Automatically mount volume on EC2

You can use diskpart to do this. Open up cmd.exe and run diskpart. This allows you to execute commands. First, run san policy=onlineall. Then, type list disk. Because of the nature of EC2, you should consistently be able to mount the same disk. It appears it should be disk 1. Then, type select disk 1 and online disk.

To script this, make a file called diskpart.txt and add these lines:

san policy=onlineall
select disk 1
online disk

Then you can execute DISKPART /s diskpart.txt to automatically mount the drive.

You could consider changing the disk policy to "OnlineAll":

DISKPART> san policy=OnlineAll