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as disks are shared you just need to partition on one node.Once partition is done, just mark the disks as ASM disks using the asmlib on one node only, on other nodes just scan the disks.
/etc/init.d/oracleasm config --> it will asks for who needs to be owned these disks. /etc/init.d/oracleasm createdisk <diskname> <diskpath/name> ---> create on one node --on remaining nodes use scan /etc/init.d/oracleasm scandisks --finally run following on all nodes and make sure disks are available /etc/init.d/oracleasm listdisks
Oracle recommends for RAC :
1. Use ASMLib for ease of management and for increased performance provided by the ASMLib Async I/O driver.
2. When using ASMLib in a multipath environment ensure that ASMLib has been configured properly such that the multipath device is used for access to the devices.
3. OCFS2 on a RAC system since it adds additional complexity to the cluster. Use of ASM is the current and future direction for storage on a RAC system and is a highly recommended best practice.
4. OCFS2 1.2.7-1 can make the OCFS2 filesystem(s) become unavailable for access after a node panic or a node eviction occurs. Users are advised to upgrade to OCFS2 1.2.8-2 as soon as possible.
Hope it helps....