quorum

[D.J.:'kwɔ:rəm, 'kwəʊr-]

[K.K.:'kwɔrəm, 'kwor-]

n.

法定人数

a quorum for a meeting

开会的法定人数

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Quorum :

There must be a quorum of VGDAs available to activate the volume group and make it available for use with the varyonvg command. A quorum of VGDA copies is needed to ensure the data integrity of management data that describes the logical and physical volumes in the volume group. A quorum is equal to 51% or more of the VGDAs available.

A system administrator can force a volume group to varyon without a quorum. This is not recommended and should only be done in an emergency.

一个pv时上面有两份vgds/vgsa，所以quorum是2；
四个pv时每个上面有一份，这样51%的pv可用的话，quorum就是3了；

但如果两个pv时，第一个上有两份vgda，第二个有一份vgda，51%的pv可用的时候，quorum应该是二。

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quorum 理解

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