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iStorage Server快照功能的简单介绍

iStorage Server快照功能的简单介绍


快照是系统某个特定时刻的一种状态,是系统状态的真事复制。快照功能尤其应用在HA群集中,因为群集是不允许服务罢工的。为了避免宕机,HA系统可能顶替对快照执行备份,只及时读冻结在一个时间点的数据副本--允许程序继续写他们的数据。换句话说,创建快照的时间不会随着数据的大小而增长,然而直接备份所需时间是与数据大小成比例的。在系统中,初始快照建立后,随后的快照只复制变化的数据,使用时都会依据初始快照恢复。这种方法能够节省磁盘空间。

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