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Node Expansion

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

Prepare a new storage node

Add the node into the Kubernetes cluster, or select a Kubernetes node. The node should have all the required items described in Prerequisites.

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

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

After the new node is already added into the Kubernetes cluster, make sure the following HwameiStor pods are already running on this node.

$ kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master-1 Ready master 96d v1.24.3-2+63243a96d1c393
k8s-worker-1 Ready worker 96h v1.24.3-2+63243a96d1c393
k8s-worker-2 Ready worker 96h v1.24.3-2+63243a96d1c393
k8s-worker-3 Ready worker 96d v1.24.3-2+63243a96d1c393
k8s-worker-4 Ready worker 1h v1.24.3-2+63243a96d1c393

$ kubectl -n hwameistor get pod -o wide | grep k8s-worker-4
hwameistor-local-disk-manager-c86g5 2/2 Running 0 19h 10.6.182.105 k8s-worker-4 <none> <none>
hwameistor-local-storage-s4zbw 2/2 Running 0 19h 192.168.140.82 k8s-worker-4 <none> <none>

# check if LocalStorageNode exists
$ kubectl get localstoragenode k8s-worker-4
NAME IP ZONE REGION STATUS AGE
k8s-worker-4 10.6.182.103 default default Ready 8d

Add the storage node into HwameiStor

Construct the storage pool of the node by adding a LocalStorageClaim CR as below:

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

Post check

Finally, check if the node has constructed the storage pool 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
freeCapacityBytes: 214744170496
freeVolumeCount: 1000
name: LocalStorage_PoolSSD
totalCapacityBytes: 214744170496
totalVolumeCount: 1000
type: REGULAR
usedCapacityBytes: 0
usedVolumeCount: 0
volumeCapacityBytesLimit: 214744170496
volumes:
state: Ready