Amazon EC2 Instance Local Storage | Teradata Vantage on AWS (DIY) - 2.2 - Amazon EC2 Instance Local Storage - Teradata Vantage on AWS

Teradata Vantageā„¢ on AWS (DIY) Installation and Administration Guide

Product
Teradata Vantage on AWS
Release Number
2.2
Release Date
May 2021
Content Type
Administration
Configuration
Installation
Publication ID
B035-2800-041K
Language
English (United States)

Local storage is temporary or ephemeral, but provides better performance compared to EBS. It is ideal for testing and development where you do not need to keep data. The storage is used for the data volume, but the root disk uses 350 GB EBS. A minimal charge occurs at the time you deploy any instance that uses a root disk.

Consider the following when choosing the local storage.

Local Storage Type Considerations
Local (both SSD and HDD)
  • Storage requires a running instance
  • Potential for data loss if instance fails, but data protection is available using Teradata DSC
  • Lower reliability than EBS; HDD is lower reliability than SSD
SSD Only
  • Highest performance
  • Highest cost per vCPU per TB
  • Up to 72 TB of storage per EC2 instance
HDD Only
  • Lower performance than SSD
  • Lower cost per vCPU per TB than SSD
  • Up to 48 TB storage per EC2 instance
Local storage leads to data loss in the following node events:
  • Shutdown (init 0)
  • Node hang
  • Machine check (hardware fault such as a double bit memory error)
  • Stopping the instance through the Amazon EC2 Console
  • Terminating an instance

Data loss does not occur with certain node events, such as a reboot (init 6) or node panic (sometimes referred to as an oops event). An oops event causes a memory dump and then the node is rebooted.

To avoid data loss, deploy a Vantage instance from an EBS-based AMI, or use an automated Teradata backup solution such as Teradata Data Stream Controller.