[server] mount existing btrfs file system after OS reinstall

So I just had to replace the HD in my media server as it had exceeded it's life expectancy by a number of years and finally failed. I've since reinstalled the OS (Ubuntu Server 14.04 LTS) and need to remount the btrfs file system that exists on the other drives.

I've searched the great Oracle (google) and have found mostly how to set it up, not how to reintegrate an existing array after an OS reinstall.

Can anyone help or point in the right direction?

Thanks!