![]() You can store ephemeral OS disks on the virtual machine's OS cache disk or temporary storage SSD (also known as resource disk). Maintenance of VM/VMSS using Live Migration ![]() Supported during VM creation and after VM is stop-deallocatedĭata on the OS disk is deleted, OS is reprovisionedįor Windows, page file is stored on the resource diskįor Windows, page file is stored on the OS disk (for both OS cache placement and Temp disk placement). ![]() VMs and scale set instances can be stop-deallocated and restarted from the stop-deallocated state OS disk data written to OS disk are stored in Azure Storageĭata written to OS disk is stored on local VM storage and isn't persisted to Azure Storage. NOTE: this list is not exhaustive and does not contain all the VM series that support ephemeral OS disks. VM sizes that support Premium storage such as DSv2, DSv3, DSv4, Esv3, Fs, FsV2, GS, M, Mdsv2, Bs, Dav4, Eav4. For the cache or temp size in GiB, see DS, ES, M, FS, and GS The following table remarks the main differences between persistent and ephemeral OS disks:Ĭache size or temp size for the VM size or 2040 GiB, whichever is smaller. Ephemeral OS disks are free you incur no storage cost for OS disks.Lower latency, similar to a temporary disk.Ability to fast reset or reimage virtual machines and scale set instances to the original boot state.Supported by the Azure Marketplace, custom images, and Azure Compute Gallery.Ideal for stateless applications and workloads.The key features of ephemeral disks are the following: With Ephemeral OS disks, you get lower read/write latency to the OS disk and faster VM reimage. Ephemeral OS disks work well for stateless workloads, where applications are tolerant of individual VM failures but are more affected by VM deployment time or reimaging of individual VM instances. For more information on the performance of a managed disk, see Disk allocation and performance. You can use the Bicep modules in this GitHub repository to deploy an AKS cluster and repeat the tests described in this article.Įphemeral OS disks are created on the local virtual machine (VM) storage and not saved to the remote Azure Storage, as when using managed OS disks. You will also get faster cluster operations like scale or upgrade thanks to faster re-imaging and boot times. With ephemeral OS disks, you see lower read/write latency on the OS disk of AKS agent nodes since the disk is locally attached. This article analyzes in-depth the available configuration settings for the ephemeral OS disk in Azure Kubernetes Service (AKS).
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