Azure Logical Unit Number(LUN) Value of a disk

_{Thursday, May 23, 2013 12:01 PM}

I need the Logical Unit Number of the azure disks as it is required in almost all the operations on virtual machines disks (update data disk, delete data disk etc..)

https://management.core.windows.net/<subscription-id>/services/hostedservices/<service-name>/deployments/<deployment-name>/roles/<role-name>/DataDisks/<lun>

Where can i get the LUN value?

_{Thursday, May 23, 2013 3:28 PM | 1 vote}

The LUN specifies the slot in which the data drive appears when mounted for usage by the virtual machine.

It has valid LUN values are 0 through 15. On the VM, go to disk management and check the slot number..see image http://www.windowsazure.com/media/itpro/shared/servermanager.png for reference.

_{Friday, May 24, 2013 4:50 AM}

Thanks for the reply. I need some more clarification. I have an azure account, then virtual machines and disks in that account. I want to programatically update those disks and have implemented the UpdateDataDiskApi: http://msdn.microsoft.com/en-us/library/windowsazure/jj157190.aspx

and this requires the lun value in the request uri -

https://management.core.windows.net/<subscription-id>/services/hostedservices/<service-name>/deployments/<deployment-name>/roles/<role-name>/DataDisks/<lun>

So, what i want is the LUN value of the disk in my azure account, Where can i find the LUN value of the disk in my Azure account?

_{Monday, May 27, 2013 6:28 AM}

Hi,

Since the issue is related to Iaas, I have moved this thread to Virtual Machine forums for getting a better support.

Thanks for your understanding.

QinDian Tang
MSDN Community Support | Feedback to us
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_{Tuesday, April 3, 2018 6:19 AM}

Hi,

Apologies for posting in such an old thread.

I just wanted to know if the 'LUN' number affects the functionality of the resources.

Actually i provisioned a SQL Server VM with 192Gb DataDisk attached.

Later on  i attached **3x64 GB (Lun 1, LUN 2, LUN 3)**DataDisks to VM and detached **192Gb (LUN 0)  **disk.

So does it cause any logical/technical issue??? ( I mean is it mandatory to have the LUN started fron 0 itself)??

Thanks in advance.

Ashutosh

_{Monday, September 30, 2019 11:17 PM}

Is there a way to get the LUN from the Python sdk? I.e. I have a DisksOperations object and a Disk object. Can I get the LUN that goes with that Disk?