Oracle Solution for Error ora-15289

ORA-15289: ASM disk string cannot be resized beyond string M

What triggered the Error:

A resize disk command specified a size beyond the maximum allowed for this disk.

What should we do to fix it:

Check alert logs from all ASM instances to identify the reason for the size limitation. If there are any 10g database instances using this disk group, shut down those instances and retry the resize operation.