Which EBS volume type is best for high performance NoSQ…

Which EBS volume type is best for high performance NoSQL cluster deployments?

A.
io1

B.
gp1

C.
standard

D.
gp2

Explanation:
io1 volumes, or Provisioned IOPS (PIOPS) SSDs, are best for: Critical business applications that require sustained IOPS
performance, or more than 10,000 IOPS or 160 MiB/s of throughput per volume, like large database workloads, such as
MongoDB.
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSVolumeTypes.html