Configuring SFS Turbo Mount Options

This section describes how to configure SFS Turbo mount options. For SFS Turbo, you can only set mount options in a PV and bind the PV by creating a PVC.

Prerequisites

The CCE Container Storage (Everest) add-on version must be 1.2.8 or later. This add-on identifies the mount options and transfers them to the underlying storage resources. The parameter settings take effect only if the underlying storage resources support the specified options.

Constraints

Mount options cannot be configured for secure containers.
Due to the restrictions of the NFS protocol, if an SFS volume is mounted to a node for multiple times, link-related mounting parameters (such as timeo) take effect only when the SFS volume is mounted for the first time. For example, if an SFS volume is mounted to multiple pods running on a node, the values of the mounting parameters configured later will not overwrite the existing parameter values.

SFS Turbo Mount Options

The Everest add-on in CCE presets the options described in Table 1 for mounting SFS Turbo volumes.

**Table 1** SFS Turbo mount options
Parameter	Value	Description
vers	3	File system version. Currently, only NFSv3 is supported. Value: 3
nolock	Leave it blank.	Whether to lock files on the server using the NLM protocol. If nolock is selected, the lock is valid for applications on one host. For applications on another host, the lock is invalid.
timeo	600	Waiting time before the NFS client retransmits a request. The unit is 0.1 seconds. Recommended value: 600
hard/soft	Leave it blank.	Mount mode. hard: If the NFS request times out, the client keeps resending the request until the request is successful. soft: If the NFS request times out, the client returns an error to the invoking program. The default value is hard.

Configuring Mount Options in a PV

You can use the mountOptions field to configure mount options in a PV. The options you can configure in mountOptions are listed in SFS Turbo Mount Options.

Use kubectl to connect to the cluster. For details, see Connecting to a Cluster Using kubectl.

Set mount options in a PV. Example:

apiVersion: v1
kind: PersistentVolume
metadata:
  annotations:
    pv.kubernetes.io/provisioned-by: everest-csi-provisioner
  name: pv-sfsturbo    # PV name.
spec:
  accessModes:
  - ReadWriteMany      # Access mode. The value must be ReadWriteMany for SFS Turbo.
  capacity:
    storage: 500Gi       # SFS Turbo volume capacity.
  csi:
    driver: sfsturbo.csi.everest.io    # Dependent storage driver for the mounting.
    fsType: nfs
    volumeHandle: {your_volume_id}   # SFS Turbo volume ID
    volumeAttributes:
      everest.io/share-export-location: {your_location}   # Shared path of the SFS Turbo volume.
      everest.io/enterprise-project-id: {your_project_id}  # Project ID of the SFS Turbo volume.
      storage.kubernetes.io/csiProvisionerIdentity: everest-csi-provisioner
  persistentVolumeReclaimPolicy: Retain    # Reclaim policy.
  storageClassName: csi-sfsturbo           # SFS Turbo storage class name.
  mountOptions:                            # Mount options.
  - vers=3
  - nolock
  - timeo=600
  - hard

After a PV is created, you can create a PVC and bind it to the PV, and then mount the PV to the container in the workload. For details, see Using an Existing SFS Turbo File System Through a Static PV.
Check whether the mount options take effect.
In this example, the PVC is mounted to the workload that uses the nginx:latest image. You can run the mount -l command to check whether the mount options take effect.
1. View the pod to which the SFS Turbo volume has been mounted. In this example, the workload name is web-sfsturbo.
```
kubectl get pod | grep web-sfsturbo
```
  Command output:
```
web-sfsturbo-***   1/1     Running   0             23m
```
2. Run the following command to check the mount options (web-sfsturbo-*** is an example pod):
```
kubectl exec -it web-sfsturbo-*** -- mount -l | grep nfs
```
  If the mounting information in the command output is consistent with the configured mount options, the mount options have been configured.
```
<Your mount path> on /data type nfs (rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,nolock,noresvport,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=**.**.**.**,mountvers=3,mountport=20048,mountproto=tcp,local_lock=all,addr=**.**.**.**)
```