说明： DRBD是一种块设备，可以被用于高可用(HA)之中。它类似于一个网络RAID-1功能。当你将数据写入本地文件系统时，数据还将会被发送到网络中另 一台主机上。 (DRBD is a block device can be used for high availability (HA) of. It is similar to a network RAID-1 functionality. When you write data to the local file system, the data also will be sent to another network host.)
