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Add a note about filesystem overhead for PVC size request 

Though this is not explicitly stated, it seems acceptable that
once a provider builds a filesystem on top of a block device,
some writeable capacity is lost:
https://github.com/container-storage-interface/spec/issues/338

Signed-off-by: Alex Kalenyuk <akalenyu@redhat.com>
pull/50146/head
Alex Kalenyuk 2025-03-19 11:32:31 +02:00
parent df43e5cc81
commit 375896f207
1 changed files with 5 additions and 0 deletions
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5
content/en/docs/concepts/storage/persistent-volumes.md
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@ -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