feat(em): update doc custom partitioning

Author: bene2k1

pages/elastic-metal/how-to/configure-disk-partitions.mdx

@@ -7,40 +7,54 @@ content:
   paragraph: This guide explains how to configure custom disk partitions on Scaleway Elastic Metal servers.
 tags: attach, detach, flexible-ip, elastic-metal
 dates:
-  validation: 2024-10-01
+  validation: 2025-03-25
   posted: 2024-10-01
 categories:
   - bare-metal
 ---
 
-Scaleway Elastic Metal servers come with a default partition layout, suitable for most users and intended to speed up and simplify the installation process of the server.
-However, if you have specific requirements, you can define custom partitioning of your machine using a JSON configuration during server installation.
+Scaleway Elastic Metal servers come with a default partition layout designed for most users, optimizing installation speed and ease of use.
+However, if you have specific requirements, you can define a custom partition layout. Partitioning can be configured using either a simplified visual interface or an advanced JSON configuration during server installation.
 
 <Message type="tip">
-    You can change the partitioning of your server during installation or re-installation only.
-    Be aware that all your data will be deleted if you reinstall your server.
+    You can change the partitioning of your server only during installation or reinstallation.
+    Be aware that all data will be deleted if you reinstall your server.
 </Message>
 
+
 <Macro id="requirements" />
 - A Scaleway account logged into the [console](https://console.scaleway.com)
 - [Owner](/iam/concepts/#owner) status or [IAM permissions](/iam/concepts/#permission) allowing you to perform actions in the intended Organization
 - An [SSH key](/organizations-and-projects/how-to/create-ssh-key/)
 - An [Elastic Metal server](/elastic-metal/quickstart/#how-to-create-an-elastic-metal-server)
 
-## Example configuration
+## Simplified partitioning (visual interface)
+
+During [server installation](/elastic-metal/how-to/install-server/), navigate to step 5 of the creation wizard and click **Custom Configuration** > **Simplified Partitioning**.
+
+- Enable or disable partitions for SWAP and the secondary `/data` partition by selecting or deselecting checkboxes.
+- Define the mount point for the secondary `/data` partition as needed.
+
+This method is ideal for users who prefer a simplified setup without manually specifying partition details.
 
-During [server installation](/elastic-metal/) click **Advanced JSON** configuration in step 5 of the server creation wizard.
-You can then edit the partition configuration directly in the editor within your browser. The configuration is done via a JSON description of the partitioning.
-Below is an example of how to define a partitioning schema with RAID and NVMe disks.
+## Advanced JSON partitioning
+
+For users requiring granular control, Scaleway offers an advanced partitioning method using JSON.
+
+1. During [server installation](/elastic-metal/how-to/install-server/), navigate to step 5 and click **Custom Configuration** > **Advanced JSON**.
+2. Edit the partition schema directly in the browser-based editor.
+3. Use JSON to define disk partitions, RAID arrays, and file systems.
 
 <Message type="important">
-    - Disk Type Naming: Device names differ based on the disk type. For example, HDD/SSD will use `/dev/sdXXX`, while NVMe devices use `/dev/nvmeXXX`.
-    - UEFI Partition: The EFI partition should only exist if the server uses UEFI. If UEFI is not in use, this partition should be omitted.
-    - ZFS and LVM: ZFS is optional and can be configured if needed, while LVM should not be used for now due to functionality issues.
+    - **Disk Type Naming:** HDD/SSD devices use `/dev/sdXXX`, while NVMe devices use `/dev/nvmeXXX`.
+    - **UEFI Partition:** The EFI partition should only exist if the server uses UEFI. Omit this partition if UEFI is not used.
+    - **ZFS and LVM:** ZFS is optional, but LVM should not be used due to functionality issues.
 </Message>
 
+### Example JSON configuration
+
 <Message type="tip">
-    Refer to the Elastic Metal API documentation for a complete overview of the expected values for file system types, RAID configurations, and other related parameters required for partitioning. For more details, visit the [Scaleway Elastic Metal API Documentation – Default Partitioning Schema](https://www.scaleway.com/en/developers/api/elastic-metal/#path-partitioning-schemas-get-default-partitioning-schema).
+    Refer to the [Elastic Metal API documentation](https://www.scaleway.com/en/developers/api/elastic-metal/#path-partitioning-schemas-get-default-partitioning-schema) for valid file system types, RAID configurations, and partitioning parameters.
 </Message>
 
 ```json

pages/elastic-metal/how-to/create-server.mdx

@@ -35,7 +35,7 @@ Scaleway [Elastic Metal servers](https://www.scaleway.com/en/elastic-metal/) pro
     - Choose your preferred billing method: **hourly** or **monthly**.
     - Select a server configuration from the available options.
     - Choose an OS to run on your server or opt for no preinstalled image.
-    - Configure server partitioning. You can either choose a default configuration or [configure your own partitioning](/elastic-metal/how-to/configure-disk-partitions/) using a JSON configuration.
+    - Configure server partitioning. You can either choose a default configuration or [configure your own partitioning](/elastic-metal/how-to/configure-disk-partitions/).
     - Enter a name and, optionally, add tags to identify your server.
     - Add your SSH key (required if installing an image on your server). Depending on the OS image, you may also be asked to configure the panel user for your server.
     - Optionally, configure the available public bandwidth for your server. This option may not be available for all offers.

pages/elastic-metal/how-to/install-server.mdx

@@ -32,7 +32,7 @@ If you ordered your server without a preinstalled operating system, you can inst
 2. Click **Install** next to the server you want to install. The server installation wizard displays.
 3. Select the operating system you want to install on the machine.
    <Message type="note">
-      Elastic Metal servers are installed with a default partition layout. For custom partitioning, you can manually reinstall your server using [remote access](/elastic-metal/how-to/activate-remote-access/).
+      Elastic Metal servers are installed with a default partition layout. For custom partitioning, read our dedicated documenation [How to configure custom disk partitioning](/elastic-metal/how-to/configure-disk-partitions/).
    </Message>
 4. Add your [SSH key](/organizations-and-projects/concepts/#ssh-key). If you have already [uploaded a key](/organizations-and-projects/how-to/create-ssh-key/#how-to-upload-the-public-ssh-key-to-the-scaleway-interface), it will appear in the list of keys. Select the keys to grant access to the server by checking the corresponding boxes.
 5. Click **Install server** to begin the installation process.