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Add clarifications for volume snapshots #10296

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Sep 20, 2018
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Add clarifications for volume snapshots #10296

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7 changes: 7 additions & 0 deletions content/en/docs/concepts/storage/volume-snapshots.md
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Expand Up @@ -32,6 +32,13 @@ need to be able to offer a variety of `VolumeSnapshotContents` without exposing
users to the details of how those volume snapshots should be provisioned. For these needs
there is the `VolumeSnapshotClass` resource.

Users need to be aware of the following when using this feature:

* API Objects `VolumeSnapshot`, `VolumeSnapshotContent`, and `VolumeSnapshotClass` are CRDs, not part of the core API.
* `VolumeSnapshot` support is only available for CSI drivers.
* As part of the deployment process, the Kubernetes team provides a sidecar helper container for the snapshot controller called `external-snapshotter`. It watches `VolumeSnapshot` objects and triggers `CreateSnapshot` and `DeleteSnapshot` operations against a CSI endpoint.
* CSI drivers may or may not have implemented the volume snapshot functionality. The CSI drivers that have provided support for volume snapshot will likely use `external-snapshotter`.
* The CSI drivers that support volume snapshot will automatically install CRDs defined for the volume snapshots.

## Lifecycle of a volume snapshot and volume snapshot content

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