Microsoft Azure recently announced the support for large disks up to 4 TB. Now Azure Site Recovery supports protecting on-premises VMs and physical servers with disks up to 4095 GB in size to Azure. Many customers use disks with more than 1 TB in capacity for various reasons. A good example would be SQL databases and file servers. The availability of large disks in Azure allows you to leverage ASR as a DR solution for your datacenter infrastructure.
Large disks in Azure are available both in standard and premium tiers. Standard disks offer two sizes S40 (2TB) and S50 (4TB) for both managed and unmanaged disks. If you have IO intensive workloads that require premium storage you can use P40 (2TB) and P50 (4TB) for both managed and unmanaged disks.
Pre-requisites for protecting VMs with large disks in ASR
You need to make sure that your on-premises ASR infrastructure components are up-to-date before you you start protecting VMs and/or physical servers with disks greater than 1 TB in size.
|VMware/Physical Servers||Install the latest update on the Configuration server, additional process servers, additional master target servers and agents.|
|SCVMM managed Hyper-V environments||Install the latest Microsoft Azure Site Recovery Provider update on the on-premises VMM server.|
|Standalone Hyper-V servers not managed by SCVMM||Install the latest Microsoft Azure Site Recovery Provider on each Hyper-V server that is registered with Azure Site Recovery.|
Note that protecting Azure VMs with large disks is not a currently supported scenario.