而 直接 I/O 可以避免使用文件系统缓冲区，因而对于磁盘的读写更为高效。
Direct I/O bypasses the use of the file system buffers, and therefore is more efficient for reads and writes that go to disk.
不幸的是，如果您没有认真地进行NFS优化，那么您的网络文件系统就可能无法高效地工作。
Unfortunately, if you don't pay attention to NFS tuning, you might have a poorly performing Network File System.
象reiserfs一样，XFS使用逻辑日志；即，它不象ext3那样将文字文件系统块记录到日志，而是使用一种高效的磁盘格式来记录元数据的变动。
Like ReiserFS, XFS USES a logical journal; that is, it does not journal literal filesystem blocks like ext3, and instead USES an efficient on-disk format to log metadata changes.
应用推荐