vSphere

TL;DR Converting disks is not the finish line. Your real goal is a new steady state: no unmanaged disks no lingering storage account VHD costs guardrails that prevent reintroduction Cleanup is measurable FinOps value: remove unattached disks and old VHD blobs after your validation period. Governance is your long-term win: use Azure Policy to audit

TL;DR Converting a VM to managed disks is usually operationally straightforward: deallocate, convert, start, validate. The real work is coordination: availability set batching maintenance windows IP address behavior validation and rollback plan Expect a possible post-migration background-copy window where reads can be slower. Do not skip cleanup: original VHD blobs and storage accounts can keep

TL;DR If any Azure IaaS VM in your estate still uses unmanaged disks, it is on a hard clock: after March 31, 2026 those VMs can’t be started, and running or allocated ones are stopped and deallocated. Your fastest reality check is the Azure Portal VM list: add the Uses managed disks column/filter and set