Support for zone-redundant storage (ZRS) managed disks

[ramankumarlive]

Resource Provider
Microsoft.Compute/DiskRP
Microsoft.Compute/CRP

Description of Feature or Work Requested
ZRS managed disks provides synchronous replication of data across the Zones in a region, enabling disks to tolerate Zonal failures which may occur due to natural disasters or hardware issues. ZRS disks maintain three consistent copies of the data in distinct Availability Zones in a region, making them tolerant to outages. ZRS disks enable customers to maximize their virtual machine availability without the need for application-level replication of data across zones, which is not supported by many legacy applications such as old versions of SQL or industry-specific proprietary software. This means that, if a virtual machine becomes unavailable in an affected Zone, you can continue to work with the ZRS disk by mounting it to a virtual machine in a different zone. You can also use the ZRS option with shared disks to provide improved availability for clustered or distributed applications like SQL FCI, SAP ASCS/SCS or GFS2. ZRS disks is now supported on Premium SSDs and Standard SSDs.

We need the following changes:

1. Update Azure CLI to use the API version 2020-12-01 for virtual machines, virtual machine scale sets and managed disks
2. Update the VM, VMSS and disk commands to accept the two new types of disks: Premium_ZRS and StandardSSD_ZRS
3. Update the VM and disk commands to ensure that ZRS disks cannot be pinned with a zone.
4. Update the VM commands to ensure that a ZRS disk can be attached to a zonal VM.
5. Update the disk commands to ensure that customers can change the sku (StorageType) of a ZRS disk to other types such as Premium_LRS, StandardSSD_LRS and vice versa.
6. Update the disk commands to ensure that Premium_ZRS and StandardSSD_ZRS works for shared disks.

Minimum API Version Required
2020-12-01

Swagger Link
DiskRP: Azure/azure-rest-api-specs@d4242d0
CRP: Azure/azure-rest-api-specs#12958 (review)

Target Date
April 16th 2021

[yungezz]

put in S185 for now

[qwordy]

Raman Kumar (@ramankumarlive)
1, 2, 5 are finished.
4, 6, I need to test.
3, do you expect me to add a validation rule in Azure CLI?

In which region can I use ZRS disk?

[ramankumarlive]

Feiyue Yu (@qwordy)
#3 - good to add validation to fail fast but not a P0 requirement
You can use ZRS disks in East US EUAP region. Let me tell you how to enable the feature for your subscription.