因为选择安装两个磁盘奇偶校验磁盘，所以有效存储大小将接近于其他三个磁盘的总和。
Because we chose a two disk parity setup, the effective storage size will be close to the total of the other three devices.
关于存储容量方面RAID - 5和RAID - 6更节省，但是它们通常需要额外硬件处理来避免奇偶校验计算加重处理器负荷。
RAID-5 and RAID-6 are more frugal with respect to storage capacity, but they typically require additional hardware processing to avoid burdening the processor with the parity calculations.
RAID - Z 2安装的最低要求是应该配置5个驱动器(两个用于奇偶校验)，剩下三个驱动器全部用于存储。
At a minimum, a RAID-Z2 setup should be configured with five drives total (two used for parity) which will leave three drives to be counted as overall storage.
应用推荐