Azure disk size too small. Linux basic A0 only 29GB - azure

Question

I have just created a linux (Ubuntu 14.4) virtual machine in Azure (SE Asia)
Issue: I only have 29GB not 127GB
It is a Basic Tier, A0 (smallest size)
The advertised disk drive size is 127GB (+20GB tmp)
http://msdn.microsoft.com/en-us/library/azure/dn197896.aspx
I find (after running out of disk space) that I only have around 29GB.
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 29G 24G 4.1G 86% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 323M 12K 323M 1% /dev
tmpfs 68M 388K 67M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 336M 0 336M 0% /run/shm
none 100M 0 100M 0% /run/user
/dev/sdb1 20G 4.3G 15G 23% /mnt
Running cfdisk shows there is no other free space on the drive.
I can't find any documentation to suggest why only 29GB.
Is this a bug/issue/problem with my VM?
Or is it something to do with linux/ubuntu 14.4/basic tier A0 ?

Answer 1

The VM's operating system drive is backed by a blob in your Azure storage account. The blob is a VHD file. When you created the VM, the appropriate VHD was copied from the gallery into your storage account.
The gallery-provided VHD file has a logical capacity of 30GB by design. The documentation states that the maximum allowed size is 127GB, but that is incidental - the gallery images are 30GB.
The solution is two steps, resize the VHD itself (and corresponding blob), then use Linux tooling to resize the partition. This may help:
Resizing a Windows Azure virtual disk

Answer 2

It's now possible to resize via the Azure UI.
That being said, after resizing, the Ubuntu VM will not see the new size by default, you will see that cfdisk sees the unallocated space, and to do it I would use fdisk like it's explained in this answer.

Answer 3

You need to execute follow Azure PowerShell command:
Update-AzureDisk –DiskName "<Disk name>" -Label "ResiZedOS" -ResizedSizeInGB <Size in GB>
Example:
Update-AzureDisk –DiskName "dimitar-linux-dimitar-linux-os" -Label "ResiZedOS" -ResizedSizeInGB 524
Note: Maximum size is 1023 GB.
Note 2: Virtual machine should be power off.
Documentation:
How to install and configure Azure PowerShell
Update-AzureVM
Update-AzureDisk
Question: How to get disk name ?
Answer: You can use azure cli or azure portal.
azure-cli command:
azure vm disk list <virtual machine name> # In my case: azure vm disk list dimitar-centos

Answer 4

As mentioned in Eron Wright's answer, the disk's size is determined from the Gallery image.
To resize the disk via the Azure Portal web UI:
Shut down (deallocate) the VM.
Open the VM blade and click Disks
Select the OS disk. For me, the size of the disk was blank.
Enter a new Size and click Save.
I tested this with an Standard_D2_V2 sized Ubuntu VM. Once I resized the disk and started the VM, I could access the full size of the disk.

Answer 5

The answer by #danailov work brilliantly for me (Azure Linux VM resized correctly)
Just to add this bit that might help somebody; here is how I found out my disk name via Azure Powershell;
Get-AzureDisk | Get-AzureDisk | Format-list DiskName, AttachedTo, DiskSizeInGB, OS > c:\files\disks.txt
The above command will output a text file at the stated location in your local pc with following details for each disks/VMs in your Azure account - DiskName, AttachedTo, DiskSizeInGB and OS the VM is running.