Data disappears when you add LUNs to a volume group
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Data on the LUN disappears, when you add an existing LUN to a volume group.
If you add an existing LUN to a volume group that is managed by the LVM, and then execute a
pvcreate command, the data is overwritten.
If you need data that is on an existing LUN, you must migrate that data to a LUN that you create using the LVM. Complete the following steps.
Create new LUNs.
Place the LUNs under LVM control by using the
vgcreate, and the
Copy data from the existing LUNs to the LUNs you created and placed under LVM control.