Disk Storage Need to Add more Disk

Hi,

Anyone can help me, just want to confirm, if possible adding a disk storage that we have a RAWDATA with +ASM in our database. If possible, what would you recommend "workaround used" from us to do and the preparation. And also how long the downtime will take.

Our disk continuous to grow, need to add more disk storage in our "Sun StorageTek 3510 FC Array".

Storage having the following above;

Database : Oracle10g release 10.2.0.3
OS : SUN Solaris 10
Number of Nodes and Oracle SID Mapping : 2 instances "db01 and db02" using rawdata with +asm

Thanks in Advance;
FP