The High Storage Eight Extra Large (hs1.8xlarge) instances are a great fit for applications that require high storage depth and high sequential I/O performance. Each instance includes 117 GiB of RAM, 16 virtual cores (providing 35 ECU of compute performance), and 48 TB of instance storage across 24 hard disk drives capable of delivering up to 2.4 GB per second of I/O performance.
This is local storage or ephemeral storage so from the perspective of data storages it should be used only with redundant highly available databases (e.g. Riak).
P.S.: I get the feeling Jeff Darcy will be happy reading this post.
Original title and link: The New EC2 High Storage Instance Family ( ©myNoSQL)