Azure local drive - where did it go? (Linux VM)

Question

Azure VM Table ...

https://www.windowsazure.com/en-us/pricing/details/#header-2

... says that, for example, the average instance comes with 490 GB of local storage. Therefore, I expected a regular 30GB Azure BLOB OS drive, and then 490GB / mnt / resource.

But no:

$ df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 28G 1.7G 25G 7% / tmpfs 1.7G 0 1.7G 0% /dev/shm /dev/sda1 485M 68M 392M 15% /boot /dev/sdb1 133G 188M 126G 1% /mnt/resource 

This is a CentOS image, but it is the same for other images.

Am I missing something? I do not see space in the volume group or anything else, and there are no sd * devices that are not installed.

Answer 1

Neil Mackenzie's answer in the comments seems correct

All Windows Azure IaaS virtual machines come with two disks - the OS disk supported by VHD was stored in Windows Azure Blob storage and a temporary disk physically attached to the hosting server. This temporary disk is truly ephemeral and any content on it will be lost if the virtual machine is deleted (shutting down the portal or API) or moved to heal the server. For Linux virtual machines, this is a temporary drive / dev / sdb.

I found this link for confirmation: http://blogs.msdn.com/b/wats/archive/2013/12/07/understanding-the-temporary-drive-on-windows-azure-virtual-machines.aspx