you are replicating your data, these can be a good solution for high performance/low latency requirements. If you can afford to lose an instance, i.e. This is a good option when you need storage with very low latency, but you don’t need the data to persist when the instance terminates, or you can take advantage of fault-tolerant architectures.ĮXAM TIP: Instance stores offer very high performance and low latency. Some instance types use NVMe or SATA-based solid-state drives (SSD) to deliver high random I/O performance. Instance store volumes are included as part of the instance’s usage cost. The instance type determines the size of the instance store available, and the type of hardware used for the instance store volumes. You can’t detach an instance store volume from one instance and attach it to a different instance. You can specify instance store volumes for an instance only when you launch it. Instance store is ideal for temporary storage of information that changes frequently, such as buffers, caches, scratch data, and other temporary content, or for data that is replicated across a fleet of instances, such as a load-balanced pool of web servers.
Instance store storage is located on disks that are physically attached to the host computer. This is different to EBS which provides persistent storage but is also a block storage service that can be a root or additional volume. You can have up to 10,000 snapshots by default.Īn instance store provides temporary (non-persistent) block-level storage for your instance. You can have up to 5,000 EBS volumes by default. Images can be made public but not if they’re encrypted. When changing volumes the new volume must be at least the size of the current volume’s snapshot.
You can also attach additional EBS volumes to a running instance. You can use block device mapping to specify additional EBS volumes or instance store volumes to attach to an instance when it’s launched. Throughput optimized EBS volumes cannot be a boot volume.Įach instance that you launch has an associated root device volume, either an Amazon EBS volume or an instance store volume. Magnetic EBS is for workloads that need throughput rather than IOPS. The root device is created under /dev/sda1 or /dev/xvda. To migrate volumes between AZ’s create a snapshot then create a volume in another AZ from the snapshot (possible to change size and type).Īuto-enable IO setting prevents the stopping of IO to a disk when AWS detects inconsistencies. Volume sizes and types can be upgraded without downtime (except for magnetic standard).Įlastic Volumes allow you to increase volume size, adjust performance, or change the volume type while the volume is in use. You can now create AMIs with encrypted root/boot volumes as well as data volumes (you can also use separate CMKs per volume). The behavior can be changed by altering the “DeleteOnTermination” attribute. Root EBS volumes are deleted on termination by default.Įxtra non-boot volumes are not deleted on termination by default. Termination protection is turned off by default and must be manually enabled (keeps the volume/data when the instance is terminated). You can attach an EBS volume to multiple instances with specific constraints.įor most use cases where you need a shared volume across EC2 instances use Amazon EFS.ĮBS volume data is replicated across multiple servers in an AZ.ĮBS volumes must be in the same AZ as the instances they are attached to.ĮBS is designed for an annual failure rate of 0.1%-0.2% & an SLA of 99.95%. You can attach multiple EBS volumes to an instance. You'll gain access to our entire library of on-demand training courses - current and future - for the next 12 months.ĮBS volumes are network attached storage that can be attached to EC2 instances.ĮBS volume data persists independently of the life of the instance.ĮBS volumes do not need to be attached to an instance. Take advantage of our SPECIAL OFFER and save 25% on our Annual Membership!
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