1. lvdisplay -k -v /dev/vg_name - gives pvkey
 2. lvreduce -k pv_key_number -m 0 /dev/vg_name - this will remove the mirror LV
 3. May now need to remove the faulty disk from the volume group
       1. vgreduce -f /dev/vg_name
       2. mv /etc/lvmtab /etc/lvmtab.old
       3. vgscan -v
       4. vgcfgbackup /dev/vg_name

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