I'm an oracle noob I have. please forgive any ignorance.

We have to install oracle on aix 7 with a hitachiupv providing storage.
I have learnt that using ASM would be benificial.

My question is around DR currently we use truecopy to replicate the disks to the dr environment the aix instances are in cold standby, and when we bring up dr the AIX admin imports the disks using vio when the disks are presented to the AIX lpar they have different PVID's and therefore different rhdisks numbers.

how does asm know what disks are where if the rhdiks id's are different
do I have to tell asm what to import?

any help would be appreciated.