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Add a note about filesystem overhead for PVC size request #50146

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Add a note about filesystem overhead for PVC size request #50146

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5 changes: 5 additions & 0 deletions content/en/docs/concepts/storage/persistent-volumes.md
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Expand Up @@ -830,6 +830,11 @@ the request is for storage. The same
[resource model](https://git.k8s.io/design-proposals-archive/scheduling/resources.md)
applies to both volumes and claims.

{{< note >}}
For `Filesystem` volumes, the storage request refers to the "outer" volume size (i.e. the allocated size from the storage backend).
This means that the writeable size may be slightly lower for providers that build a filesystem on top of a block device, due to filesystem overhead. This is especially visible with XFS, where many metadata features are enabled by default.
{{< /note >}}

### Selector

Claims can specify a
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