For an Azure Virtual machine (VM), you can get better performance when you select a larger VM size. With thesupport ofthe newD-series of VM sizes, you can obtain faster processors, a higher memory-to-core ratio, and a solid-state drive (SSD) for the temporary disk with them.
However, sometimes you cannot use the D-series sizes for an Azure VM when creating the VM or resizing the VM. In these article, we introduce the main reasons and the troubleshooting steps for this kind of issue.
1. When creating a VM
If you cannot select the D-series sizes when you creating a VM, it would be caused by the two reasons below:
a. The Tier of the VM is not supported
Virtual machines are available in two tiers – basic and standard. However, only the he standard tier of sizes consists of D series and DS series. (Figure 1& Figure 2)
Figure 1.
Figure 2.
If you create a new Azure VM, please make sure that you choose the Standard tier so that you can select the D-series sizes.
b. The region of the VM is not supported
At present, the D-series sizes are not supported in the Brazil South region. If you choose that region for a D-series VM, you will receive the error “The region you’ve selected doesn’t support the virtual machine size selected in the previous step”. (Figure 3)
Figure 3.
If you create a new VM, you can just select a supported region instead.
2. When resizing the VM
a. The region of the VM is not supported
If the VM is in the Brazil South region, when you try to resize the VM to the size of D-series. You will find that D-series sizes are not available. (Figure 4)
Figure 4.
Figure 5.
In these scenario, you can only create a new VM in a supported region.
(Note: If you capture image or delete the VM and keep the attached disks in the existing VM, you cannot create a new D-series size VM using the existing image as you cannot create a new VM in another region using that image/disk.)
b. The Tier of the VM is not supported
If it is a basic tier VM, when you try to resize the VM, you will find the D-series sizes are not available. (Figure 6)
Figure 6.
In these scenario, you can change the tier to Standard and save the changes. (Figure 7)
Figure 7.
After the VM is updated, you can select the D-series sizes. (Figure 8)
Figure 8.
However, you may find that you still cannot choose the D-series sizes after you change the tier to standard, just like the figure 5. It may be caused by the first VM you created in the cloud service is not a standard tier VM.
In this case, since the region is in a supported region, you can delete the VM and select the “Keep the attached disks” option (Figure 9). Then using that disk to create a new VM with the D-series size you want to configure. (Figure 10 & Figure 11)
Figure 9.
Figure 10.
Figure 11.
Note: With the option “Keep the attached disks”, the attached disks and their VHD files will be kept in the storage account. However, after you create the new VM using that image, the data on the temporary drive D: would be lost. If you have important data on it, please backup before you delete the VM.
More information:
http://azure.microsoft.com/blog/2014/09/22/new-d-series-virtual-machine-sizes/
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