August 2019
Beginner to intermediate
232 pages
3h 50m
Chinese
Content preview from Web容量规划之美
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135
趋势预测
采购
正如我们演示的那样，利用资源的上限，我们可以预测何时我们需要更多的特定
资源。当我们完成什么时候需要更多资源的预测任务时，我们可以利用该时间表
推断出何时开始采购过程。
采购流程是指你获得新容量的过程，它通常需要花费时间来确认，订购、采购、安装、
测试并部署任何新的容量。图
4-15
说明了采购渠道。
图
4
-
15
：典型的采购流程
图
4-14
中列举的任务随组织的不同而不同。在某些大型企业中，通常需要花费更
长的时间获得采购硬件的审批，但是运输会很快。在一些小型初创公司，审批会
很快，但是安装进行的更慢一些。每种情况都不同，但是面临的挑战都差不多：
估算整个过程将要花费的时间，增加一些可以令人放心的缓存时间以防意外情况
发生。一旦你知道了缓冲时限，就可以向后推算容量规划。
在我们的磁盘存储消耗实例中，我们有当前的磁盘消耗数据，我们估算半个月磁
盘空间会耗尽，你现在知道你有两周时间来确认、订货、收货、安装和部署新的
存储服务器。如果你不知道的话，你的磁盘存储空间将耗尽并被迫以某种方式来
降低存储空间使用量。理想情况下，两周的期限足够你扩容新的在线存储容量。
136
第
4
章
采购时间：关键性度量指标
显然，采购设备的时间和采购什么以及采购数量同样重要。上面列出的采购时限
暗示着你需要注意获取所需要的资源并投入生产需要多长时间 ...
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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.