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Specify rsize and wsize mount parameters for SC and static PV of NFS storage

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Byadmin
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Problem Description

  • Due to NFS's automatic negotiation of block size, the read and write block sizes of NFS will tend to increase (NFS storage memory/4G) * 1024K, with a maximum of 1M.
  • If users are in a business scenario involving frequent small block writes, they can achieve high performance for such writes by modifying the mount parameters rsize and wsize. However, the current interface does not provide customization of mount parameters, and users need to create them manually via a YAML file.

Alert Information

None

Effective Troubleshooting Steps

None

Root Cause

None

Solution

  • The maximum values for rsize and wsize are 1048576 (1M). Users can adjust these values based on the size of the files they are writing. Below are the configurations for SC and PV.

  • SC YAML example

    apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  annotations:
    ske-com/alias: ""
  name: rwsize-sc
mountOptions:
- rsize=4096
- wsize=4096
parameters:
  csi.ske.com/type: std-nfs
  nfs.csi.ske.com/server: 10.131.xxx.143
  nfs.csi.ske.com/share: /home/data
provisioner: nfs.csi.ske.com
reclaimPolicy: Delete
volumeBindingMode: WaitForFirstConsumer

  • PV YAML example

    apiVersion: v1
kind: PersistentVolume
metadata:
  name: rwsize-static-pv
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Delete
  mountOptions:
  - rsize=4096
  - wsize=4096
  csi:
    driver: nfs.csi.ske.com
    volumeHandle: nfs-server.default.svc.cluster.local/share##
    volumeAttributes:
      csi.ske.com/type: std-nfs
      nfs.csi.ske.com/server: 10.131.xxx.143
      nfs.csi.ske.com/share: /home/data
      nfs.csi.ske.com/subdir: "123"

Impact Scope

  • Affects the NFS storage write rate and write frequency. Typically, large blocks are suitable for large file writes, while small blocks are suitable for frequent writes of small files.

Is it a Temporary Solution?

Yes

Suggestions and Summary

None

Original Link

https://support.sangfor.com.cn/cases/list?product_id=37&type=1&category_id=31111&isOpen=true