如果vg中仅包含2个pv(如:hdisk0,hdisk1),且1个pv是另1个pv的镜像,称为单镜像(single mirroring),那么QUORUM是不需要的,请执行该命令关闭它.
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To prevent a single point of failure for offline archive logs such as media failure, log mirroring shouldl be used.
要防止脱机归档日志的单点故障，比如媒介失败，则应该使用日志镜像。
Logical volumes (LVs) point to a set of specific PPs; a single LV can point to up to three PPs for mirroring through the logical partitions (LPs) mapping.
逻辑卷(LV)指向一组特定的PP；一个LV最多可以指向三个PP，从而支持通过逻辑分区(LP)映射进行镜像。
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