Whenever an application commits a transaction, dirty pages are written directly into the PowerHA pureScale server.
每当应用程序提交事务时，脏页被直接写到 PowerHA pureScale 服务器。
This parameter determines the threshold percentage of dirty pages in the buffer pool at which page cleaning will be initiated.
这个参数决定缓冲池中脏页的阈值百分比，当脏页达到这个百分比时，就会启动页清除。
The reason for this is to limit the amount of dirty pages in memory, which further reduces I/O overhead and disk fragmentation.
这么做可以限制内存中 “脏” 页面的数量，从而进一步减少 I/O 开销和磁盘碎片。
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