看了一下这个测试,由于并没有给出测试软件Anvil's Storage Utilities寿命测试的配置文件,因此无法判断测试数据的写入模型,随机数据占多少比例呢? 也无法判断测试过程中有没有让ssd休息做GC,这些都是是影响写入放大的,他们给出的写入数据是从Anvil's Storage Utilities和SMART中的F1值取得的,是操作系统的写入量,而不是SSD内部的实际写入量,实际上840和840Pro的nand写入量可以从SMART数据中的B1值取得,B1值表示全盘擦写次数,这个值从470系列的SSD开始就有了,从以下这段话可以看出,他们连如何从840和840Pro的SMART数据中取出代表全盘擦写次数的B1值都不会: http://techreport.com/review/25320/the-ssd-endurance-experiment-22tb-update
We can compare those totals to the host write tallies in order to get a sense of write amplification. Both HyperX drives report 21.6TB of host writes, resulting in write amplification factors of 1.05 for the incompressible data and 0.72 for compressible data. The Intel 335 Series registers 22.9TB of total NAND writes on 21.6TB of host writes, closely matching the write amplification of its HyperX counterpart. Unfortunately, the other SSDs don't track NAND writes in addition to host writes, preventing us from calculating their write amplification factors.