ORA-15063: ASM discovered an insufficient

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ORA-15063: ASM discovered an insufficient number of disks for diskgroup"string"
Cause: ASM was unable tofind a sufficient number of disks belonging to the
diskgroup to continue the operation.
Action: Check that the disksin the diskgroup are present and functioning, that
the owner of the ORACLE binary has read/write permission to the disks, and that
the ASM_DISKSTRING initialization parameter has been set correctly. Verify that
ASM discovers the appropriate disks by querying V$ASM_DISK from the ASM
instance.