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IBM Spectrum Scale

Deployment Prerequisities

  • Spectrum-Scale - Ensure the Spectrum Scale client (NSD client) is installed and part of a Spectrum Scale cluster.
  • NFS - Ensure hosts support mounting NFS file systems.

Ubiquity Dynamic Provisioner

Volume Creation usage

Volumes are dynamically provisioned by the dynamic provisioner. In order to have this functionality we need to create a storageClass that refers to the provisioner. Afterwards, we need to create PersistentVolumeClaims (PVC) that will be handled by the provisioner. The provisioner will create volumes and bind them to the PVC.

Available Storage Classes

These storage classes are described in the YAML files in deploy folder:

  • spectrum-scale-fileset - described in deploy/storage_class_fileset.yml, it allows the dynamic provisioner to create volumes out of Spectrum Scale filesets.

  • spectrum-scale-fileset-lightweight - described in deploy/storage_class_lightweight.yml, it allows the dynamic provisioner to create volumes out of sub-directories of filesets.

  • spectrum-scale-fileset-nfs - described in deploy/storage_class_fileset_nfs.yml, it allows the dynamic provisioner to create volumes out of Spectrum Scale filesets based on NFS.

Usage example:

In order to test the dynamic provisioner create a storage class:

kubectl create -f deploy/storage_class_fileset.yml

The class is referring to ubiquity/flex as its provisioner. So this provisioner should be up and running in order to be able to dynamically create volumes. filesystem parameter refers to the name of the filesystem to be used by the dynamic provisioner to create the volume. backend parameter is used to select the backend used by the system. The type parameter is used to specify the type of volumes to be provisioned by spectrum-scale backend.

The following snippet shows a sample persistent volume claim for using dynamic provisioning:

kubectl create -f deploy/pvc_fileset.yml

The claim is referring to spectrum-scale-fileset as the storage class to be used. A persistent volume should be dynamically created and bound to the claim.

Ubiquity FlexVolume CLI

Configuring Ubiquity Docker Plugin with Ubiquity and Spectrum Scale

In case you need Spectrum Scale with NFS connectivity add this 2 lines into the ubiquity-client.conf file.

[SpectrumNfsRemoteConfig]
ClientConfig = "192.168.1.0/24(Access_Type=RW,Protocols=3:4,Transports=TCP:UDP)"

Where the ClientConfig contains the CIDR that the node where the volume will be mounted belongs to.