这是由于在实现 JFS2 时采用了写独占 (write-exclusive) 索引节点锁。这种方式允许多个用户同时读取同一个文件,当多个用户需要读取相同的数据文件时,这能够显著地提高性能。
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Exclusive-Read and Exclusive-Write 不允许同时读和同时写
exclusive write mode 排它写入方式
concurrent-read and exclusive-write 同时读但不允许同时写
This is due to the way in which JFS2 is implemented with a write-exclusive inode lock, allowing multiples users to read the same file simultaneously.
这是因为JFS2在实现时使用了写独占(write - exclusive)索引节点锁,允许多个用户同时读取相同的文件。
Once an exclusive lock has been issued, no other read or write operations can take place.
在发出独占锁定后,其他的读或写操作将不会再发生。
Quiesced Update 0x2 a table space is in this state when the application that invokes the table space quiesce function has exclusive write access to the table space.
Quiesced Update 0x2当调用表空间静默(quiesce)功能的应用程序独占写访问表空间时,该表空间就处于这种状态。
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