VM storage disks - az vm disk

Manage the managed data disks attached to a VM.

Just like any other computer, virtual machines in Azure use disks as a place to store an operating system, applications, and data. All Azure virtual machines have at least two disks - a Linux operating system disk (in the case of a Linux VM) and a temporary disk. The operating system disk is created from an image, and both the operating system disk and the image are actually virtual hard disks (VHDs) stored in an Azure storage account. Virtual machines also can have one or more data disks, that are also stored as VHDs.

                        Operating System Disk
                        Every virtual machine has one attached operating system disk. It's registered as a SATA drive and is labeled /dev/sda by default. This disk has a maximum capacity of 1023 gigabytes (GB).

                        Temporary disk
                        The temporary disk is automatically created for you. On Linux virtual machines, the disk is typically /dev/sdb and is formatted and mounted to /mnt/resource by the Azure Linux Agent. The size of the temporary disk varies, based on the size of the virtual machine.

                        Data disk
                        A data disk is a VHD that's attached to a virtual machine to store application data, or other data you need to keep. Data disks are registered as SCSI drives and are labeled with a letter that you choose. Each data disk has a maximum capacity of 1023 GB. The size of the virtual machine determines how many data disks you can attach to it and the type of storage you can use to host the disks.

Commands

az vm disk attach Attach a managed disk.
az vm disk detach

az vm disk attach

Attach a persistent disk to your VM so that you can preserve your data, even if your VM is reprovisioned due to maintenance or resizing.

az vm disk attach --disk
--resource-group
--vm-name
[--caching {None, ReadOnly, ReadWrite}]
[--lun]
[--new]
[--size-gb]
[--sku {Premium_LRS, Standard_LRS}]

Examples

Attach a new default sized (1023 GiB) data disk to a VM.

az vm disk attach -g MyResourceGroup --vm-name MyVm --disk disk_name --new

Required Parameters

--disk

Disk name or id.

--resource-group -g

Name of resource group. You can configure the default group using az configure --defaults group=.

--vm-name

The name of the Virtual Machine. You can configure the default using az configure --defaults vm=.

Optional Parameters

--caching

Disk caching policy.

accepted values: None, ReadOnly, ReadWrite
--lun

0-based logical unit number (LUN). Max value depends on the Virtual Machine size.

--new

Create a new disk.

--size-gb -z

Size in GB.

--sku

Underlying storage sku.

accepted values: Premium_LRS, Standard_LRS

az vm disk detach

az vm disk detach --name
--resource-group
--vm-name

Examples

Detach a data disk from a VM.

az vm disk detach -g MyResourceGroup --vm-name MyVm -n disk_name

Required Parameters

--name -n

The data disk name.

--resource-group -g

Name of resource group. You can configure the default group using az configure --defaults group=.

--vm-name

The name of the Virtual Machine. You can configure the default using az configure --defaults vm=.