Supported Storage Types

Storage types determine where your data will be saved and how fast it can be retrieved. The following storage types are supported for clusters:

  • Ephemeral storage : ephemeral storage provides you with lower latency than EBS volumes at the cost of persistence. Any data saved on ephemeral storage will be lost when the instance is terminated.
    • Magnetic disk
      • This disks offer lower latency and higher throughput than EBS
      • This type of storage is limited to older instance types such as C1, M1, and M2
    • Solid-state drive (SSD)
      • These disks offer the highest performance and lowest latency
      • This type of storage is limited to certain instance types, such as C3, M3, R3, and Hi1
      • There is a limit on the number of High I/O instances you may have in a given environment. Please contact Engine Yard Support to have your limit increased if you experience provisioning errors.

Volume Size

Engine Yard platform will provision storage volumes for various devices when an AWS EC2 instance is launched by a customer. The default volume size and storage type are specified in the following table :

Device Mount Device type Size (G)
sda/xvda / EBS, gp2 30
sdb/xvdb /mnt EBS, gp2 Note*
sdc/xvdc swap  EBS, gp2 
sdd/xvdd none  ephemeral  varies by instance size
sde/xvde  none  ephemeral varies by instance size
sdn/xvdn /data  EBS user specified 
sdm/xvdm  /db  EBS  user specified 

*Note: Previously the default volume size for "/mnt" was 100G. However, the sizing rule has been changed as shown below (this rule only applies to newly provisioned instances, old instances are not affected) :

  • Application instance : 25G
  • Database instance : 50G or the maximum size of database specified by the customer, which ever is larger
  • Load balance or utility instance : 25G