To ensure resiliency, there's a minimum of three separate zones in all enabled regions. Each zone is made up of one or more datacenters equipped with independent power, cooling, and networking. Availability Zones are unique physical locations within an Azure region. Managed disks support Availability Zones, which is a high-availability offering that protects your applications from datacenter failures. The disks for those VMs won't all be stored in the same stamp, so if one stamp goes down, the other instances of the application continue to run.
For example, let's say you have an application running on five VMs, and the VMs are in an Availability Set. If a stamp fails due to hardware or software failure, only the VM instances with disks on those stamps fail. Disks are automatically placed in different storage scale units (stamps). Managed disks are integrated with availability sets to ensure that the disks of VMs in an availability set are sufficiently isolated from each other to avoid a single point of failure. This feature also further increases the scalability of virtual machine scale sets by allowing you to create up to 1,000 VMs in a virtual machine scale set using a Marketplace image. Using managed disks, you can create up to 50,000 VM disks of a type in a subscription per region, allowing you to create thousands of VMs in a single subscription. Locally-redundant storage (LRS) disks provide at least 99.999999999% (11 9's) of durability over a given year and zone-redundant storage (ZRS) disks provide at least 99.9999999999% (12 9's) of durability over a given year. This architecture has helped Azure consistently deliver enterprise-grade durability for infrastructure as a service (IaaS) disks, with an industry-leading ZERO% annualized failure rate. If one or even two replicas experience issues, the remaining replicas help ensure persistence of your data and high tolerance against failures. Managed disks achieve this by providing you with three replicas of your data, allowing for high durability. Managed disks are designed for 99.999% availability. Let's go over some of the benefits you gain by using managed disks. For information about each individual disk type, see Select a disk type for IaaS VMs.
The available types of disks are ultra disks, premium solid-state drives (SSD), standard SSDs, and standard hard disk drives (HDD). Once you provision the disk, Azure handles the rest.
With managed disks, all you have to do is specify the disk size, the disk type, and provision the disk. Managed disks are like a physical disk in an on-premises server but, virtualized. Applies to: ✔️ Linux VMs ✔️ Windows VMs ✔️ Flexible scale sets ✔️ Uniform scale setsĪzure managed disks are block-level storage volumes that are managed by Azure and used with Azure Virtual Machines.
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