In this case, the Standard_DS3_v2 is the smallest size in the DSv2 series that you can use with this image.įor example, if you want to opt for Temp disk placement: Standard Ubuntu server image from marketplace is about 30 GiB. The Standard_DS3_v2 has a cache size of 127 GiB, which is large enough.
#Ephemeral definition on technical term windows#
The image OS disk’s size should be less than or equal to the temp/cache size of the VM size chosen.įor example, if you want to opt for OS cache placement: Standard Windows Server images from the marketplace are about 127 GiB, which means that you need a VM size that has a cache equal to or larger than 127 GiB. You can choose to deploy Ephemeral OS Disk on VM cache or VM temp disk. With this feature, when a Windows VM is provisioned, we configure the pagefile to be located on the OS Disk. Placement options for Ephemeral OS disksĮphemeral OS disk can be stored either on VM's OS cache disk or VM's temp/resource disk.ĭiffDiskPlacement is the new property that can be used to specify where you want to place the Ephemeral OS disk. However, many OS disks are partitioned with master boot record (MBR) by default and because of this are limited to 2 TiB. * 4 TiB is the maximum supported OS disk size for managed (persistent) disks. 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. VM sizes that support Premium storage such as DSv1, DSv2, DSv3, Esv3, Fs, FsV2, GS, M, Mdsv2, Bs, Dav4, Eav4 For the cache or temp size in GiB, see DS, ES, M, FS, and GS Key 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 VMs and scale set instances to the original boot state.Supported by Marketplace, custom images, and by Azure Compute Gallery (formerly known as Shared Image Gallery).With Ephemeral OS disk, 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. Applies to: ✔️ Linux VMs ✔️ Windows VMs ✔️ Flexible scale sets ✔️ Uniform scale setsĮphemeral OS disks are created on the local virtual machine (VM) storage and not saved to the remote Azure Storage.
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