![]() "incremental" snapshots - the snapshots are only logical containers of pointers to the backed-up data blocks, so they are in essence, all "full" snapshots, but only billed as incrememental. ![]() but through some excellent witchcraft, you also don't have to keep track of "full" vs. EBS supports point-in-time snapshots, and these are incremental at the block level, so you don't pay for storing the data that didn't change across snapshots. Reserved and dedicated instances don't change ephemeral disk behavior.ĮBS is persistent, redundant storage, that can be detached from one instance and moved to another (and this happens automatically across a stop/start). If your instance suffers a hardware failure, or is scheduled for retirement, as eventually happens to all hardware, you will have to stop and start the instance to move it to new hardware. It survives hard and soft reboots, but not stop/start cycles. The Instance Store is local, so it's quite fast. Ubuntu 14.04 NVMe support is not really stable and not recommended.Įach of these three storage solutions has its advantages and disadvantages. My impression has been that eventually it should succeed.īut, you may need to apt-get install linux-aws if running Ubuntu 16.04. It isn't clear why your instances are failing to boot, but nofail may not be doing what you expect when a volume is present but has no filesystem. hence, "ephemeral." Persistent data needs to be on an Elastic Block Store (EBS) volume or an Elastic File System (EFS), both of which survive instance stop/start, hardware failures, and maintenance. They are physically inside the instance and extremely fast, but not redundant and not intended for persistent data. The NVMe SSD on the i3 instance class is an example of an Instance Store Volume, also known as an Ephemeral. If grep doesn't find a match, it returns false. One way of testing whether a filesystem is already present is using the file utility and grep its output. So, the best approach, if you are going to be stopping and starting instances is not to add them to /etc/fstab but rather to just format them on first boot and mount them after that. ![]() When an instance is stopped, it doesn't exist on any physical host - the resources are freed. so the ephemeral disks will always be blank after stop/start. ![]() Stopping and starting an instance erases the ephemeral disks, moves the instance to new host hardware, and gives you new empty disks. ![]()
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