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Disk Expansion

A storage system is usually expected to expand its capacity by adding a new disk into a storage node. In HwameiStor, it can be done with the following steps.

Prepare a new storage disk​

Select a storage node from the HwameiStor system, and add a new disk into it.

For example, the storage node and new disk information are as follows:

  • name: k8s-worker-4
  • devPath: /dev/sdc
  • diskType: SSD

After the new disk is added into the storage node k8s-worker-4, you can check the disk status as below.

  1. Check if the new disk is added into the node successfully

    ssh root@k8s-worker-4
    lsblk | grep sdc

    The output may look like:

    sdc        8:32     0     20G  1 disk

  2. Check if the LocalDisk CR already exists for the new disk and the status is "Unclaimed"

    kubectl get localdisk | grep k8s-worker-4 | grep sdc

    The output may look like:

    k8s-worker-4-sdc   k8s-worker-4       Available

Add the new disk into the node's storage pool​

The new disk should be added into the existing SSD storage pool of the node. If the storage pool doesn't exist, it will be constructed automatically and the new disk should be added into it.

$ kubectl apply -f - <<EOF
apiVersion: hwameistor.io/v1alpha1
kind: LocalDiskClaim
metadata:
  name: k8s-worker-4-expand
spec:
  nodeName: k8s-worker-4
  owner: local-storage
  description:
    diskType: SSD
EOF

Post check​

Finally, check if the new disk has been added into the node's storage pool successfully by checking the LocalStorageNode CR:

kubectl get localstoragenode k8s-worker-4

The output may look like:

apiVersion: hwameistor.io/v1alpha1
kind: LocalStorageNode
metadata:
  name: k8s-worker-4
spec:
  hostname: k8s-worker-4
  storageIP: 10.6.182.103
  topogoly:
    region: default
    zone: default
status:
  pools:
    LocalStorage_PoolSSD:
      class: SSD
      disks:
      - capacityBytes: 214744170496
        devPath: /dev/sdb
        state: InUse
        type: SSD
      - capacityBytes: 214744170496
        devPath: /dev/sdc
        state: InUse
        type: SSD
      freeCapacityBytes: 429488340992
      freeVolumeCount: 1000
      name: LocalStorage_PoolSSD
      totalCapacityBytes: 429488340992
      totalVolumeCount: 1000
      type: REGULAR
      usedCapacityBytes: 0
      usedVolumeCount: 0
      volumeCapacityBytesLimit: 429488340992
      volumes:
  state: Ready