Engine Yard Developer Center

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 standard on newer instance types, such as 3rd, 4th and 5th generation instances

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 user specified*
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 size is now a customizable option when creating instances.


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