1·Prior to POWER7, there was a third variation of this technology, utilizing a switchable storage tower on an HSL loop, but that option is no longer available on POWER7 hardware.
在 POWER7 之前，存在这种技术的第三种变体，就是在 HSL 循环上使用一个可切换的存储塔，但是 POWER7 硬件已经不再提供此选项了。