March 2023
Beginner to intermediate
266 pages
4h 30m
Chinese
Content preview from FinOps云成本优化
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AWS
｜
135
转换和取消
最近在预留中新增了转换或交换预留资源给另一种资源类型的功能。可兑换预留类型通
常能提供比不能兑换的预留类型更低的折扣率。转换预留类型的能力降低了最终获得的
与你的资源不匹配的预留类型风险。如果资源被更新导致它们不再匹配，你可以将预留
类型转换成匹配的预留资源。交换或转换预留的能力通常局限于最初购买预留的地区。
通常，你所进行的转换资源规格必须相等或更大。因此，如果减少对云服务提供商的使用，
你将无法交换预留资源，因为这样做会减少整体承诺的资源使用量。除了转换外，一些
云服务提供商（如
Azure
）提供取消某些预留的功能，而这通常是收费的。
三巨头提供的使用承诺概述
让我们来看看三大云计算供应商，以及他们的产品在表
13-1
中的比较。
表13-1 比较三大云服务提供商的预订服务
AWS Google Azure
程序名 预留实例
/
节省计划 承诺使用折扣 预留
VM
实例
支付模型 全部预付，部分预付，不预付 不预付 全部预付
租约 一年或三年 一年或三年 一年或三年
实例尺寸灵活性 是 无 是
转换或交换 标准，不可转换，支持 无 支持
可取消性 不支持，但预留实例可以通过市场
售卖
无 支持，以年为
期限
持续使用折扣 无 支持 无
你可以看到，三大云服务提供商提供的服务非常相似，具有相同的期限长度和规模灵活
性。折扣产品的不同在很大程度上取决于它们应用预留的特定方法和云资源折扣的计费
方法。
AWS
AWS
早在
2009
年就率先提供了预留实例。因此，他们拥有迄今为止最复杂的预留程序。
然而，这也意味着
AW
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.