AWS主机选购 hvm root device ENA选哪个
AWS 看过一个文章说pintrest 用的AWS 一下子增强了月小升得信息，决定变更阿里云到亚马逊云
Root device type: ebs Virtualization type: hvm ENA Enabled: No
Root device type: ebs Virtualization type: paravirtual ENA Enabled: No
Virtualization type: hvm
Virtualization type: paravirtual
HVM: hardware virtual machine 全虚拟
PV: paravirtual 半虚拟
The main difference between PV and HVM AMIs is the way in which they boot and whether or not they can take advantage of special hardware extensions (CPU, network, and storage) for better performance.
半虚拟可以访问机器底层真正得硬件，以获得更高效率
https://docs.aws.amazon.com/zh_cn/AWSEC2/latest/UserGuide/virtualization_types.html
以往，半虚拟化客户机在存储和网络操作方面的性能要优于硬件虚拟机客户机，
注意，以往两个字那是以前 PV性能优于 HVM
现在有了技术的更新
借助这些硬件虚拟机驱动程序上的半虚拟化，硬件虚拟机客户机可以获得与半虚拟化客户机相同甚至更佳的性能。
https://www.opswat.com/blog/aws-2015-why-you-need-switch-pv-hvm
But with changes being made in AWS, all users can and should be considering HVM for their instances.
主要是HVM
https://minops.com/blog/2014/07/paravirtual-vs-hvm-images/
结论，不用纠结，选择HVM AWS的趋势
https://forums.rancher.com/t/hvm-vs-paravirtual-rancher-ami-on-aws/990
I’d suggest using HVM as this looks to be the VM technology AWS is migrating to.
Instance store vs EBS
https://aws.amazon.com/premiumsupport/knowledge-center/instance-store-vs-ebs/
Amazon Elastic Block Store (Amazon EBS) volume
Instance store 临时实例，重启后数据丢失
EBS 可以扩展的，持久存留数据的
ENA Enabled: Yes
对于支持的实例类型，Elastic Network Adapter (ENA) 最多支持 25 Gbps 的网络速度。
C5, C5d, F1, G3, H1, I3, m4.16xlarge, M5, M5d, P2, P3, R4, R5, R5d, X1, X1e, and z1d 实例使用 Elastic Network Adapter 实现增强联网。
Tenancy Dedicated Host or instances
https://aws.amazon.com/ec2/purchasing-options/dedicated-instances/
选择 Shared 资金充足随便 专用主机肯定更牛，不过价格月小升看来，不是土豪，别随便用。
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