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I know pvcreate a LVM physical volume usually on a LVM partition, but I do a pvcreate on a empty ext3 partition accidentally, is this dangerous, do I really need to repartition with LVM format on the target disk?

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It should be fine. I'm pretty sure the "format" you would select in fdisk is really nothing more than a label.

With that said, changing a partition type is an easy process. You only need to use fdisk's 't' command. The type for LVM is '8e'.

Nicholas
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  • Some OSes care about partition types, but Linux doesn't (it only looks for signatures inside the partitions) except for extended partitions (i.e. containers for logical partitions). – Gilles 'SO- stop being evil' Apr 04 '11 at 20:40