What is a recommended region size for mirrored lvm volumes

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Issue

What is the recommended region size to use while creating mirror lvm volume of large size?
Does the region size used in creation of mirror lvm volume would have any impact on performance?
How to decide the region size for cluster mirror lvm volume of size up to 20 TB?
Potentially encountering error below:

Unable to convert vg1 to clustered mode: Mirror region size of lv1 is too small.

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
LVM 2

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