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moving use cases up

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KilimAnnejaro
2020-10-27 20:50:49 -05:00
parent 7f5f3cb00e
commit 6aee0699e2
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content/en/docs/concepts/storage/volume-snapshots.md
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@@ -31,6 +31,8 @@ A `VolumeSnapshot` is a request for snapshot of a volume by a user. It is simila
`VolumeSnapshotClass` allows you to specify different attributes belonging to a `VolumeSnapshot`. These attributes may differ among snapshots taken from the same volume on the storage system and therefore cannot be expressed by using the same `StorageClass` of a `PersistentVolumeClaim`.
Volume snapshots provide Kubernetes users with a standardized way to copy a volume's contents at a particular point in time without creating an entirely new volume. This functionality enables, for example, database administrators to backup databases before performing edit or delete modifications.
Users need to be aware of the following when using this feature:
* API Objects `VolumeSnapshot`, `VolumeSnapshotContent`, and `VolumeSnapshotClass` are {{< glossary_tooltip term_id="CustomResourceDefinition" text="CRDs" >}}, not part of the core API.
@@ -39,12 +41,6 @@ Users need to be aware of the following when using this feature:
* 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 the csi-snapshotter. See [CSI Driver documentation](https://kubernetes-csi.github.io/docs/) for details.
* The CRDs and snapshot controller installations are the responsibility of the Kubernetes distribution.
### Use Cases for This Feature
Volume snapshots provide Kubernetes users with a standardized way to copy a volume's contents at a particular point in time without creating an entirely new volume. This functionality enables, for example, database administrators to backup databases before performing edit or delete modifications.
For more information, see [Kubernetes 1.17 Feature: Kubernetes Volume Snapshot Moves to Beta](https://kubernetes.io/blog/2019/12/09/kubernetes-1-17-feature-cis-volume-snapshot-beta/).
## Lifecycle of a volume snapshot and volume snapshot content
`VolumeSnapshotContents` are resources in the cluster. `VolumeSnapshots` are requests for those resources. The interaction between `VolumeSnapshotContents` and `VolumeSnapshots` follow this lifecycle: