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Overview

OKD is capable of provisioning persistent volumes (PVs) using the Container Storage Interface (CSI) driver for IBM Virtual Private Cloud (VPC) Block Storage.

Familiarity with persistent storage and configuring CSI volumes is recommended when working with a CSI Operator and driver.

To create CSI-provisioned PVs that mount to IBM VPC Block storage assets, OKD installs the IBM VPC Block CSI Driver Operator and the IBM VPC Block CSI driver by default in the openshift-cluster-csi-drivers namespace.

  • The IBM VPC Block CSI Driver Operator provides three storage classes named ibmc-vpc-block-10iops-tier (default), ibmc-vpc-block-5iops-tier, and ibmc-vpc-block-custom for different tiers that you can use to create persistent volume claims (PVCs). The IBM VPC Block CSI Driver Operator supports dynamic volume provisioning by allowing storage volumes to be created on demand, eliminating the need for cluster administrators to pre-provision storage.

  • The IBM VPC Block CSI driver enables you to create and mount IBM VPC Block PVs.

About CSI

Storage vendors have traditionally provided storage drivers as part of Kubernetes. With the implementation of the Container Storage Interface (CSI), third-party providers can instead deliver storage plug-ins using a standard interface without ever having to change the core Kubernetes code.

CSI Operators give OKD users storage options, such as volume snapshots, that are not possible with in-tree volume plug-ins.

Additional resources