scaleway · SamyOubouaziz · Jul 16, 2025 · Jul 1, 2025 · Jul 8, 2025 · Jul 9, 2025
diff --git a/menu/navigation.json b/menu/navigation.json
@@ -300,6 +300,10 @@
                   {
                     "label": "Instances footprint calculation",
                     "slug": "instances-env-footprint"
+                  },
+                  {
+                    "label": "Block Storage footprint calculation",
+                    "slug": "block-storage-env-footprint"
                   }
                 ],
                 "label": "Additional Content",

@@ -41,7 +41,7 @@ The manufacturing impact is prorated based on the server's lifespan and the dura
 
 ## Calculation example
 
-For the use of an Elastic Metal server, with a lifespan of 6 years (52 560 hours) and power of 110w, for 100 hours and considering via Boavizta estimates that the impact of the manufacturing of this server is 850 kgCo2e, we make the following calculation:
+For the use of an Elastic Metal server, with a lifespan of 6 years (52 560 hours) and power of 110w, for 100 hours and considering via [Boavizta estimates](https://doc.api.boavizta.org/) that the impact of the manufacturing of this server is 850 kgCo2e, we make the following calculation:
 
 ```math
 ServerManufacturing = (100 / 52560) * 850 = 1,62 kgCO2e
@@ -52,5 +52,5 @@ Therefore 1,62 kgCO2e is added to the total manufacturing impact of this server.
 To calculate the usage, we consider the French energy mix and the datacenter's PUE. In this example, they are O,056kgCo2e/kwh and 1,16, respectively. Which results in:
 
 ```math
-UsageFootprint = 0,110 x 100 x 0,056 x 1,16 = 0,715 kgCo2e
+UsageFootprint = 0,110 * 100 * 0,056 * 1,16 = 0,715 kgCo2e
 ```
@@ -0,0 +1,77 @@
+---
+meta:
+  title: Block Storage footprint calculation
+  description: This page explains how Scaleway calculates the environmental footprint of its Block Storage in detail.
+content:
+  h1: Block Storage footprint calculation
+  paragraph: This page explains how Scaleway calculates the environmental footprint of its Block Storage in detail.
+tags: block-storage environmental-footprint impact datacentre
+dates:
+  validation: 2025-07-10
+  posted: 2025-07-10
+categories:
+  - environmental-footprint
+  - block-storage
+---
+
+This page includes the specificities of the environmental footprint calculation for Block Storage.
+
+## Calculation aspects
+
+The total estimated impact of Block Storage volumes is calculated by integrating the:
+
+- **Manufacturing impact** - Related to the physical servers hosting the storage volumes.
+- **Usage Impact** - The impact of the tools used to manage the Block Storage offers: control plane, monitoring, internal load balancers, and others.
+- **Energy usage impact** - The average electricity consumption of storage servers and their energy efficiency.
+
+### Ratio per storage volume
+
+To allocate the impact of a Block Storage volume, we apply the unit resulting from the RCP allocation rule to all calculation steps, the `bls_ratio`:
+
+```
+bls_ratio = VOLsto/VolstoPool
+```
+
+- **VOLsto** - represents the **reserved volume** per user. In Block Storage, your data is replicated three times on multiple nodes to guarantee availability, so the **VOLsto** is applied with factor of 3 to account for replication.
+- **VolstoPool** - represents all the storage for Block Storage volumes on the server that hosts them (around 60%).
+
+In the example below we consider a **Volsto** of 600 and a **VolstoPool** of 1000.
+
+```
+bls_ratio = 600/1000 = 0,6
+```
+
+### Manufacturing impact
+
+The calculation of the manufacturing impact of Block Storage volumes is based on:
+
+- The fabrication impact of servers that host user storage
+- The fabrication impact of servers used by the Scaleway Block Storage team to manage the service - on both the Control and Data planes
+
+The calculation is the same used for [measuring the impact of manufacturing for Bare Metal servers](/environmental-footprint/additional-content/environmental-footprint-calculator/#customer-servers), but for Block Storage we also apply the `bls_ratio` to break the impact down to only the allocated volumes.
+
+#### Calculation example
+
+For the example below, we consider a single server with a lifespan of 6 years (52 560 hours) and power of 110w. We measure the impact of 100 hours and consider through [Boavizta estimates](https://www.boavizta.org/) that the impact of the manufacturing of this server is 850 kgCo2e. Also considering a `bls_ratio` of 0,6, we make the following calculation:
+
+```
+VolumeManufacturingImpact = (100 / 52560) * 850 * 0,6 = 0,97 kgCO2e
+```
+
+### Usage impact
+
+The calculation of the usage impact of Block Storage volumes is based on:
+
+- The usage of servers that host user storage
+- The usage of infrastructure and service management servers by the Scaleway Block Storage team to run the Block Storage service. In this case we consider both the Control and Data planes.
+- The impact of the electrical power dedicated to Block Storage across the infrastructure
+
+To calculate the usage, we consider the French energy mix and the datacenter's PUE.
+
+In the example below, they are O,065kgCo2e/kwh and 1,16, respectively. Considering an electrical consumption of 600wh, 100 hours of usage, and a `bls_ratio` of 0,6, the total usage impact comes down to:
+
+```math
+UsageImpact = (0,600 x 0,065) * 100 * 0,6 = 2,34 kgCo2e
+```
+
+
@@ -134,6 +134,7 @@ You can find the calculation specifications for each of the available products i
 
 - [Bare Metal](/environmental-footprint/additional-content/bare-metal-env-footprint)
 - [Instances](/environmental-footprint/additional-content/instances-env-footprint)
+- [Block Storage](/environmental-footprint/additional-content/block-storage-env-footprint)
 
 ### Cross-IT equipment & stock
 

@@ -19,22 +19,22 @@ The following tables provide details about the Scaleway products that currently
 
 | **Product Name**           | **Environmental Footprint calculator available**     |
 |----------------------------|---------------------------------|
-| Elastic Metal              | **Yes**          |
 | Apple Silicon              | **Yes**                 |
-| CPU Instances                  | **Yes**                 |
+| CPU Instances              | **Yes**                 |
+| Block Storage              | **Yes**                 |
+| Elastic Metal              | **Yes**                 |
 
 ## Planned product integration
 
 | **Product Name**           | **Environmental Footprint calculator available**    |
 |----------------------------|---------------------------------|
 | Dedibox                    | **Integration ongoing**                 |
-| Block Storage              | **Integration ongoing**                       |
+| Object Storage             | **Integration ongoing**                     |
 | GPU Instances              | **Not integrated yet**                 |
 | Kubernetes                 | **Not integrated yet**                  |
 | Container Registry         | **Not integrated yet**                   |
 | Managed Inference          | **Not integrated yet**                 |
 | Generative APIs            | **Not integrated yet**                 |
-| Object Storage             | **Not integrated yet**                     |
 | Managed Databases for PostgreSQL and MySQL         | **Not integrated yet**                 |
 | Serverless Functions       | **Not integrated yet**                  |
 | Serverless Containers      | **Not integrated yet**                  |

@@ -36,7 +36,7 @@ The calculation using the elements above can be broken down into:
     - Energy mix of the country that provides the electricity.
 
 ### Usage Impact
-    - Resources consumed by the Instance, calculated based on the material specifications of the hypervisors.
+    - Resources consumed by the Instance, [calculated based on the material specifications of the hypervisors](#electricity-consumption-calculation).
 
 ### Indirect Emissions
     - Impact related to cross-functional services necessary to guarantee the operation of the Instance, such as network and shared storage.
@@ -57,7 +57,7 @@ Refer to the table below to understand how the `Resources_Used_VM` is integrated
 
 To obtain an accurate calculation of the Instance's footprint, we multiply the results in each step of the [basis calculation](/environmental-footprint/additional-content/environmental-footprint-calculator/), bar the Cross-IT equipment & stock calculations step, by the `Resources_Used_VM` ratio.
 
-## Cross-IT equipment calculation for Instances
+## Electricity consumption calculation
 
 The only part of the calculation that will differ from the basis is the [Customer Servers](/environmental-footprint/additional-content/environmental-footprint-calculator/#customer-servers) section.
 
@@ -95,7 +95,7 @@ The allocation of the hypervisor resources for this particular Instance is calcu
 We multiply the resource allocation by the Instance's lifespan ratio and the hypervisor's manufacturing impact to obtain the manufacturing impact allocated to the Instance:
 
 ```
-(100 hours / 52,680 hours) × 100 kgCO2e × 0.425 = 0.080 kgCO2eq
+(100 hours / 52,680 hours) * 100 kgCO2e * 0.425 = 0.080 kgCO2eq
 ```