How to use my disk storage for a Database instance on VM?

Hello, and thank you in advance for your help!

I'm trying to create ubuntu VM server for hosting a database.

I created A4 (Extra Large) instance, and installed the database and it works.

the problem is, that my default disk has only 29 GB of storage:

azureuser@couchpoc:/var/log$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1        29G   19G  9.0G  68% /
udev            6.9G   12K  6.9G   1% /dev
tmpfs           1.4G  260K  1.4G   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            6.9G     0  6.9G   0% /run/shm
/dev/sdb1       237G  188M  225G   1% /mnt
/dev/sdc1        99G  188M   94G   1% /couchdrive

How can i use my full storage capacity? according to the pricing page, i suppose to have 127 disk GB and not just 29 GB:

http://msdn.microsoft.com/library/azure/dn197896.aspx

Also, is it possible to attach a SSD disk, which is more suitable for Database?

And last question: is using an attached disk ("data disk" attached from the management console) considered good just as the default disk ("os disk") for a thing such as DB?

Thanks a lot!