Some important JFS2-specific file system performance enhancements include sequential page readahead and sequential and random write behind.
一些重要的、JFS2特定的文件系统的性能增强功能包括，提前顺序页面读取和延迟顺序、随机写入。
2
If you could look into what we call the future, if you could readahead, on yesterday you would have seen yourself reading this article today.
假设你能看见我们所谓的未来，假设你能事先读到，昨天你能看到自己今天在读这篇文章。
3
Further, applications that might benefit from having a file system readahead or high buffer cache hit rates might actually see performance degradation.