When installing Oracle Grid Infrastructure, any nonclustered Oracle ASM instances are automatically converted to clustered Oracle ASM.
See Also:
Oracle Database 2 Day + Real Application Clusters Guide for information about using Oracle Enterprise Manager Cloud Control to convert nonclustered Oracle ASM to clustered Oracle ASM
Oracle Automatic Storage Management Administrator's Guide for complete information about configuring preferred mirror read disks in extended distance clusters
Oracle Real Application Clusters Installation Guide for your platform for detailed information about converting Oracle ASM using the rconfig command