Error while creating Vm with Shared Disk

Question

Dear All

I am trying to create a Vm with shared disks but I get the following error. Could someone please shed some light?

/providers/Microsoft.Compute/disks/VM1_DataDisk_0' with maxShares 2 supports only Disk CachingType 'None'."}]}

Appreciate your response.

Thank you

Answer 1

Hello @KaizadAnklesaria-2991 ,

Basically , Shared disks can only be attached with Host Caching "None". By default, Premium SSD data disk will have the "Read-Only" host caching set.   

In order to attach the shared disks for the VM, you will need to do the following:

1. Navigate to the Disks
2. Click on Attach existing disks
3. Select the host caching to "NONE"
4. Continue to select your existing shared disk from the list.
5. Save it.

https://learn.microsoft.com/en-us/azure/virtual-machines/disks-shared
https://learn.microsoft.com/en-us/azure/virtual-machines/disks-shared-enable?tabs=azure-portal

While creating, if you see the failed deployment you can redeploy and before redeploying click on Edit
If you see the parameter Caching - it will show as "ReadOnly" - Change it to "None"

[{"lun":0,"createOption":"attach","deleteOption":"Detach","caching":"None","writeAcceleratorEnabled":false,"id":"/subscriptions/subid/resourceGroups/SHAREDDISK/providers/Microsoft.Compute/disks/shareddisk","name":null,"storageAccountType":null,"diskSizeGB":null,"diskEncryptionSet":null}]

Answer 2

Hello,

First you need to select Host Caching as "None" and then select the shared disk.

Answer 3

Hi @KaizadAnklesaria-2991

Thanks for reaching out to Microsoft Q&A Forum .

I would like to explain the error and workaround as follows :

Hope this was helpful

Thanks,
Pradeep

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Answer 4

Dear All

Many thanks for taking the time to respond and apologies for the delayed response. I was actually waiting for an email notification that someone has posted an answer for my question. When I logged into the community forum I saw that my post had an answer.

Although the solution provided by @shiva patpi did work, I have a question.

When I try to create my VM I am unable to select Host Caching as 'None' as the default option is 'Read Only' and greyed out. I have attached a screenshot for your reference.

Answer 5

Thanks. This solution worked to attach the disk.

After successful attachment, On the shared drive, When we place a file from one VM same file is not shown in another VM.

Do we need to do any additional steps or permissions? How to show the same files from both the machine on the shared drive?