AIX - Quorum

The following commands change the quorum for the volume group testvg. This
Attribute determines if the volume group will be varied off or not after losing the
Simple majority of its physical volumes.

To turn off the quorum use the command:

#chvg -Qn testvg

To turn on the quorum use the command:

# chvg -Qy testvg

Quorum is used for data integrity. When we activate quorum in VG it will recover 51% of data in VG

If we have DATAVG, This DATAVG has two PV’s hdisk1, hdisk2.

First PV hdisk1 has 2 * VGDA and 1 *VGSA

Second PV hdisk2 has 1* VGDA and 1*VGSA

Each VGDA has 33% of data, so hdisk1 has 2 VGDA, it will protect 66% of data and Second PV hdisk2 has 1 VGDA, it will protect only 33% data.