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Intro

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Matthew Wong
2016-08-19 17:59:45 -04:00
parent 91d0988afb
commit 0c5b27f2e6
1 changed files with 9 additions and 7 deletions
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docs/user-guide/persistent-volumes/index.md
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@@ -20,11 +20,13 @@ A `PersistentVolume` (PV) is a piece of networked storage in the cluster that ha
A `PersistentVolumeClaim` (PVC) is a request for storage by a user. It is similar to a pod. Pods consume node resources and PVCs consume PV resources. Pods can request specific levels of resources (CPU and Memory). Claims can request specific size and access modes (e.g, can be mounted once read/write or many times read-only). A `PersistentVolumeClaim` (PVC) is a request for storage by a user. It is similar to a pod. Pods consume node resources and PVCs consume PV resources. Pods can request specific levels of resources (CPU and Memory). Claims can request specific size and access modes (e.g, can be mounted once read/write or many times read-only).
Administrators often need to offer and provision a variety of While `PersistentVolumeClaims` allow a user to consume abstract storage
`PersistentVolumes` that differ in more ways than just size and access modes, resources, it is common that users need `PersistentVolumes` with varying
and users should be able to choose from the offered volumes without having to properties, such as performance, for different problems. Cluster administrators
understand their technical properties. For these needs there is the need to be able to offer a variety of `PersistentVolumes` that differ in more
`StorageClass` resource. ways than just size and access modes, without exposing users to the details of
how those volumes are implemented. For these needs there is the `StorageClass`
resource.
A `StorageClass` provides a way for administrators to describe the "classes" of A `StorageClass` provides a way for administrators to describe the "classes" of
storage they offer. Different classes might map to quality-of-service levels, storage they offer. Different classes might map to quality-of-service levels,
@@ -254,8 +256,8 @@ parameters:
### Provisioner ### Provisioner
Storage classes have a provisioner that determines what volume plugin is used Storage classes have a provisioner that determines what volume plugin is used
for provisioning PVs. This field must be specified. The available provisioner for provisioning PVs. This field must be specified. During beta, the available
types are `kubernetes.io/aws-ebs` and `kubernetes.io/gce-pd`. provisioner types are `kubernetes.io/aws-ebs` and `kubernetes.io/gce-pd`.
### Parameters ### Parameters
Storage classes have parameters that describe volumes belonging to the storage Storage classes have parameters that describe volumes belonging to the storage