Moving ASM-based RAC to new storage device

We recently installed Oracle 11gR2 RAC on a REH 5.3 cluster. CRS, Voting Disk, and database files are all sitting on an ASM disk group (on a Clarion storage device). A decision is made to move everything to a new storage device (DMX). We are using EMC powerpath.
Is there an easy way to move this Oracle cluster from one storage device to another.
We can rsync the grid and RDBMS binaries which are installed on a linux filesystem on each node but I would like to know how to go about moving the shared storage which is hosted on the ASM.
We used asmlib 2.0 to create the ASM disk and then relied on the clusterware installer and DBCA to create the disk group, the cluster components, and the oracle database.
Do I need to backup the ASM database as well as our RAC database (using RMAN) into a flat filesystem first and restore them once the new ASM disk is created in the new storage device?
A step by step procedure will be greatly appreciated.
Thanks,
Omer

Yes its possible without backup/restore.. good to take full back in case of any mishappening.
Please read metalink note for step by step process..
Exact Steps To Migrate ASM Diskgroups To Another SAN Without Downtime. [ID 837308.1]
Regards
Rajesh

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Moving ASM-based RAC to new storage device

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