![]() But If you do know, please explain it by leaving a comment below. Storage Options for creating an AMI image from an existing EC2 Instance Ephemeral Storage Options for the g2.8xlarge EC2 instanceĭon’t ask me why it’s all set up this way. And if you create a new AMI image from a launched EC2 instance, then you can attach as many Instance store volumes as are available (24 total). And for the g2.8xlarge, it allows you to add TWO additional instance stores. For example, if you try to launch a t2.micro EC2, or even most of the other instance types, you will not be able to attach ephemeral storage.īut if you launch the m3.medium EC2, then you are able to add ONE instance store. It’s actually pretty tricky to figure out where you can actually use ephemeral storage when launching EC2 instances. EBS is is the DeFacto standard when launching an EC2 instance. I was surprised to see this storage option besides EBS, because EBS is the default. are some possible use cases for instance store. Things like Buffer, Cache, in Raid Arrays, or Temporary Backups. The AWS Documentation mentions that Amazon Instance Store is designed for temporary storage for EC2. Unable to stop the EC2 once it starts running.Ĭan attach as many EBS volumes to an EC2 as is desired.Ĭannot only attach a max of ONE additional Instance Store to the EC2 Only Option is TerminateĪble to both start and stop EBS backed EC2 instances Unable to Restart the Instance once running. Provisioned from templates stored in Amazon S3Ĭan be attached/deattach/reattached to an EC2 instanceĬannot be detached/reattached to an EC2 instance Provisioned from Snapshots created from Elastic Block Storage The DeFacto standard Storage Option for EC2Ī legacy option that's still available for EC2 storage. There are several differences between EBS and Ephemeral Storage that may be worth understanding for us as Cloud Engineers. Instance Store was first used by Amazon, until they shifted to Elastic Block Store. There’s another type, known as Instance Store, or Ephemeral Storage. But this isn’t the only type of storage that is available. For safety the script will not write any data to any /dev/ device if it has an existing partition table.EC2 Instances primarily utilize storage known as EBS Volumes. This script will format the instance store on boot and enable swap, by default it formats /dev/xvdb which shouldn’t contain data on boot as ephemeral storage (what the instance store sites on top of) is wiped on shutdown. You could use this script with a second EBS volume on the T1 and T2 instances for swap to give that buffer for the small amount of memory provided (Make sure you use the EBS SSD backed storage otherwise you will be charged per million I/O’s). T1 and T2 instances don’t have instance stores or special Swap instance stores. Special swap instance stores are provided with m1.small and m1.medium instances (usually /dev/xvdb3) and mounted automatically (Unless you upgrade from a micro but that is another issue I’ll cover in another post). I created this script so that I could utilise the free instance store provided with my EC2 instance as swap.
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