July 2018
Intermediate to advanced
504 pages
11h 34m
English
Content preview from Learn OpenShift
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Persistent Volume Claims
As I mentioned previously, OpenShift users can request storage resources for their applications by means of PVCs that are defined by a PersistentVolumeClaim OpenShift API object. PVC represents a request made by an end user (usually developers). PVC consumes PV resources.
A PVC contains some important information regarding resources that are requested by applications/users:
- Size needed
- Access mode
There are several access modes that can be used in the OpenShift infrastructure:
|
Mode |
Description |
Examples |
|
ReadOnlyMany |
The volume can be mounted read-only by many nodes. |
NFS in RO mode |
|
ReadWriteOnce |
The volume can be mounted as read-write by a single node. |
iSCSI-based xfs, and so on |
|
ReadWriteMany ... |