Azure Disk Storage
- Block-level storage volumes for Azure Virtual Machines
- Disk Storage is a managed disk that is designed for 99.999% availability.
- You can create 50,000 VM disks for each region.
- Different types of storage options: Standard HDD, Standard SSD, Premium SSD, and Ultra Disk volumes up to 64 TiB.
- OS disk has a maximum capacity of 2,048 GiB
- The maximum size of the data disk is 32,767 GiB.
- Managed disks are integrated with the availability sets to ensure that the VM disks are separated from each other in an availability set to prevent a single failure point.
- You can assign specific permissions for a managed disk to one or more users using Azure RBAC.
- You can use the temporary disk to store data such as page or swap files
- Ephemeral OS disks for stateless applications
- Attach a managed disk to multiple virtual machines (VMs) simultaneously using Azure shared disks.
- With snapshots, you can take a back up of your managed disks at any given point in time.
- Standard HDD
- Low cost and suitable for backups.
- Write latencies under 10ms.
- Read latencies under 20ms.
- Standard SSD
- Consistent performance at lower IOPS levels.
- Higher reliability, scalability, and lower latency over HDD.
- Premium SSD
- High-performance and low-latency disk for VMs.
- Consistent IOPS, and throughput.
- Offers disk bursting and can burst their IOPS per disk up to 3,500 and their bandwidth up to 170 Mbps.
- Peak burst limit of 30 mins
- Ultra Disk
- High throughput, high IOPS, and consistent low latency disk storage
- Only supports un-cached reads and un-cached writes
- Doesn’t support disk snapshots, VM images, availability sets, Azure Dedicated Hosts, or Azure disk encryption.
- The integration with Azure Backup or Azure Site Recovery is not supported.
Backup, non-critical, infrequent access
Web servers, and light applications of enterprise
Production and performance sensitive workloads
IO-intensive workloads, top tier databases, and other transaction-heavy workloads
Max disk size
- Server-Side Encryption (SSE) is performed by the storage service.
- Azure Disk Encryption (ADE) can be enabled on the OS and data disks.
- Encrypted using 256-bit AES encryption.
- For standard HDDs, standard SSDs, and premium SSDs: disabling or deleting the key will automatically shut down all the VMs with disks using that key.
- If you disable or delete a key, any virtual machines with ultra disks using the key won’t automatically shut down.
- Once you enable end-to-end encryption, temp disks and ephemeral OS disks are encrypted with platform-managed keys.
- Managed disk size is billed on the provisioned size.
- Snapshots are charged based on the size used.
- Outbound data transfers incur billing for bandwidth usage.
- You are charged for the number of transactions that you perform on a managed disk (the number of read and write data operations performed).
Azure Blob vs Disk vs File Storage:
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