写到物理存储设备（步骤 8）的写吞吐量。
The write throughput to the physical storage device (step 8).
正如前面所讨论的，ZFS合并了卷管理功能来提取底层物理存储设备到文件系统。
As discussed earlier, ZFS incorporates a volume-management function to abstract underlying physical storage devices to the file system.
确保NUM_IOCLEANERS数据库配置参数的值至少等于数据库中物理存储设备的数量。
Ensure that the value of the NUM_IOCLEANERS database configuration parameter is set to at least the number of physical storage devices in the database.
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