What is Instance store-backed ami in AWS? Detailed Explanation

By CloudDefense.AI Logo

An instance store-backed AMI, in terms of AWS (Amazon Web Services), refers to an Amazon Machine Image that is stored on a local instance store. These AMIs are commonly used in AWS services such as the Amazon Elastic Compute Cloud (EC2).

Instance store-backed AMIs offer several advantages and considerations compared to other types of AMIs. One significant advantage is their boot time. These AMIs are booted faster because the instance store is directly connected to the host computer. Additionally, instance store-backed AMIs offer high input/output performance. Since the instance store is physically attached to the host, it provides low-latency data access, making it ideal for applications that require intense disk I/O operations.

However, it is important to note some considerations when using instance store-backed AMIs. Firstly, they are tied to the lifecycle of the underlying EC2 instance. If the instance terminates or fails, the data stored on the instance store will be lost. Therefore, it is crucial to regularly back up any critical data. Secondly, these AMIs cannot be easily migrated between different EC2 instances or regions. This limitation can impact scalability and flexibility for certain workloads.

In conclusion, instance store-backed AMIs in AWS are a type of AMI that offer fast boot times and high I/O performance, making them ideal for applications with intense disk I/O requirements. However, it is essential to consider the potential loss of data and limited migration capabilities when using instance store-backed AMIs in AWS. By understanding these factors, users can make informed decisions when choosing the appropriate AMI type for their specific use cases.

Some more glossary terms you might be interested in: