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When this :
Returns 0 rows you have nothing to Mount.
select name,path from v$asm_disk;
You have a cause and effect problem.
ORA-015039, ORA-15063: ASM Discovered An Insufficient Number Of Disks For Diskgroup [ID 1478128.1]
Can you check what is the value set for the parameter "asm_diskstring"
Post the outcome of
sql>show parameter asm_diskNormally, if the disks were created using ASMLIB, then check out the location of the ASM disks at the location "/dev/oracleasm/disks" and if the disks are present at this location, then set the parameter "asm_diskstring" to the above path. The default value of this parameter is "ORCL:*"