第二和第三项操作会对Exchange Server本身带来一定的负载,主要是一些密集的磁盘操作。在线碎片整理期间,用户访问邮箱的速度会明显的变慢。当Exchange Server的备份和在线碎片整理的时间发生冲突时,在线碎片整理会被终止并直到备份完成才能得以恢复。关于在线碎片整理的详细细节,请参考微软知识库文档“Understanding Performance and Scalability Characteristics of Exchange 2000 MDB Online Maintenance”,其文档代号为271222。
正常情况下,在线碎片整理会在管理员规定的时间停止,并在事件日志中记下如下的内容
Event: 1221
Source: MSExchangeIS Private
Type: Information
Category: General
Description: The database has nnn megabytes of free space after online defragmentation has terminated.
Note:
It is REQUIRED that you immediately perform a full backup of this database. If you restore a backup made before the defragmentation, the database will be rolled back to the state it was in at the time of that backup.
Operation completed successfully in 13.110 seconds.