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Volume Limits support

Volume Limits is supported with this driver.

CSI driver would leverage IMDS to query current VM sku on the agent node, if IMDS is available, it would return max data disk num of current VM sku, if IMDS is not available, it would use default max data disk num 16 which may be incorrect for some VM SKUs.

Get max_volumes_per_node

  • following example shows max_volumes_per_node is 8 on node aks-nodepool1-75219208-0
# kubectl get CSINode node-name -o yaml
apiVersion: storage.k8s.io/v1
kind: CSINode
metadata:
...
spec:
  drivers:
  - allocatable:
      count: 8
    name: disk.csi.azure.com
    nodeID: aks-nodepool1-75219208-0
    topologyKeys:
    - topology.disk.csi.azure.com/zone

Troubleshooting max_volumes_per_node setting

  • Get csi-azuredisk-node logs on the node
kubectl logs csi-azuredisk-node-s2zrz -n kube-system -c azuredisk
  • Check /csi.v1.Node/NodeGetInfo logs
I0130 02:59:33.996338       1 utils.go:77] GRPC call: /csi.v1.Node/NodeGetInfo
I0130 02:59:33.996366       1 utils.go:78] GRPC request: {}
I0130 02:59:33.996432       1 azure_zones.go:165] Availability zone is not enabled for the node, falling back to fault domain
I0130 02:59:33.996445       1 nodeserver.go:350] NodeGetInfo, nodeName: aks-agentpool-31822535-vmss000006, failureDomain: 0
I0130 02:59:33.996458       1 nodeserver.go:408] got a matching size in getMaxDataDiskCount, VM Size: STANDARD_D4S_V3, MaxDataDiskCount: 8
I0130 02:59:33.996468       1 utils.go:84] GRPC response: {"accessible_topology":{"segments":{"topology.disk.csi.azure.com/zone":""}},"max_volumes_per_node":8,"node_id":"aks-agentpool-31822535-vmss000006"}