ASM Unable to Recognize New Devices if Existing Disk Search String does not include them ORA-15014 (Doc ID 1394423.1)

ASM instance is up and running with diskgroup mounted using devices in search string /dev/hdb*

adding disk slice from another disk slice like /dev/hdc  to mounted Diskgroup gives error

ORA-2097 and ORA-15014

[oracle@dclnx64 ~]$ oerr ora 2097
02097, 00000, "parameter cannot be modified because specified value is invalid"
// *Cause: Though the initialization parameter is modifiable, the modified
// value is not acceptable to the parameter.
// *Action: Check the DBA guide for range of acceptable values for this
// parameter.
[oracle@dclnx64 ~]$ oerr ora 15014
15014, 00000, "path '%s' is not in the discovery set"
// *Cause: The operating system path specified was outside the set of disks
// that are discovered by the instance.
// *Action: Specify a operating system path within the set of disks that are
// discovered based upon the ASM_DISKSTRING parameter. Alternatively,
// check the setting of the ASM_DISKSTRING parameter.

Cause

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