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Veritas InfoScale™ for Kubernetes Environments 8.0.220 - Linux

Last Published: 2023-10-16

Product(s): InfoScale & Storage Foundation (8.0.220)

Platform: Linux

Dynamic provisioning

You can dynamically provision a volume over shared storage (CVM) and shared nothing (FSS) storage. In dynamic provisioning, you must create a Storage Class that define the storage provisioner and the required parameters in the storage class yaml file and create the Persistent Volume Claim. The Pod references the Storage Class through an existing Persistent Volume Claim and dynamically allocates storage for the requesting Pod.

While allocating storage to pods dynamically, you can reclaim the storage when the previously provisioned storage is available for other applications to use. You can resize an existing volume using the Persistent Volume Claim (PVC) object.

Perform the following steps for allocating storage dynamically to container workloads:

Create a Storage Class using a yaml file.
```
oc create -f csi-infoscale-sc.yaml
```

Define the Persistent Volume Claim and specify the appropriate Storage Class, access mode, and the required storage size.

csi-dynamic-pvc.yaml
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: csi-infoscale-pvc
spec:
  storageClassName: csi-infoscale-sc
  accessModes:
    - ReadWriteMany

  resources:
    requests:
      storage: 5Gi

Create a Persistent Volume Claim using the yaml.
```
oc create -f csi-dynamic-pvc.yaml
```

Update csi-mysql-app.yaml and specify the Persistent Volume Claim name.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql-deployment
  labels:
    app: mysql
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
        - name: mysql
          image: mysql:latest
          ports:
            - containerPort: 3306
          volumeMounts:
            - mountPath: "/var/lib/mysql"
              name: mysql-data
          env:
            - name: MYSQL_ROOT_PASSWORD
              value: root123
      volumes:
        - name: mysql-data
          persistentVolumeClaim:
            claimName: csi-infoscale-pvc

Create the application pod.
```
oc create -f csi-mysql-app.yaml
```
After the pod is created, start using the InfoScale PVC as a Persistent Storage.

Enabling raw block volume support with dynamic provisioning

Ensure that volumeMode is Block in as under in csi-dynamic-block-pvc.yaml .

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: csi-infoscale-block-pvc
spec:
  volumeMode: Block
  storageClassName: csi-infoscale-sc
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 4Gi

Run the following command to set Block as the VolumeMode oc apply -f csi-dynamic-block-pvc.yaml

Ensure that you resize the file system and drain I/O's from the file system under snapshots and clones for crash consistent snapshots.

After enabling raw block volume support, applications can write to the block device or create filesystem at the block level. Online resizing of block without detaching the block storage is supported. However, Resizing can be to a higher value only.