AWS: Dedicated Host VS Dedicated Instance, why the first is more expensive than the later?
Oct 11
I'm studying for my Associate Architect exam at AWS, and I can't find an explanation for this question. Why Dedicated Host are more expensive than Dedicated Instances? I understand the main differences between the two, it is just that in my brain it doesn't make sense.
This is my perspective: if you ask for a dedicated host, you control the entire hardware. CPUs, RAM, Sockets, etc. You can use your own license (BYOL). But if you ask for a Dedicated Instance, the hardware it is still just for you. Your AWS account is still the only one using that hardware. You have less control over it, but even though you are locking down a single piece of hardware just for your purposes.
So, why dedicated hosts are more expensive than dedicated instances, if after all, in either case, you "own" the hardware? Again, in either case, AWS won't be able to use that hardware for something else.
1 answer
Accepted answer · original discussion
Oct 11
you are locking down a single piece of hardware just for your purposes.
Dedicated Instance does not work like this. Your instance runs on some dedicated hardware. Its not lockdown to you. If you stop/start instance, you can get some other hardware somewhere else. Basically, the hardware is "yours" (you are not sharing it with others) for the time your instance is running. You stop/start it, you may get different physical machine later on (maybe older, maybe newer, maybe its specs will be a bit different), and so on. So your instance is moved around on different physical servers - whichever is not occupied by others at the time.
With Dedicated Host the physical server is basically yours. It does not change, it's always the same physical machine for as long as you are paying.
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