In a storage area, a LUN often represents a SCSI disk on which a host can perform a read and write operation.
在存储区域中，LUN通常表示一个主机能够执行读写操作的SCSI磁盘。
Thus, the read operations compete with log writing and the write operation for data pages from the buffer pool.
因而，读操作与日志写和缓冲池中的数据页的写操作之间存在竞争。
The initialization of the split mirror as snapshot performs a crash recovery, rolls back all uncommitted transactions, and makes the database available for any read or write operation.
将分割镜像初始化为快照时，将执行崩溃恢复，回滚所有未提交的事务，并使数据库可以被所有读或写操作访问。
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