![]() Not all instance types support instance store volumes. They are also commonly used for service within a load balancing group, where data is replicated across the fleet such as a web server pool. Instance store volumes are generally used for data that is frequently changing that doesn't need to be retained, as such, they are great to be used as a cache or buffer. ![]() However, any persistent data required would need to be replicate or copied to a persistent data store in this scenario. With speeds like this, it makes it ideal to handle the high demands of no SQL databases. When using store optimized instance families, such as the I3 Family, it's potentially possible to reach 3.3 million random read IOPS, and 1.4 million write IOPS. The I/O speed on these volumes can far exceed those provided by the alternative instance block storage, EBS for example. So, you don't have an additional spend on storage cost. So, you might be thinking, why use these volumes? What use do they have if there is a chance that you are going to lose data? They do, in fact, have several benefits.įrom a cost perspective, the storage used is included in the price of the EC2 instance. When a stop and start, or termination occurs, all the blocks on the storage volume are reset, essentially wiping data. Now all your data on these volumes is lost. You had no warning that this failure was going to occur, and as a result of this failure, the instance was stopped or terminated. ![]() Let's consider you had critical data stored on an ephemeral instance store volume and then the underlying host that provided your EC2 instance and storage failed. ![]() Sometimes this control is not always possible. However, if your instance was simply rebooted, your data would remain intact. Although, you can control when your instances are stopped or terminated, giving you the opportunity to either back-up the data or move it to another persistent volume store, such as the elastic block store service. If your instance is either stopped or terminated, then any data that you have stored on that instance store volume associated with this instance will be deleted without any means of data recovery. By an event, let me explain under what conditions that your data would be lost, should it be stored on one of these volumes. It is not recommended to store critical or valuable data on these ephemeral instance store volumes, as it could be lost, should an event occur. Any data stored on these volumes is considered temporary. But instance store volumes provide ephemeral storage for you EC2 instances.Įphemeral storage means that the block level storage that it provides offers no means of persistency. Up until now within this course we have discussed persistent storage options. The first point to make about EC2 instance store volumes, that the volumes physically reside on the same host that provides your EC2 instance itself, acting as local disc drives, allowing you to store data locally to that instance. ![]() Hello, and welcome to this lecture covering EC2 Instance Level Storage which is referred as an instance store volume. ![]()
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