When the PoC for IPI installations was created for Azure Stack Hub, the Azure Stack environment that we were using did not support anything other than Standard_LRS for the disk type. This has since been resolved and the installer should not pin the disk type to Standard_LRS.
confirmed Master and worker nodes are being provisioned with different disk types in the WWT ASH environment and this also matches what is present in the terraform debuging output. "osDisk": { "caching": "None", "createOption": "FromImage", "diskSizeGb": 1023, "encryptionSettings": null, "image": null, "managedDisk": { "id": "/subscriptions/de7e09c3-b59a-4c7d-9c77-439c11b92879/resourceGroups/mgahagan411ipi220315-zldns-rg/providers/Microsoft.Compute/disks/mgahagan411ipi220315-zldns-master-2_OSDisk", "resourceGroup": "mgahagan411ipi220315-zldns-rg", "storageAccountType": "Premium_LRS" },
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Important: OpenShift Container Platform 4.11.0 bug fix and security update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2022:5069