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README.md

Topology(Availability Zone)

Topology is a GA feature since Kubernetes v1.17, refer to CSI Topology Feature for more details.

Check node topology on the agent node

In below example, there are two nodes with topology label: topology.disk.csi.azure.com/zone=eastus2-1, which means these two nodes are both in zone 1.

$ kubectl get no --show-labels | grep topo
k8s-agentpool-83483713-vmss000000   Ready    agent    62d   v1.16.2   ...topology.disk.csi.azure.com/zone=eastus2-1
k8s-agentpool-83483713-vmss000001   Ready    agent    62d   v1.16.2   ...topology.disk.csi.azure.com/zone=eastus2-1

if node is in non-zone, topology label would be topology.disk.csi.azure.com/zone=

Tips

Use volumeBindingMode: WaitForFirstConsumer in storage class, pods would be scheduled on the agent node first, and then disk PVs would be created with the same zone as the agent node.

ZRS disk support

  • available version: v1.5.0+

ZRS(Premium_ZRS, StandardSSD_ZRS) disk could be scheduled on the zone and non-zone agent node, without the restriction that disk volume should be co-located in the same zone as a given node. ZRS disk is supported only in a few regions, more details about Zone-redundant storage for managed disks.

  • Use following storage class with ZRS disk support
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: managed-csi-zrs
provisioner: disk.csi.azure.com
parameters:
  skuName: StandardSSD_ZRS
reclaimPolicy: Delete
volumeBindingMode: WaitForFirstConsumer

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