Ive some trouble mounting a single disk Premium_LRS in Azure Kubernetes (AKS).
In the past I used the FileShare to mount the same volume to different pods so they could access the same drive/folder from within different pods. Now, this is very slow to write and do file operations on so I try to switch to a shared mounted disk but I can not access it in the pods. According to the pods events the disk is mounted but I cant access/write to this disk.

My setup:

First Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: xx-import
  namespace: ns
spec:
  replicas: 1
  selector:
    matchLabels:
      app: xx-import
  template:
    metadata:
      labels:
        app: xx-import
    spec:
      containers:
      - name: xx-import
        image: xxx
        imagePullPolicy: Always
        ports:
          - containerPort: 8083
            protocol: TCP
        volumeDevices:
          - name: my-data
            devicePath: /dev/xvda
      volumes:
      - name: my-data
        persistentVolumeClaim:
          claimName: my-pvc

Second Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: yy-import
  namespace: ns
spec:
  replicas: 1
  selector:
    matchLabels:
      app: yy-import
  template:
    metadata:
      labels:
        app: yy-import
    spec:
      containers:
      - name: yy-import
        image: yyy
        imagePullPolicy: Always
        ports:
          - containerPort: 8083
            protocol: TCP
        volumeDevices:
          - name: my-data
            devicePath: /dev/xvda
      volumes:
      - name: my-data
        persistentVolumeClaim:
          claimName: my-pvc

PVC

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  namespace: ns
  name: my-pvc
spec:
  accessModes:
    - ReadWriteMany
  storageClassName: premium_disk_shares
  volumeMode: Block 
  resources:
    requests:
      storage: 20Gi

StorageClass

---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: premium_disk_shares
parameters:
  skuName: Premium_LRS
  maxShares: "2"
  cachingMode: None  #
provisioner: disk.csi.azure.com
reclaimPolicy: Retain
volumeBindingMode: WaitForFirstConsumer
allowVolumeExpansion: true

When I apply this, i get an ok message for both pods:

SuccessfulMountVolume
Normal
xx-import-558b79994c-m28vg
Pod
MapVolume.MapPodDevice succeeded for volume "pvc-001a4e22-41fb-414e-9e03-e0f561b583b6" globalMapPath "/var/lib/kubelet/plugins/kubernetes.io/csi/volumeDevices/pvc-001a4e22-41fb-414e-9e03-e0f561b583b6/dev"
12s
SuccessfulMountVolume
Normal
xx-import-558b79994c-m28vg
Pod
MapVolume.MapPodDevice succeeded for volume "pvc-001a4e22-41fb-414e-9e03-e0f561b583b6" volumeMapPath "/var/lib/kubelet/pods/de7bac8d-1585-4e6f-8f23-77ca2a56fb77/volumeDevices/kubernetes.io~csi"

But how can I now write to the disk so I see the files from within pod xx inside pod yy and vice versa? Is this even possible with an SSD drive?

I already checked: https://github.com/kubernetes-sigs/azuredisk-csi-driver/tree/master/deploy/example/sharedisk

Thanks a lot for your help!