capstor has 80 Object Storage Servers ([OSS](https://wiki.lustre.org/Lustre_Object_Storage_Service_(OSS))), and 6 Metadata Servers ([MDS](https://wiki.lustre.org/Lustre_Metadata_Service_(MDS))). 
+Two of of these Metadata servers are dedicated for Store, and the remaining four are dedicated for Scratch.
 
 [](){#ref-alps-capstor-scratch}
 ### Scratch
 
 All users on Alps get their own scratch path on Alps, `/capstor/scratch/cscs/$USER`.
+Since Capstor OSSs are made of HDDs, Capstor is a storage well suited for jobs which perform large sequential and parallel read/write operations.
+See the [Scratch documentation][ref-storage-scratch] for more information.
 
 [](){#ref-alps-capstor-store}
 ### Store
@@ -51,15 +46,18 @@ It is mounted on clusters at the `/capstor/store` mount point, with folders crea
 [](){#ref-alps-iopsstor}
 ## Iopsstor
 
-!!! todo
-    small text explaining what Iopsstor is designed to be used for.
+Iopsstor is a smaller filesystem compared to Capstor, but it leverages high-performance NVMe drives, which offer significantly better speed and responsiveness than traditional HDDs.
+It is primarily used as a scratch space, and it is optimized for IOPS-intensive workloads. 
+This makes it particularly well-suited for applications that involve frequent, random read and write operations within files.
+
+Iopsstor has has 20 OSSs, and 2 MDSs. 
 
 [](){#ref-alps-vast}
 ## VAST
 
 The VAST storage is smaller capacity system that is designed for use as [Home][ref-storage-home] folders.
 
 !!! todo
-    small text explaining what Iopsstor is designed to be used for.
+    small text explaining what VAST is designed to be used for.