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You don't need to re-create disk groups.
The ASM disks has the HEADER mark for ASM already. You'll not recreate them. However, why dont use ASMLIB?
ASMLIB is a licensed version in RHEL6.so we want to use udev to aviod that.
You no need to re-create the ASM disks. ASMLIB is not exactly license factor for Redhat Linux. The Reason is below..
For RHEL 6, Oracle will provide ASMLib software and updates only when configured with a kernel distributed by Oracle. Oracle will not provide ASMLib packages for kernels distributed by Red Hat as part of RHEL 6. ASMLib updates will be delivered via Unbreakable Linux Network (ULN), which is available to customers with Oracle Linux support. ULN works with both Oracle Linux or Red Hat Linux installations, but ASMLib usage will require replacing any Red Hat kernel with a kernel provided by Oracle.